London climate
London (England, United Kingdom) has a temperate oceanic climate (Köppen Cfb). The average temperature over the year is 11 °C51 °F, and about 709 mm28 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
London climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 745 | 235 | 440 | 652.6 | 11 |
| Feb | 846 | 135 | 540 | 542.1 | 11 |
| Mar | 1051 | 236 | 644 | 502.0 | 7 |
| Apr | 1457 | 540 | 949 | 421.6 | 2 |
| May | 1763 | 846 | 1355 | 552.1 | 0 |
| Jun | 2169 | 1152 | 1660 | 562.2 | 0 |
| Jul | 2373 | 1355 | 1864 | 602.3 | 0 |
| Aug | 2373 | 1355 | 1864 | 662.6 | 0 |
| Sep | 2068 | 1050 | 1559 | 441.7 | 0 |
| Oct | 1560 | 846 | 1253 | 732.9 | 0 |
| Nov | 1151 | 540 | 846 | 742.9 | 3 |
| Dec | 846 | 337 | 541 | 712.8 | 8 |
| Year | 2373 | 135 | 1151 | 70928 | 42 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 93% | 75% | 0.8 | 8:19 |
| Feb | 90% | 75% | 1.5 | 9:53 |
| Mar | 86% | 73% | 2.6 | 11:42 |
| Apr | 81% | 68% | 4.0 | 13:47 |
| May | 79% | 71% | 4.9 | 15:35 |
| Jun | 78% | 72% | 5.3 | 16:36 |
| Jul | 76% | 69% | 5.1 | 16:11 |
| Aug | 78% | 72% | 4.2 | 14:35 |
| Sep | 81% | 68% | 3.2 | 12:33 |
| Oct | 87% | 73% | 1.9 | 10:33 |
| Nov | 92% | 75% | 1.0 | 8:45 |
| Dec | 94% | 76% | 0.7 | 7:51 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of London is like
The warmest month is July, with an average high of 23 °C73 °F and a low of 13 °C55 °F. The coldest is January, when highs average 7 °C45 °F and lows 2 °C35 °F. There is a clear seasonal cycle, with 13.5 °C24.3 °F between the average temperature of the warmest and the coolest month.
Annual precipitation is moderate at about 709 mm28 in. Rain is spread fairly evenly through the year. The wettest month is November (74 mm2.9 in), the driest is April (42 mm1.6 in).
Relative humidity ranges from 76% in July to 94% in December. The clearest skies (lowest average cloud amount, 68%) are typical of September. Average wind speed near the ground ranges from 11 km/h (7 mph) in June to 14 km/h (9 mph) in February. Daylight lasts from about 7.9 hours in December to 16.6 hours in June.
Best time to visit London
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–September: average highs of 20 °C68 °F to 23 °C73 °F with 44 mm1.7 in to 66 mm2.6 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 7 °C45 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
London weather by month
- January7 °C45 °F / 2 °C35 °F
- February8 °C46 °F / 1 °C35 °F
- March10 °C51 °F / 2 °C36 °F
- April14 °C57 °F / 5 °C40 °F
- May17 °C63 °F / 8 °C46 °F
- June21 °C69 °F / 11 °C52 °F
- July23 °C73 °F / 13 °C55 °F
- August23 °C73 °F / 13 °C55 °F
- September20 °C68 °F / 10 °C50 °F
- October15 °C60 °F / 8 °C46 °F
- November11 °C51 °F / 5 °C40 °F
- December8 °C46 °F / 3 °C37 °F
What to pack for London
- Winter (December–February) — highs 745 to 8 °C46 °F, lows 135 to 3 °C37 °F, about 63 mm2.5 in of precipitation a month. Pack a warm coat, layers and closed shoes.
- Spring (March–May) — highs 1051 to 17 °C63 °F, lows 236 to 8 °C46 °F, about 49 mm1.9 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Summer (June–August) — highs 2169 to 23 °C73 °F, lows 1152 to 13 °C55 °F, about 60 mm2.4 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Autumn (September–November) — highs 1151 to 20 °C68 °F, lows 540 to 10 °C50 °F, about 64 mm2.5 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
How London compares
Of the 66 places in the United Kingdom covered by World Climates, London is the 19th warmest by annual mean temperature and the 60th wettest by annual precipitation. See all of them on the United Kingdom climate page.
Places in other countries with the most similar temperature and rainfall pattern: Rouen (France, Cfb), Brugge (Belgium, Cfb) and Amiens (France, Cfb).
The same NASA POWER grid cell also contains Islington (pop. 319,143), City of Westminster (pop. 247,614), Archway (pop. 215,667), Sutton (pop. 187,600), Croydon (pop. 173,314), Enfield Town (pop. 156,858), Tottenham (pop. 130,000) and Walthamstow (pop. 109,424). Their long-term averages in this dataset are essentially the same as for London, so they do not have separate pages.
Nearby places
- Bexley 20 km · 11 °C51 °F · 709 mm28 in
- Slough 33 km · 11 °C51 °F · 736 mm29 in
- Crawley 44 km · 11 °C51 °F · 765 mm30 in
- Luton 46 km · 10 °C50 °F · 712 mm28 in
- Southend-on-Sea 58 km · 11 °C51 °F · 681 mm27 in
- Reading 59 km · 10 °C51 °F · 752 mm30 in
- Basingstoke 72 km · 10 °C50 °F · 752 mm30 in
- Milton Keynes 73 km · 10 °C50 °F · 712 mm28 in
Frequently asked questions
What is the warmest month in London?
July is the warmest month in London, with an average high of 23 °C (73 °F) and an average low of 13 °C (55 °F).
What is the coldest month in London?
January is the coldest month, with an average high of 7 °C (45 °F) and an average low of 2 °C (35 °F).
When does it rain the most in London?
November is the wettest month with about 74 mm (2.9 in) of precipitation; April is the driest with about 42 mm (1.6 in).
What is the best time to visit London?
Judging by long-term averages, the most comfortable months are June–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.