Climate and monthly weather forecast
Cardiff, United Kingdom

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The climate of Cardiff

In the heart of the United Kingdom, the city of Cardiff is recognized by the Köppen climate classification as having a Marine west coast climate, denoted by a warm summer (Cfb). Throughout the year, it is characterized by a typically mild, coastal climate with both temperature and humidity levels remaining fairly consistent.

Observing the temperatures in Cardiff, they range from a high average of 19°C (66.2°F) during the peak summer month of July, to a low average of around 4.1°C (39.4°F) in the coldest month of January. Humidity levels hover in the band between 81 to 86%, meaning the air keeps a substantial level of moisture throughout the year, contributing to its mild weather conditions. An interesting yet consistent pattern arises in Cardiff’s rainfall, with the highest levels of precipitation observed during the latter months of the year, particularly October and November with 31mm (1.22") apiece. While rainfall remains prevalent across all months, maximum levels occur through Autumn and early winter seasons.

Unique to Cardiff is its modest snowfall, with snow appearing occasionally in January, February, and December, amounting to no more than 1mm (0.04") and barely reaching a full day of snowfall during these months. Another intriguing attribute is the visibility averaging around 9km (5.6mi) to 10 km, promising fairly clear views throughout the year in this coastal city.

The best time to visit Cardiff

Considering weather elements such as temperature and sunshine hours, the best period to visit Cardiff would be between May to September. During these months, the city experiences comparatively warmer conditions with high temperatures fluctuating from 14.7°C (58.5°F) in May, reaching a peak at 19°C (66.2°F) in July before cooling to 17.1°C (62.8°F) in September. This period of warmth coincides with increased daylight hours, ascending to the maximum of 16.5 hours in June, thus extending opportunities for extended outdoor activities and sightseeing.

Simultaneously, these months witness longer sunshine hours in a day. Notably, July leads with an average of 8.1 hours of sunshine. Moreover, UV index maintains a moderate level of 4, suggesting less potential harm from unprotected sun exposure. Besides, the city experiences a nominal rainfall amount from May to September, thereby reducing likelihood of disruptions for outdoor plans.

The worst time to visit Cardiff

If weather plays a major role in planning a visit to Cardiff, it might be best to avoid the months from November to February. The temperatures during these months can fall to a low average of between 4.1°C (39.4°F) to 5.2°C (41.4°F). An increased rainfall, particularly in November and December with recorded averages of 31mm (1.22"), coupled with a high relative humidity of up to 86%, can potentially dampen the overall travel experience.

Adding to this, the city receives less sunshine during these periods, with the lowest average falling to 3.9 hours in November. Snowfall, although scarce, happens in these months, making travelling slightly more challenging and cold.

Spring weather in Cardiff

Spring in Cardiff, spanning from March to May, sees a gradual rise in temperatures from 9.8°C (49.6°F) in March to 14.7°C (58.5°F) in May. Relative humidity remains fairly constant, averaging around 81%. The rainfall amount decreases to its yearly low with 12mm (0.47") recorded in April.

Sunlight begins to lengthen, offering increasing daylight hours from March’s 11.9 hours, peaking at May’s 15.6 hours. Correspondingly, residents and visitors are blessed with increased sunshine hours which, in May, stretch to an appreciable 8.2 hours a day.

Summer weather in Cardiff

Summer months in Cardiff, between June and August, are marked by warmer temperatures peaking at 19°C (66.2°F) in July, albeit accompanied by an uptick in rainfall, reaching a high of 22mm (0.87") in June. A slight uptick in relative humidity to 83% also takes place. Days in June are longest with an average daylight of 16.5 hours providing plenty of opportunities for outdoor recreation.

The city also experiences increased sunshine hours of up to 8.1 hours in July. Sea temperatures rise as well, warming to 16.6°C (61.9°F) by August, making it an ideal time for water-related activities.

Autumn weather in Cardiff

Autumn in Cardiff, which lasts from September to November, witnesses a progressive dip in temperature from 17.1°C (62.8°F) in September to a cooler 10.4°C (50.7°F) in November. The relative humidity remains steady at 83%, while rainfall levels escalate to 31mm (1.22") in both October and November.

Lighting conditions deteriorate with daylight reducing from 12.6 hours in September to 8.9 hours by November. Sunshine hours also diminish, dropping from 7.2 hours in September to a yearly low of 3.9 hours in November.

Winter weather in Cardiff

Winters in Cardiff extend from December to February, featuring average high temperatures in the range of 7.5°C (45.5°F) to 8.6°C (47.5°F) and lows between 4.1°C (39.4°F) to 5.2°C (41.4°F). These months also register a higher relative humidity level, reaching 86%. The rainfall reaches 27mm (1.06") in December before scaling back to 16mm (0.63") in January and rises back up to 22mm (0.87") in February.

Daylight hours are at their shortest, with December averaging just 7.9 hours a day, while the sunshine hours stay around 4.1 hours a day. Moreover, snowfall is occasionally observed during this period, though it remains minimal with only 1mm (0.04") registered in the months of January and December.

Weather in January

January in Cardiff, United Kingdom, marks the beginning of the year with predominant wintery conditions. As temperatures can descend to 4.1°C (39.4°F), this month experiences the chilling winds, rushing with an average speed of 21.6km/h (13.4mph) maximising at 22.9km/h (14.2mph). Weather in January »

Weather in February

It is still wintertime in Cardiff, United Kingdom, during the month of February. Temperatures begin a slow climb from the January low, reaching up to 7.8°C (46°F). February sees a notable 5mm (0.2") of snowfall, distinguishing it from the previous and proceeding month. Weather in February »

Weather in March

Cardiff, United Kingdom, welcomes spring in March. With temperatures rising to 9.8°C (49.6°F), this month experiences a departure from the low temperatures of February. Free of snowfall, March signifies a shift in seasons and brings about a palpable excitement in the air as the chill diminishes. Weather in March »

Weather in April

April in Cardiff, United Kingdom, continues the pleasant trend of rising temperatures, reaching the high of 12.3°C (54.1°F), marking the onset of warmer weather. This is the first month of the year to completely steer clear of snowfall, signifying the definitive end of winter. Weather in April »

Weather in May

May in Cardiff, United Kingdom, is characterized by the pleasant warmth and escalating daylight hours. Mild temperatures continue to rise in May to a maximum of 14.7°C (58.5°F), indicating the arrival of summer from the comfortably warm spring. Weather in May »

Weather in June

It is summertime in Cardiff, United Kingdom, in June. With temperatures topping at 17.3°C (63.1°F), it’s clear summer is taking charge from the preceding spring. Long sunny days make June the perfect time for picnicking at Sophia Gardens, watching cricket matches or taking long coast-side walks. Weather in June »

Weather in July

July in Cardiff, United Kingdom, reaches the pinnacle of summer with temperatures peaking to the year's maximum of 19°C (66.2°F). This month offers 16.1 daylight hours, the highest all year, culminating in Cardiff summers' high point. Weather in July »

Weather in August

August in Cardiff, United Kingdom, is still in the Summer season. The weather parallels July's conditions, with the highest sea temperatures being 16.6°C (61.9°F). Despite consecutive hot months of July and August, the city retains its charm with a constant 9km (5.6mi) visibility. Weather in August »

Weather in September

September in Cardiff, United Kingdom, marks the transition from balmy summer to cooler autumn. The temperature dips to 17.1°C (62.8°F), manifesting the initial traces of autumn as the warmth of summer begins to fade away. Enjoy the merging of seasons under the purple hues of the sky with 12.6 daylight hours. Weather in September »

Weather in October

October in Cardiff, United Kingdom, is deep into autumn. This seasonal shift brings a decline in temperatures, which record a decrease from September's 17.1°C (62.8°F) to October's 14.1°C (57.4°F). Along with shedding temperatures, this month records a surge in rainfall to 26mm (1.02"), making it relatively wet compared to the drier September. Weather in October »

Weather in November

November in Cardiff, United Kingdom, reveals the final phase of Autumn. As temperatures slide further to 10.4°C (50.7°F), this month brings the city closer to the threshold of winter. An increase in rainfall to 31mm (1.22") makes the city's scenery exceptionally lush and vibrant. Weather in November »

Weather in December

December in Cardiff, United Kingdom, introduces the chill of winter once again with temperatures dropping to 8.6°C (47.5°F). December is relatively colder than the preceding month and marks the beginning of the winter season. Weather in December »

Frequently asked questions

What part of the year is the coldest in Cardiff?

January, having an average high-temperature of 7.5°C (45.5°F) and an average low-temperature of 4.1°C (39.4°F), is the coldest month in Cardiff, United Kingdom.

How much does it rain in Cardiff?

Throughout the year, there are 132.6 rainfall days, and 252mm (9.92") of precipitation is accumulated.

When does it snow in Cardiff?

Months with snowfall are January, February, November and December.

How much does it snow in Cardiff?

In Cardiff, United Kingdom, during the entire year, snow falls for 3.1 days and aggregates up to 8mm (0.31") of snow.

When is the lowest UV index in Cardiff?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

When does it snow the most in Cardiff?

February is the month with the most snowfall. Snow falls for 1 days and accumulates 5mm (0.2") of snow.

When it does not snow in Cardiff?

In Cardiff, United Kingdom, snow does not fall in March through October.

What is the month with the coldest sea water in Cardiff?

March is the month with the coldest seawater in Cardiff, with an average sea temperature of 8.7°C (47.7°F).

What are the least humid months in Cardiff?

April and May, with an average relative humidity of 81%, are the least humid months.

What is the driest month in Cardiff?

April is the month with the least rainfall. Rain falls for 9.1 days and accumulates 12mm (0.47") of precipitation.

What month has the most sunshine in Cardiff?

With an average of 8.2h of sunshine, May has the most sunshine of the year in Cardiff.

When is the highest UV index in Cardiff?

The months with the highest UV index are May through September, with an average maximum UV index of 4.

When are the longest days in Cardiff?

With an average of 16h and 36min of daylight, June has the longest days of the year.

What are the warmest months in Cardiff?

Cardiff's temperatures tend to reach their peak averages in July, with a high of 19°C (66.2°F) and a low of 13°C (55.4°F).

What is the rainiest month in Cardiff?

The months with the most rainfall in Cardiff are August and November, with an average 31mm (1.22") of precipitation.

When is the sea warmest in Cardiff?

August and September, with an average sea temperature of 16.6°C (61.9°F), are months with the warmest seawater.

When is Daylight Saving Time (DST) in Cardiff?

On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Cardiff, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to BST.

What are the most humid months in Cardiff?

The months with the highest humidity in Cardiff, United Kingdom, are November and December, with an average relative humidity of 86%.

What is the month with the least sunshine in Cardiff?

With an average of 3.9h of sunshine, November has the least sunshine of the year.

What is the month with the shortest days in Cardiff?

The month with the shortest days is December, with an average of 7h and 54min of daylight.

Average temperature
Cardiff, United Kingdom

Average temperature - Cardiff, United Kingdom

The warmest month (with the highest average high temperature) is July (19°C).
The month with the lowest average high temperature is January (7.5°C).

The month with the highest average low temperature is August (13.3°C).
The coldest month (with the lowest average low temperature) is February (3.9°C).

Average pressure
Cardiff, United Kingdom

Average pressure - Cardiff, United Kingdom

The month with the highest atmospheric pressure is September (1016.8mbar).
The month with the lowest atmospheric pressure is November (1010mbar).

Average wind speed
Cardiff, United Kingdom

Average wind speed - Cardiff, United Kingdom

The windiest month (with the highest average wind speed) is February (22.3km/h).
The calmest months (with the lowest average wind speed) are June and July (15.2km/h).

Average humidity
Cardiff, United Kingdom

Average humidity - Cardiff, United Kingdom

The months with the highest relative humidity are November and December (86%).
The months with the lowest relative humidity are April and May (81%).

Average rainfall
Cardiff, United Kingdom

Average rainfall - Cardiff, United Kingdom

The wettest months (with the highest rainfall) are August and November (31mm).
The driest month (with the least rainfall) is April (12mm).

Average rainfall days
Cardiff, United Kingdom

Average rainfall days - Cardiff, United Kingdom

The month with the highest number of rainy days is November (13.5 days).
The months with the least rainy days are February and April (9.1 days).

Average snowfall
Cardiff, United Kingdom

Average snowfall - Cardiff, United Kingdom

The month with the highest snowfall is February (5mm).
The months with the least snowfall are March, April, May, June, July, August, September and October (0mm).

Average snowfall days
Cardiff, United Kingdom

Average snowfall days - Cardiff, United Kingdom

The month with the highest number of snowfall days is February (1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average sea temperature
Cardiff, United Kingdom

Average sea temperature - Cardiff, United Kingdom

The best months for swimming (with the highest average sea temperature) are August and September (16.6°C).
The coldest month (with the lowest average sea temperature) is March (8.7°C).

Average daylight / Average sunshine
Cardiff, United Kingdom

Average daylight / Average sunshine - Cardiff, United Kingdom

The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).

The month with the most sunshine is May (Average sunshine: 8h and 12min).
The month with the least sunshine is November (Average sunshine: 3h and 54min).

Average sunshine days
Cardiff, United Kingdom

Average sunshine days - Cardiff, United Kingdom

The month with the most sunshine days is April (19.2 days).
The month with the least sunshine days is November (13.7 days).

Average UV index
Cardiff, United Kingdom

Average UV index - Cardiff, United Kingdom

The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average visibility
Cardiff, United Kingdom

Average visibility - Cardiff, United Kingdom

The months with the highest visibility are February, March and December (10km).
The months with the lowest visibility are January, April, May, June, July, August, September, October and November (9km).

Cardiff, United Kingdom

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