🇬🇧 Weather in London in May
This is what the weather in London (United Kingdom) was like in May in 2017–2026.
Key facts at a glance
Avg. daytime high
17.9 °C
14.5 °C – 19.4 °C
Avg. night-time low
7.7 °C
5.9 °C – 8.9 °C
Avg. rain days in period
10.3
33 % of days · ≥ 1.0 mm
Avg. precipitation in period
44.0 mm
3.6 mm – 79.7 mm
Avg. cloud cover
67 %
This data source has no sunshine hours – average cloud cover shown instead.
Avg. sea temperature
–
No sea nearby – no sea temperature.
Extremes: Highest temperature 29.9 °C (26 May 2026) · Lowest temperature 0.0 °C (12 May 2020) · Avg. daily peak wind 22 km/h
Weather mix of all days
- 36Sunny
- 89Partly cloudy
- 82Cloudy
- 76Light rain
- 27Rain
Summary
- On average 17.9 °C during the day and 7.7 °C at night.
- On average 10.3 rain days (Rain day = at least 1.0 mm of precipitation) with 44.0 mm of precipitation in total.
- Prevailing: Partly cloudy.
- Warmest year: 2026 (avg. 19.4 °C), coolest: 2021 (avg. 14.5 °C).
- Wettest year: 2021 (79.7 mm), driest: 2020 (3.6 mm).
- Extremes: 29.9 °C on 26 May 2026 and 0.0 °C on 12 May 2020.
Overall values from all 10 years. How is this calculated?
Charts
Temperatures per year
Average over your travel period
Precipitation & rain days
Year by year
2026
Avg. max19.4°Avg. min8.7°- Rain days
- 7 Rain days
- Precipitation
- 21.3 mm
- Avg. cloud cover
- 67 % cloudy
- Sea temperature
- –
Max 29.9 °C · Min 1.5 °C
2025
Avg. max18.9°Avg. min7.8°- Rain days
- 6 Rain days
- Precipitation
- 20.9 mm
- Avg. cloud cover
- 58 % cloudy
- Sea temperature
- –
Max 24.2 °C · Min 3.2 °C
2024
Avg. max18.3°Avg. min8.9°- Rain days
- 17 Rain days
- Precipitation
- 74.7 mm
- Avg. cloud cover
- 75 % cloudy
- Sea temperature
- –
Max 22.9 °C · Min 5.3 °C
2023
Avg. max17.6°Avg. min7.4°- Rain days
- 9 Rain days
- Precipitation
- 42.3 mm
- Avg. cloud cover
- 67 % cloudy
- Sea temperature
- –
Max 20.3 °C · Min 4.0 °C
2022
Avg. max18.2°Avg. min8.2°- Rain days
- 11 Rain days
- Precipitation
- 48.2 mm
- Avg. cloud cover
- 74 % cloudy
- Sea temperature
- –
Max 23.1 °C · Min 4.2 °C
2021
Avg. max14.5°Avg. min5.9°- Rain days
- 19 Rain days
- Precipitation
- 79.7 mm
- Avg. cloud cover
- 75 % cloudy
- Sea temperature
- –
Max 21.6 °C · Min 1.1 °C
2020
Avg. max18.3°Avg. min6.7°- Rain days
- 1 Rain days
- Precipitation
- 3.6 mm
- Avg. cloud cover
- 50 % cloudy
- Sea temperature
- –
Max 24.4 °C · Min 0.0 °C
2019
Avg. max16.8°Avg. min6.8°- Rain days
- 9 Rain days
- Precipitation
- 35.6 mm
- Avg. cloud cover
- 73 % cloudy
- Sea temperature
- –
Max 22.3 °C · Min 1.8 °C
2018
Avg. max19.4°Avg. min7.6°- Rain days
- 11 Rain days
- Precipitation
- 48.4 mm
- Avg. cloud cover
- 56 % cloudy
- Sea temperature
- –
Max 24.4 °C · Min 1.4 °C
2017
Avg. max18.1°Avg. min8.5°- Rain days
- 13 Rain days
- Precipitation
- 65.6 mm
- Avg. cloud cover
- 74 % cloudy
- Sea temperature
- –
Max 23.7 °C · Min 3.0 °C
Frequently asked questions
- How warm is it in London in May?
- Daytime highs averaged 17.9 °C, night-time lows 7.7 °C. The highest value of the past 10 years was 29.9 °C (26 May 2026), the lowest 0.0 °C (12 May 2020).
- How often does it rain in London in May?
- On average there were 10.3 rain days (at least 1 mm) with 44.0 mm of precipitation in total.
Check your exact travel dates
Choose your travel period – we show the weather for exactly those days.
Other destinations in May
Data sources
- Weather data
- Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains. - Sea temperature
- MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis) - Place search
- Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)