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Contents
- The climate of Heidelberg
- The best time to visit Heidelberg
- The worst time to visit Heidelberg
- Spring weather in Heidelberg
- Summer weather in Heidelberg
- Autumn weather in Heidelberg
- Winter weather in Heidelberg
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
The climate of Heidelberg
Heidelberg, Germany, experiences a predominant Cfb climate according to the Köppen climate classification. This marine west coast, warm summer climate is noticeable due to the city's geographical position in southwestern Germany, located approximately 78 kilometers south of Frankfurt. The climate throughout the year is generally mild, without extreme heat or cold and with regular precipitation.
Moving from temperature highs in the range of 4°C (39.2°F) in January to 25.8°C (78.4°F) in August, the city exhibits a relatively high degree of seasonal variation. Conversely, the lows follow a similar pattern, falling from 15.3°C (59.5°F) in August to -0.3°C (31.5°F) in January. Heidelberg experiences a notable change in humidity levels across the year, with a shift from 86% in January to 67% in July and August.
Rainfall tends to fluctuate relatively equally throughout the year, reaching highs in May with 50mm (1.97"), and featuring low rainfall during the month of April with just 19mm (0.75"). A similar pattern is seen in the number of rainy days, which peak in May (15.8 days) and dip to its lowest in April (11.4 days). In terms of snowy days, the highest counts are seen in January with 5.4 days, while from April to October no snowfall is typically observed.
The presence of sunlight clearly varies throughout the year, where daylight hours move from 8.7 hours in January to 16.2 hours in June. Given the advances and retreats of the sun, the UV index fluctuates from a low 2 in the winter months to a peak of 5 between May and August.
Moving from temperature highs in the range of 4°C (39.2°F) in January to 25.8°C (78.4°F) in August, the city exhibits a relatively high degree of seasonal variation. Conversely, the lows follow a similar pattern, falling from 15.3°C (59.5°F) in August to -0.3°C (31.5°F) in January. Heidelberg experiences a notable change in humidity levels across the year, with a shift from 86% in January to 67% in July and August.
Rainfall tends to fluctuate relatively equally throughout the year, reaching highs in May with 50mm (1.97"), and featuring low rainfall during the month of April with just 19mm (0.75"). A similar pattern is seen in the number of rainy days, which peak in May (15.8 days) and dip to its lowest in April (11.4 days). In terms of snowy days, the highest counts are seen in January with 5.4 days, while from April to October no snowfall is typically observed.
The presence of sunlight clearly varies throughout the year, where daylight hours move from 8.7 hours in January to 16.2 hours in June. Given the advances and retreats of the sun, the UV index fluctuates from a low 2 in the winter months to a peak of 5 between May and August.
The best time to visit Heidelberg
Given its temperate conditions and plentiful rainfall, the most favorable time to visit Heidelberg would be from May to August. During these months, the city enjoys its warmest temperatures, with highs typically ranging from 19.3°C (66.7°F) to 25.8°C (78.4°F). Accompanying this, daylight is at its peak, providing ample time for sightseeing and outdoor activities. Although rainfall is quite frequent during this period, with an average of 15 to 16 rainy days per month, the climatic charm of Heidelberg is not lessened.
The worst time to visit Heidelberg
Conversely, the worst time to visit tends to be in the colder months from November to February when temperatures dip to between -0.3°C (31.5°F) and 5.6°C (42.1°F). Although there can be balmy days, winter's icy grip is normally felt and the daylight hours decrease significantly, dropping to around 8.3 hours in December. In addition, these months see the maximum snowfall in Heidelberg, peaking at 44mm (1.73") in December which can disrupt travel and outdoor activities.
Spring weather in Heidelberg
In Heidelberg, Springtime runs from March until May. During this period, temperatures consistently rise, moving from 10.8°C (51.4°F) in March up to 19.3°C (66.7°F) in May. However, night temperatures still remain relatively low at this time, ranging anywhere from 2.8°C (37°F) to 8.8°C (47.8°F). Spring also sees a reduction in humidity, dropping from 75% in March to 73% in May. Rainfall during this season progressively increases with 30mm (1.18") in March, peaking at 50mm (1.97") in May.
Summer weather in Heidelberg
Summers in Heidelberg extend from June to August, and this is when the city experiences it warmest and sunniest weather. Temperature highs can reach up to 25.8°C (78.4°F) in August, while lows fluctuate between 12.7°C (54.9°F) to 15.3°C (59.5°F). Despite being the sunniest time, there is a fair amount of rainfall too, with precipitation levels ranging from 41mm (1.61") to 46mm (1.81").
Autumn weather in Heidelberg
Autumn in Heidelberg spans from September to November, and the city witnesses a steady decline in temperatures during this period. Temperature highs decrease from 20.6°C (69.1°F) in September to around 9.1°C (48.4°F) in November. Similarly, lows drop from 11.4°C (52.5°F) to 4.1°C (39.4°F). Rainfall remains relatively consistent throughout autumn, varying marginally between 28mm (1.1") to 30mm (1.18").
Winter weather in Heidelberg
The winter season in Heidelberg, from December to February, sees the coldest temperatures of the year, with highs dropping to 4°C (39.2°F) and lows to -0.3°C (31.5°F). Despite the cold, the city experiences the most amount of rainfall during this season, specifically in December with 49mm (1.93"). Additionally, Heidelberg also receives its greatest snowfall in winter, reaching up to 44mm (1.73") in December.
Weather in January
In Heidelberg, Germany, January greets residents with a solid winter chill, following December's patterns closely. Snow and frost are frequent visitors, as winter gets into full swing. The temperature plunges, hitting a significant low of -0.3°C (31.5°F) in the coldest hours. Weather in January »
Weather in February
As Heidelberg transitions between winter and spring, February comes as a reprieve compared to January's intense cold. Still primarily maintaining a wintry mix, the city receives less snow than the preceding month. After experiencing the chilly low of January, the mercury pushes slightly upwards, reaching 5.6°C (42.1°F) in the warmest parts of the day. Weather in February »
Weather in March
Setting the stage for spring, the weather in Heidelberg begins to thaw in March. The city bids goodbye to winter, diving headfirst into a warmer climate than the earlier months. In a noticeable expansion of daylight hours, the city welcomes longer days, highlighting a tell-tale sign of spring. Weather in March »
Weather in April
By the time April rolls around, Heidelberg has firmly stepped into the realm of spring. Compared to March, the weather leans more towards the balmy side with fewer rainfalls. Nature revelers can expect to see greener sceneries, larger blue skies, and an uptick in outdoor activities. Weather in April »
Weather in May
May marks the bridge month in Heidelberg, Germany, as the city transitions from the pleasant spring to summertime. The climb in temperature progresses steadily, bringing ample opportunities for sunbathing and outdoor excursions. The city gears up to accept a considerable rainfall, signaling the lead-up to June. Weather in May »
Weather in June
June drops the curtain to Heidelberg's summer, characterized by relatively humid and warm weather. Compared to May, the city sees less rainfall and draws a mostly sunny and clear weather outlook. This is the month when the city enjoys increased daylight hours, setting the perfect backdrop for a variety of outdoor activities. Weather in June »
Weather in July
July forms the heart of summer in Heidelberg, presenting warm afternoons and mild evenings. Those enjoying outdoor activities or sightseeing will find the climate much to their liking. An increase in UV index encourages wearing sun-protective gear during peak daylight hours. Weather in July »
Weather in August
August rings in the tail end of summer in Heidelberg, with the temperature graph starting to bend downwards gradually. Despite this, the city still enjoys a predominantly warm climate, akin to July. It remains an ideal period for tourist influx, considerably due to its pleasing summer climate. Weather in August »
Weather in September
September acts as the harbinger of autumn in Heidelberg. With the city bidding farewell to summer, a refreshing change in weather emerges, cooling the heated air. The decrease in daytime temperature makes the month an excellent time to explore without worrying excessively about weather conditions. Weather in September »
Weather in October
October, in Heidelberg, reveals a charming shift to fall weather, as the city cloaks itself in myriad autumn hues. The temperature witnesses a gradual drop, prompting residents and visitors to don warmer wear. There's a noticeable shortening of daylight hours as winter approaches. Weather in October »
Weather in November
As November arrives, Heidelberg transitions towards winter, leaving behind the mild autumn climate seen in October. The weather turns notably colder, setting the stage for the forthcoming winter season. With the decrease in daylight hours, the city starts preparing to embrace the chilly winter weather. Weather in November »
Weather in December
In December, winter is in full throttle in Heidelberg. The city, swirling under the snowfall, echoes with holiday festivity and twinkling lights. After a couple of months of steady temperature fall, December brings a winter wonder with snowfall increasing significantly. Weather in December »
Updated: Feb 14, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Heidelberg?
In Heidelberg, January records the average lowest temperatures, peaking at 4°C (39.2°F) and reaching a low of -0.3°C (31.5°F).
What is the most humid month in Heidelberg?
January is the most humid month in Heidelberg, with an average relative humidity of 86%.
How many days does it rain in Heidelberg?
Throughout the year, in Heidelberg, there are 164.2 rainfall days, and 434mm (17.09") of precipitation is accumulated.
When does it snow in Heidelberg?
January through March, October through December are months with snowfall in Heidelberg, Germany.
How much does it snow in Heidelberg?
Throughout the year, in Heidelberg, Germany, there are 15.5 snowfall days, and 116mm (4.57") of snow is accumulated.
What are the months with the lowest UV index in Heidelberg?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the driest month in Heidelberg?
The month with the least rainfall in Heidelberg, Germany, is April, when the rain falls for 11.4 days and typically collects 19mm (0.75") of precipitation.
When it does not snow in Heidelberg?
April through September are months without snowfall.
What is the wettest month in Heidelberg?
May is the month with the most rainfall in Heidelberg, Germany. Rain falls for 15.8 days and accumulates 50mm (1.97") of precipitation.
What are the months with the highest UV index in Heidelberg?
The months with the highest UV index in Heidelberg are May through August, with an average maximum UV index of 5.
When are the longest days in Heidelberg?
With an average of 16h and 12min of daylight, June has the longest days of the year.
What is the least humid month in Heidelberg?
July and August, with an average relative humidity of 67%, are the least humid months.
What is the month with the most sunshine in Heidelberg?
The months with the most sunshine are July and August, with an average of 10.5h of sunshine.
What are the warmest months in Heidelberg?
The warmest period tends to be August, when average temperatures fluctuate between a high of 25.8°C (78.4°F) and a low of 15.3°C (59.5°F).
When is Daylight Saving Time (DST) in Heidelberg?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends in Heidelberg, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
When does it snow the most in Heidelberg?
December is the month with the most snowfall in Heidelberg, Germany. Snow falls for 4.2 days and accumulates 44mm (1.73") of snow.
What is the month with the shortest days in Heidelberg?
December has the shortest days of the year in Heidelberg, with an average of 8h and 18min of daylight.
What is the month with the least sunshine in Heidelberg?
With an average of 4.1h of sunshine, December has the least sunshine of the year.
Average temperature
Heidelberg, Germany
The warmest month (with the highest average high temperature) is August (25.8°C).
The month with the lowest average high temperature is January (4°C).
The month with the highest average low temperature is August (15.3°C).
The coldest month (with the lowest average low temperature) is January (-0.3°C).
Average pressure
Heidelberg, Germany
- Average pressure in January:
1018.3mbar - Average pressure in February:
1017.1mbar - Average pressure in March:
1016.8mbar - Average pressure in April:
1015.7mbar - Average pressure in May:
1016.1mbar - Average pressure in June:
1016.1mbar
- Average pressure in July:
1016mbar - Average pressure in August:
1016.5mbar - Average pressure in September:
1018.3mbar - Average pressure in October:
1018.2mbar - Average pressure in November:
1015mbar - Average pressure in December:
1019.1mbar
The month with the highest atmospheric pressure is December (1019.1mbar).
The month with the lowest atmospheric pressure is November (1015mbar).
Average wind speed
Heidelberg, Germany
- Average wind speed in January:
11.6km/h - Average wind speed in February:
12.3km/h - Average wind speed in March:
12.2km/h - Average wind speed in April:
10.2km/h - Average wind speed in May:
9.7km/h - Average wind speed in June:
9.5km/h
- Average wind speed in July:
9.3km/h - Average wind speed in August:
8.7km/h - Average wind speed in September:
8.8km/h - Average wind speed in October:
9.5km/h - Average wind speed in November:
10.5km/h - Average wind speed in December:
12.1km/h
The windiest month (with the highest average wind speed) is February (12.3km/h).
The calmest month (with the lowest average wind speed) is August (8.7km/h).
Average humidity
Heidelberg, Germany
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are July and August (67%).
Average rainfall
Heidelberg, Germany
The wettest month (with the highest rainfall) is May (50mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days
Heidelberg, Germany
- Average rainfall days in January:
13.3 days - Average rainfall days in February:
11.4 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
11.4 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
15.7 days
- Average rainfall days in July:
16.4 days - Average rainfall days in August:
15.1 days - Average rainfall days in September:
10.8 days - Average rainfall days in October:
12.9 days - Average rainfall days in November:
13.2 days - Average rainfall days in December:
14.9 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is September (10.8 days).
Average snowfall
Heidelberg, Germany
The month with the highest snowfall is December (44mm).
The months with the least snowfall are April, May, June, July, August and September (0mm).
Average snowfall days
Heidelberg, Germany
- Average snowfall days in January:
5.4 days - Average snowfall days in February:
3.8 days - Average snowfall days in March:
1.2 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
0.8 days - Average snowfall days in December:
4.2 days
The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are April, May, June, July, August and September (0 days).
Average daylight / Average sunshine
Heidelberg, Germany
- Average daylight in January:
8h and 4min - Average daylight in February:
10h and 1min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 2min - Average daylight in June:
16h and 1min
- Average daylight in July:
15h and 5min - Average daylight in August:
14h and 2min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 1min - Average daylight in December:
8h and 2min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 4min - Average sunshine in April:
9h and 2min - Average sunshine in May:
9h and 2min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
10h and 3min - Average sunshine in September:
8h and 4min - Average sunshine in October:
6h and 0min - Average sunshine in November:
4h and 4min - Average sunshine in December:
4h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days
Heidelberg, Germany
- Average sunshine days in January:
13.3 days - Average sunshine days in February:
12.9 days - Average sunshine days in March:
14.6 days - Average sunshine days in April:
17 days - Average sunshine days in May:
13 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
12 days - Average sunshine days in August:
12.5 days - Average sunshine days in September:
17.3 days - Average sunshine days in October:
15.5 days - Average sunshine days in November:
13.9 days - Average sunshine days in December:
11.5 days
The month with the most sunshine days is September (17.3 days).
The month with the least sunshine days is December (11.5 days).
Average UV index
Heidelberg, Germany
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Heidelberg, Germany
The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Heidelberg, Germany
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January and December (8km).
