London weather in May
May in London: cool, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in London · #200 of 604 destinations to visit in May · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
London climate normals — May
| Daytime high | 17°C / 62°F | 🙂 cool |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Feels like (high) | 15°C / 59°F | |
| Rainfall | 46 mm / 1.8 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 9°C / 47°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 15.6 h | |
| Wind | 19 km/h / 11 mph | |
| Air quality (US AQI) | 46 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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London in May — FAQ
- Is May a good time to visit London?
- May in London: cool, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for London on SeasonMap's comfort score (85/100).
- What is the weather like in London in May?
- In May, London averages a daily high of 16.8°C and a low of 8°C, with about 46 mm of rain over roughly 9.4 rainy days.
- What is the air quality in London in May?
- London has a mean US Air Quality Index of about 46 in May.