London weather in May
In May, London has an average high of 17 °C63 °F and an average low of 8 °C46 °F, with about 55 mm2.1 in of precipitation. It is the 5th warmest month of the year and ranks 8th for precipitation.
How May compares with other months
Compared with April, May is 3.2 °C5.9 °F warmer on average and wetter by 13 mm0.5 in. Compared with June, May is 3.2 °C5.8 °F cooler on average. Daylight lasts about 15.6 hours around the middle of the month. Average relative humidity is 79% and the average cloud amount 71%.
Is May a good time to visit London?
May is not among the most comfortable months by our comfort score: it is cool (average high 17 °C63 °F). The most comfortable months in London are June–September.
What to wear in May
For London in May, pack long sleeves, a sweater and a medium jacket.
May in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| London | 1763 | 846 | 552.1 |
| Bexley | 1763 | 846 | 552.1 |
| Slough | 1763 | 846 | 572.2 |
| Crawley | 1660 | 847 | 532.1 |
| Luton | 1762 | 744 | 592.3 |
| Southend-on-Sea | 1661 | 847 | 512.0 |
| Reading | 1763 | 745 | 582.3 |
| Basingstoke | 1762 | 745 | 582.3 |
| Milton Keynes | 1762 | 744 | 592.3 |
Other months in London
- 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
Frequently asked questions
How warm is London in May?
In May the average high in London is 17 °C (63 °F) and the average low is 8 °C (46 °F).
Does it rain a lot in London in May?
On average about 55 mm (2.1 in) of precipitation falls in May; it ranks 8th of the 12 months.
Is May the warmest month in London?
No. The warmest month in London is July, with an average high of 23 °C (73 °F). The coldest month is February, with an average low of 1 °C (35 °F).
How long is the day in London in May?
In the middle of May the day in London lasts about 15.6 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is London in May?
The average relative humidity in May is about 79%. This is a long-term average for the whole day.
How cloudy is London in May?
On average about 71% of the sky is covered by cloud in May. This is the mean cloud amount from satellite data, not the number of sunny days.
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.