Climate and monthly weather forecast
London, United Kingdom

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The large Thames river overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom
The large Thames river overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom

The climate of London

Belonging to the Köppen climate classification Cfb, the city of London experiences a marine west coast climate with warm summers. This classification reflects the city's geographical location within the British Isles, situated at the southeastern end of England. As the country's capital, London faces a variety of weather changes throughout the year.

Overall, London's weather swings are moderate, with rainfall occurring relatively evenly throughout the year. The volume of rainfall increases slightly from June to August, peaking at 45mm (1.77") in June, and reaches its lowest at 22mm (0.87") in April. Snowfall, on the other hand, is quite rare and typically occurs only in the months from December till February with a significant drop afterward.

As for temperature, the summer months from June to August have a higher temperature range from 19.8°C (67.6°F) to 22.3°C (72.1°F), while the winter months from December to February experience a lower range from 2.2°C (36°F) to 7.8°C (46°F). London's relative humidity remains consistent around mid-70s to high 80s%. Daylight hours are longer in the summer months with up to 16.5 hours per day in June, and shorter in winter, dwindling to a mere 7.9 hours per day in December.

The best time to visit London

The most ideal time for visiting London falls between late spring and early summer, particularly May and June. During these months, the temperature ranges from 14.3°C (57.7°F) to 19.8°C (67.6°F), providing a comfortable climate for outdoor activities and sightseeing. Furthermore, travellers can enjoy up to 16.5 hours of daylight in June, maximizing their exploration time. Also, from May to June, the rainfall is relatively lower than other months, varying between 22mm (0.87") and 26mm (1.02").

The worst time to visit London

Although London experiences moderate weather changes, the least preferred time to visit is between November and February. The city experiences its coldest temperatures, from 2.2°C (36°F) to 7.8°C (46°F), during these periods. Additionally, the amount of daylight is limited to less than 9 hours per day. Rainfall increases to 34mm (1.34") in November and 37mm (1.46") in December while the likelihood of snowfall also increases, with December and January showing the most snowfall at 2mm (0.08") and 9mm (0.35") respectively.

Spring weather in London

From March to May, London experiences spring weather. March introduces a gradual rise in temperature, from a low of 3.7°C (38.7°F) to a high of 10.6°C (51.1°F). By May, temperatures range from 8.3°C (46.9°F) to 16.8°C (62.2°F). Simultaneously, the amount of daylight begins to lengthen from 11.9 hours in March to 15.6 hours by May. Although rainfall increases during this season from 24mm (0.94") to 26mm (1.02"), it is still quite manageable for tourists.

Summer weather in London

June kicks off the summer season, with temperatures continuing to rise, ranging from 11°C (51.8°F) to 22.3°C (72.1°F) in July. However, the months of summer receive the highest volumes of rainfall, with June witnessing up to 45mm (1.77"). Despite the rain, the city becomes a centre of activities with up to 16.5 hours of daylight daily, and an average UV index of 5.

Autumn weather in London

London's autumn, from September to November, sees a decrease in temperature, fluctuating between 5.7°C (42.3°F) to 19°C (66.2°F). The hours of daylight start decreasing substantially, limiting to 10.7 hours by the end of November. The rainfall remains moderate during this period, ranging between 26mm (1.02") to 34mm (1.34") per month.

Winter weather in London

London's winter months, from December to February, see temperatures drop to their lowest, with ranges between 2.2°C (36°F) to 7.6°C (45.7°F). The city experiences its shortest daylight durations throughout the winter months, reaching a minimum of 7.9 hours in December. Rainfall slightly increases during this period from 34mm (1.34") to 37mm (1.46") and the possibility of snowfall becomes reality, with January experiencing 7mm (0.28") of snow. This can create a picture-perfect scene for those dreaming of a classic Winter Christmas.

Weather in January

London greets the New Year with an atmosphere filled with cold temperatures and often damp conditions. The scarce daylight makes it one of the darkest months of the year, though there's a slight chance of the city experiencing snowfall. Weather in January »

Weather in February

As London moves further into the year, February marks a slight increase in average temperatures. However, it's still considered a winter month, with a higher possibility of experiencing snowfall than in January. Lesser precipitation signifies a welcomed, albeit slight, move towards warmer weather. Weather in February »

Weather in March

March signals the advent of spring in London, bringing a general uplifting mood due to the milder, more agreeable weather. The snowfall completely recedes, giving way to a largely frost-free environment. Relative to February, both temperatures and daylight hours start to increase, promising the arrival of more pleasant days. Weather in March »

Weather in April

April brings a definitive arrival of spring, characterized by increased temperatures and considerable daylight hours. It's a marked departure from March's lingering aspects of winter. In contrast to the anticipated warmth of May, April holds a balanced climate, not too cold nor too warm. Weather in April »

Weather in May

May in London offers the first taste of summer, with warmer temperatures and blooming city parks. Its longer daylight hours promise sunnier days, presenting a marked difference from the relatively rainier April. The weather continues to brighten into June, making May one of the most popular months for outdoor activities. Weather in May »

Weather in June

June commences summer in London, accompanied by predominantly warm, dry conditions. These conditions are a significant advancement from May's climate. In comparison to what can be expected in July, June is slightly milder yet still comfortably warm. Weather in June »

Weather in July

July is the peak of summer in London, typically registering the highest average temperatures. Compared to June, it's unmistakably hotter and can be increasingly humid at times. While August presents similar weather characteristics, temperatures are likely to start dropping slightly. Weather in July »

Weather in August

August provides London with the tail-end of summer's warmth. The weather shows small variances from July, maintaining high temperatures and hours of sunlight. September's arrival ushers in the early signs of autumn, signified by cooler temperatures. Weather in August »

Weather in September

In September, London gradually starts to wave goodbye to summer. The weather, while remaining reasonably fair, shows noticeable changes from August. With the approaching October, further drops in temperature can be expected. However, the crisp air and fewer tourists make September an agreeable month to explore London. Weather in September »

Weather in October

October in London ushers in the autumn season in earnest, with temperatures dropping steadily. The weather starkly contrasts that of September, introducing a characteristic chilly wind to the city. Heading into November, these autumn conditions persist, with temperatures continuing their downwards trend. Weather in October »

Weather in November

November in London is typically characterized by colder temperatures and an increase in average rainfall. The transition from October is marked with shorter daylight hours, announcing the arrival of winter. Looking ahead to December, colder and shorter days are on the horizon. Weather in November »

Weather in December

December brings the full onset of winter into London. From November, it's noticeably colder with shorter daylight hours. Compared to what's to come in January, December bears similar weather characteristics but with marginally increased temperatures. Weather in December »
Updated: Feb 8, 2024 | Published by: Weather Atlas | About Us

Frequently asked questions

What are the coldest months in London?

London's temperature records reveal January as the coldest month, marked by average highs of 6.8°C (44.2°F) and lows of 2.2°C (36°F).

How many days does it rain in London?

Throughout the year, in London, there are 151.7 rainfall days, and 370mm (14.57") of precipitation is accumulated.

When does it snow in London?

January through April, November and December are months with snowfall in London.

How much does it snow in London?

In London, during the entire year, snow falls for 7.7 days and aggregates up to 50mm (1.97") of snow.

When is the lowest UV index in London?

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

What is the snowiest month in London?

February is the month with the most snowfall in London, United Kingdom. Snow falls for 2.5 days and accumulates 16mm (0.63") of snow.

What is the month with the least sunshine in London?

February has the least sunshine of the year in London, United Kingdom, with an average of 3.6h of sunshine.

What is the driest month in London?

The month with the least rainfall is April, when the rain falls for 13.1 days and typically collects 22mm (0.87") of precipitation.

When it does not snow in London?

In London, snow does not fall in May through October.

What is the rainiest month in London?

The month with the most rainfall in London is June, when the rain falls for 16 days and typically aggregates up to 45mm (1.77") of precipitation.

When are the longest days in London?

The month with the longest days in London, United Kingdom, is June, with an average of 16h and 36min of daylight.

What is the month with the highest UV index in London?

June and July, with an average maximum UV index of 5, are months with the highest UV index in London.

What time of the year is the hottest in London?

July proves to be the warmest month in London, recording an average peak temperature of 22.3°C (72.1°F) and a minimum temperature of 13.5°C (56.3°F).

What is the least humid month in London?

The least humid month in London is August, with an average relative humidity of 72%.

What month has the most sunshine in London?

With an average of 7.9h of sunshine, August has the most sunshine of the year in London.

When is Daylight Saving Time (DST) in London?

On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in London, 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 is the most humid month in London?

The most humid month is December, with an average relative humidity of 88%.

What is the month with the shortest days in London?

December has the shortest days of the year in London, United Kingdom, with an average of 7h and 54min of daylight.

Average temperature
London, United Kingdom

Average temperature - London, United Kingdom

The warmest month (with the highest average high temperature) is July (22.3°C).
The month with the lowest average high temperature is January (6.8°C).

The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is January (2.2°C).

Average pressure
London, United Kingdom

Average pressure - London, United Kingdom

The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).

Average wind speed
London, United Kingdom

Average wind speed - London, United Kingdom

The windiest month (with the highest average wind speed) is February (17.3km/h).
The calmest month (with the lowest average wind speed) is September (12.6km/h).

Average humidity
London, United Kingdom

Average humidity - London, United Kingdom

The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is August (72%).

Average rainfall
London, United Kingdom

Average rainfall - London, United Kingdom

The wettest month (with the highest rainfall) is June (45mm).
The driest month (with the least rainfall) is April (22mm).

Average rainfall days
London, United Kingdom

Average rainfall days - London, United Kingdom

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is September (9.8 days).

Average snowfall
London, United Kingdom

Average snowfall - London, United Kingdom

The month with the highest snowfall is February (16mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days
London, United Kingdom

Average snowfall days - London, United Kingdom

The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight / Average sunshine
London, United Kingdom

Average daylight / Average sunshine - London, 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 August (Average sunshine: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).

Average sunshine days
London, United Kingdom

Average sunshine days - London, United Kingdom

The month with the most sunshine days is September (18.1 days).
The month with the least sunshine days is June (12.2 days).

Average UV index
London, United Kingdom

Average UV index - London, United Kingdom

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 visibility
London, United Kingdom

Average visibility - London, United Kingdom

The months with the highest visibility are January, February, March, April, May, June, July, August, October and December (9km).
The months with the lowest visibility are September and November (8km).

London, United Kingdom

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