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Contents
- The climate of Heerlen
- The best time to visit Heerlen
- The worst time to visit Heerlen
- Spring weather in Heerlen
- Summer weather in Heerlen
- Autumn weather in Heerlen
- Winter weather in Heerlen
- 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
The climate of Heerlen
Located in the Netherlands, Heerlen falls under the Cfb climate category as per the Köppen classification. Its geographical positioning lends it a Marine West Coast climate with a warm summer. Over the course of a year in Heerlen, the temperatures range from a low average of 0.4°C (32.7°F) during the cooler months to a peak average of 22.6°C (72.7°F) in the warm season.
Relative humidity readings indicate an annual average between 75% to 87%, highlighting the humid characteristic of the climate. Year-round average rainfall varies from 22mm (0.87") to 51mm (2.01") monthly, with August being the wettest month at 49mm (1.93"). The area receives rainfall throughout the year with rainfall days varying between 12.6 to 18 days per month.
This area is accustomed to snow, particularly between the months of January and March, and again in November and December, with the largest amount of snowfall occurring in January at 48mm (1.89"). Sunshine hours fluctuate between 3.9 hours to 9.2 hours per day while days with a measurable sunshine duration average between 9.8 to 15.5 days. Heerlen experiences moderate ultraviolet (UV) index values that vary from 2 to 5 throughout the year.
Relative humidity readings indicate an annual average between 75% to 87%, highlighting the humid characteristic of the climate. Year-round average rainfall varies from 22mm (0.87") to 51mm (2.01") monthly, with August being the wettest month at 49mm (1.93"). The area receives rainfall throughout the year with rainfall days varying between 12.6 to 18 days per month.
This area is accustomed to snow, particularly between the months of January and March, and again in November and December, with the largest amount of snowfall occurring in January at 48mm (1.89"). Sunshine hours fluctuate between 3.9 hours to 9.2 hours per day while days with a measurable sunshine duration average between 9.8 to 15.5 days. Heerlen experiences moderate ultraviolet (UV) index values that vary from 2 to 5 throughout the year.
The best time to visit Heerlen
Contemplating a trip to Heerlen will require knowledge of its weather conditions. July and August, boasting average high temperatures of 22.6°C (72.7°F), are the warmest months. During these months, visitors can take full advantage of approximately 16 hours of daylight and 9 hours of sunshine to explore the city. Despite seeing the highest rainfall in August with 48mm (1.89"), the mild temperatures and long daylight hours still present an ideal time for tourists.
The worst time to visit Heerlen
December, with an average temperature low of 1.9°C (35.4°F) and the least amount of daily sunshine at 3.7 hours, might not be the best time for travels to Heerlen. In addition, this month witnesses the highest rainfall of 51mm (2.01"), further deteriorating the situation for any planned outdoor activities.
Spring weather in Heerlen
Spring in Heerlen is often characterized by gradually rising temperatures and decreasing rainfall. Between March and May, average temperatures increase from 9.8°C (49.6°F) to 17.3°C (63.1°F). Rainfall during this period decreases from 42mm (1.65") to 22mm (0.87"), making it the driest season. The number of sunlight hours also increases, from 11.9 hours in March to 15.5 hours in May.
Summer weather in Heerlen
Summers are typically warm in Heerlen, with average temperatures peaking at around 22.6°C (72.7°F) in July and August. These months also witness the longest daylight durations, up to 16.4 hours, and the highest UV index of 5. Although summer brings an increase in precipitation from 43mm (1.69") to 49mm (1.93"), sunshine duration remains generous, around 9 hours a day, allowing ample opportunities for outdoor activities.
Autumn weather in Heerlen
Autumn in Heerlen records declining temperatures from a warm 18.7°C (65.7°F) in September to a much cooler 9.5°C (49.1°F) by November. Along with this decline, daylight duration reduces from 12.6 hours to 9 hours. Rainfall figures increase from 28mm (1.1") to 38mm (1.5") with corresponding rainfall days ranging from 12.2 days to 15.3 days by November.
Winter weather in Heerlen
Winter weather in Heerlen is predominated by lower temperatures that range from 5.7°C (42.3°F) in December to 4.3°C (39.7°F) in February, accompanied by a decrease in daylight hours down to eight by December. Winters also usher in the snowy period with January receiving the highest amount of snowfall at 48mm (1.89"). Despite being the coldest, the winter months also bring along high humidity levels hovering around 87%. The season witnesses a drop in UV Index to 2, indicating the diminished strength of sun’s rays.
Weather in January
The year in Heerlen, Netherlands, commences with a frigid and snowy winter month. January brings a sharp decrease in temperatures, making it the coldest month of the year. Harsh winter conditions limit daylight hours to a minimum, while relative humidity is at its peak. Weather in January »
Weather in February
Transitioning into February, Heerlen experiences consistent winter conditions with minimal climatic changes from the previous month. Due to this continuing chill, February remains a prominent month for winter leisure activities. Weather in February »
Weather in March
With the arrival of March, signs of spring begin to emerge in Heerlen. The overall climate sees a gradual shift with increasing temperatures, falling snowfall, and lengthening daylight hours. This warming trend symbolizes the transitioning weather pattern from winter towards spring. Weather in March »
Weather in April
Weather in Heerlen during April embodies the spring equilibrium. This period witnesses the harmonious play of a mild climate, increased sunshine, and blooming fauna. The air pressure maintains a steady level, mirroring the static state of the month's meteorological conditions. Weather in April »
Weather in May
Continuing the trend from April, the city of Heerlen greets May with an escalation in spring vibrancy. May brings lovely springtime weather, defined by a blend of increasing temperatures, abundant sunshine, and infrequent rain showers. Weather in May »
Weather in June
June in Heerlen announces the arrival of summer with the longest daylight hours of the year. These extended daylight periods create vibrant and lively atmospheres for residents. The summer solstice towards the latter half of June highlights this temporal peak. Weather in June »
Weather in July
Known as the peak of summer, July inaugurates the warmest climatic conditions in Heerlen. The city basks in the golden rays of the sun, yielding long, sun-filled days. July suggests opportunities for numerous outdoor activities, special events, and summer festivals. Weather in July »
Weather in August
August replicates the conditions of July, offering similar temperature patterns and weather conditions. As the modern-day adage suggests, "as hot as August," the warmth prevalent during this period is unsurprising. Although the average temperatures remain unvarying, the daylight hours begin to reduce slightly. Weather in August »
Weather in September
September signals the beginning of autumn in Heerlen. The weather turns relatively cooler, signaling the retreat of summer. Gold-hued leaves, cooler temperatures, and crisp autumn air become synonymous with September. Noteworthy is that wind speed manifests a minor increase compared to August, moving up to 11.4km/h (7.1mph); this factor amplifies the autumnal feel in the city. Weather in September »
Weather in October
The gentle autumn season of Heerlen progresses into October, bringing moderate temperatures, increasing rainfall, and decreasing daylight. The city embraces these changes with scenic autumn views, events, and festivities. October stands out for its spectacular fall foliage, abundant harvest, and festivities like Halloween. Weather in October »
Weather in November
November epitomizes the late autumn season in Heerlen, bringing a drop in temperature coupled with a rise in humidity. The city prepares for the upcoming winter as the daylight hours dwindle, this leaves locals reminiscing the bright summer days. Weather in November »
Weather in December
Approaching the end of the year, Heerlen transitions into a true winter wonderland during December. The weather witnesses depleted temperatures, enhanced wind speeds, and increased snowfall compared to November. This month hosts Christmas, undoubtedly amplifying the joy and magic synonymous with a white winter. Weather in December »
Updated: Jan 25, 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 are the coldest months in Heerlen?
Heerlen's coldest temperatures are experienced in January, with average high temperatures of 4.3°C (39.7°F) and lows of 0.4°C (32.7°F).
What are the most humid months in Heerlen?
The months with the highest humidity in Heerlen, Netherlands, are January and December, with an average relative humidity of 87%.
How much does it rain in Heerlen?
Throughout the year, in Heerlen, Netherlands, there are 182.5 rainfall days, and 482mm (18.98") of precipitation is accumulated.
When does it snow in Heerlen?
Months with snowfall are January through March, November and December.
When does it snow the most in Heerlen?
The month with the most snowfall in Heerlen, Netherlands, is January, when snow falls for 5.9 days and typically aggregates up to 48mm (1.89") of snow.
How many days does it snow in Heerlen?
Throughout the year, in Heerlen, there are 19.8 snowfall days, and 147mm (5.79") of snow is accumulated.
What are the months with the lowest UV index in Heerlen?
The months with the lowest UV index in Heerlen are January, February, November and December, with an average maximum UV index of 2.
What is the least humid month in Heerlen?
With an average relative humidity of 75%, April is the least humid month in Heerlen, Netherlands.
What is the driest month in Heerlen?
April is the month with the least rainfall. Rain falls for 13 days and accumulates 22mm (0.87") of precipitation.
When it does not snow in Heerlen?
April through October are months without snowfall.
When are the longest days in Heerlen?
With an average of 16h and 24min of daylight, June has the longest days of the year.
What is the month with the highest UV index in Heerlen?
June and July, with an average maximum UV index of 5, are months with the highest UV index.
What time of the year is the hottest in Heerlen?
During July and August, Heerlen experiences its warmest period, with an average high-temperature of 22.6°C (72.7°F).
What month has the most sunshine in Heerlen?
With an average of 9.2h of sunshine, August has the most sunshine of the year in Heerlen.
When is Daylight Saving Time (DST) in Heerlen?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends in Heerlen, 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.
What is the wettest month in Heerlen?
The month with the most rainfall in Heerlen, Netherlands, is December, when the rain falls for 16 days and typically aggregates up to 51mm (2.01") of precipitation.
What is the month with the shortest days in Heerlen?
December has the shortest days of the year in Heerlen, Netherlands, with an average of 8h and 0min of daylight.
What is the month with the least sunshine in Heerlen?
With an average of 3.7h of sunshine, December has the least sunshine of the year in Heerlen, Netherlands.
Average temperature
Heerlen, Netherlands
The warmest months (with the highest average high temperature) are July and August (22.6°C).
The month with the lowest average high temperature is January (4.3°C).
The month with the highest average low temperature is August (13.7°C).
The coldest month (with the lowest average low temperature) is January (0.4°C).
Average pressure
Heerlen, Netherlands
- Average pressure in January:
1016.4mbar - Average pressure in February:
1015.5mbar - Average pressure in March:
1016.1mbar - Average pressure in April:
1015.8mbar - Average pressure in May:
1016.2mbar - Average pressure in June:
1016.1mbar
- Average pressure in July:
1015.6mbar - Average pressure in August:
1015.7mbar - Average pressure in September:
1017.6mbar - Average pressure in October:
1016.8mbar - Average pressure in November:
1013.1mbar - Average pressure in December:
1016.7mbar
The month with the highest atmospheric pressure is September (1017.6mbar).
The month with the lowest atmospheric pressure is November (1013.1mbar).
Average wind speed
Heerlen, Netherlands
- Average wind speed in January:
16.7km/h - Average wind speed in February:
17.2km/h - Average wind speed in March:
15.4km/h - Average wind speed in April:
12.2km/h - Average wind speed in May:
11.8km/h - Average wind speed in June:
11.6km/h
- Average wind speed in July:
11.2km/h - Average wind speed in August:
11.1km/h - Average wind speed in September:
11.4km/h - Average wind speed in October:
13.5km/h - Average wind speed in November:
15.1km/h - Average wind speed in December:
17.6km/h
The windiest month (with the highest average wind speed) is December (17.6km/h).
The calmest month (with the lowest average wind speed) is August (11.1km/h).
Average humidity
Heerlen, Netherlands
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is April (75%).
Average rainfall
Heerlen, Netherlands
The wettest month (with the highest rainfall) is December (51mm).
The driest month (with the least rainfall) is April (22mm).
Average rainfall days
Heerlen, Netherlands
- Average rainfall days in January:
14.8 days - Average rainfall days in February:
12.6 days - Average rainfall days in March:
15.3 days - Average rainfall days in April:
13 days - Average rainfall days in May:
18 days - Average rainfall days in June:
16.8 days
- Average rainfall days in July:
18 days - Average rainfall days in August:
17.9 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
12.6 days - Average rainfall days in November:
15.3 days - Average rainfall days in December:
16 days
The months with the highest number of rainy days are May and July (18 days).
The month with the least rainy days is September (12.2 days).
Average snowfall
Heerlen, Netherlands
The month with the highest snowfall is January (48mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days
Heerlen, Netherlands
- Average snowfall days in January:
5.9 days - Average snowfall days in February:
5.5 days - Average snowfall days in March:
2.4 days - Average snowfall days in April:
0.5 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 days - Average snowfall days in November:
1.6 days - Average snowfall days in December:
3.9 days
The month with the highest number of snowfall days is January (5.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Heerlen, Netherlands
- Average daylight in January:
8h and 3min - Average daylight in February:
10h and 0min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 4min - Average daylight in June:
16h and 2min
- Average daylight in July:
16h and 0min - Average daylight in August:
14h and 3min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
9h and 0min - Average daylight in December:
8h and 0min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in January:
3h and 5min - Average sunshine in February:
4h and 1min - Average sunshine in March:
5h and 5min - Average sunshine in April:
8h and 2min - Average sunshine in May:
8h and 1min - Average sunshine in June:
8h and 4min
- Average sunshine in July:
9h and 1min - Average sunshine in August:
9h and 1min - Average sunshine in September:
7h and 5min - Average sunshine in October:
5h and 2min - Average sunshine in November:
4h and 2min - Average sunshine in December:
3h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).
Average sunshine days
Heerlen, Netherlands
- Average sunshine days in January:
10.8 days - Average sunshine days in February:
10.3 days - Average sunshine days in March:
12.7 days - Average sunshine days in April:
13.3 days - Average sunshine days in May:
10.3 days - Average sunshine days in June:
9.8 days
- Average sunshine days in July:
10.5 days - Average sunshine days in August:
11.1 days - Average sunshine days in September:
15.5 days - Average sunshine days in October:
15.5 days - Average sunshine days in November:
10.8 days - Average sunshine days in December:
10.3 days
The months with the most sunshine days are September and October (15.5 days).
The month with the least sunshine days is June (9.8 days).
Average UV index
Heerlen, Netherlands
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Heerlen, Netherlands
The month with the most cloud cover is December (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility
Heerlen, Netherlands
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).
Heerlen, Netherlands
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