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London vs Seattle weather: climate comparison
Seattle is the warmer of the two, averaging 52°F (11°C) over the year against 52°F (11°C) in London. Seattle is wetter, with 50.2 in (1275 mm) of precipitation a year to London's 26.4 in (671 mm). Below: every month side by side, from 30 years of ERA5 data (1996–2025).
- Mean temperature
- 10.9°C London
10.9°C Seattle - Annual precipitation
- 671.0 mm London
1274.6 mm Seattle - Rainy days a year
- 128 London
154 Seattle - Sunshine per day
- 7.5 h London
8.3 h Seattle
Month by month
| Month | London | Seattle |
|---|---|---|
| January | 7.3°C | 7.3°C |
| February | 8.3°C | 8.4°C |
| March | 10.6°C | 10.6°C |
| April | 13.7°C | 13.4°C |
| May | 16.9°C | 16.9°C |
| June | 20.1°C | 20.0°C |
| July | 21.9°C | 24.0°C |
| August | 21.6°C | 24.2°C |
| September | 19.1°C | 20.4°C |
| October | 15.1°C | 14.6°C |
| November | 10.6°C | 9.8°C |
| December | 8.0°C | 6.9°C |
Year at a glance
| Measure | London | Seattle |
|---|---|---|
| Mean annual temperature | 10.9°C | 10.9°C |
| Warmest month (avg high) | Jul · 22°C | Aug · 24°C |
| Coldest month (avg low) | Jan · 2°C | Feb · 2°C |
| Annual range (warmest high − coldest low) | 20°C | 22°C |
| Annual precipitation | 671.0 mm | 1274.6 mm |
| Rainy days per year | 128 | 154 |
| Wettest / driest month | Nov / Mar | Nov / Jul |
| Average sunshine per day | 7.5 h | 8.3 h |
In short: Seattle is the warmest overall (10.9°C mean); Seattle gets the most precipitation (1274.6 mm a year); Seattle is the sunniest (8.3 h a day on average); London has the smallest swing between its warmest and coldest months.
Record high 1996–2025: London 37.9°C (2022-07-19), Seattle 37.9°C (2021-06-28). Record low: London -10.3°C (2021-02-11), Seattle -14.5°C (1996-01-30).
Source: Open-Meteo Historical Weather API (CC BY 4.0). Values are ERA5 reanalysis model data on a ~9–25 km grid, not readings from a weather station, so a single town’s thermometer can differ by a few degrees and local showers can be missed. Monthly means of daily ERA5 values, 1996–2025, for the grid cells nearest London (51.49, -0.16) and Seattle (47.63, -122.32).
Which months differ most?
The gap in average highs is widest in August, when Seattle runs 5°F / 3°C warmer, and narrowest in March (0°F / 0°C apart). The biggest rainfall difference is in November: Seattle gets 4.9 in (123 mm) more on average.
Add a third or fourth city, or swap in any other place, in the full comparison tool. For one city in depth, see the London climate and Seattle climate pages.
Compare London or Seattle with another city
Questions people ask
Is London warmer than Seattle?
Seattle is warmer on average: its mean annual temperature is 52°F (11°C) against 52°F (11°C) in London (ERA5, 1996–2025).
Which gets more rain, London or Seattle?
Seattle, with about 50.2 in (1275 mm) of precipitation a year and 154 days with at least 1 mm, compared with 26.4 in (671 mm) and 128 days in London.
Which is sunnier, London or Seattle?
Seattle averages more sunshine: 8.3 h a day against 7.5 h. Sunshine duration is modelled from cloud cover.
How reliable is this comparison?
Both cities use the same 30-year reanalysis, so differences are consistent. Absolute values describe a grid cell several kilometres wide and can differ by a degree or two from the airport station.