WeatherArchive / Climate averages / Seattle
Seattle climate: average weather by month
Seattle averages 52°F (11°C) over the year. August is warmest, with highs around 75°F (24°C); February is coldest, with lows near 35°F (2°C). About 50 inches (1275 mm) of precipitation falls on roughly 154 days a year, from 30 years of ERA5 data (1996–2025).
| Month | Avg high | Avg low | Precip. | Days ≥1 mm | Sunshine / day |
|---|---|---|---|---|---|
| January | 7.3°C | 2.0°C | 177.3 mm | 18.5 | 4.3 h |
| February | 8.4°C | 1.7°C | 117.9 mm | 14.6 | 6.0 h |
| March | 10.6°C | 3.3°C | 134.9 mm | 17.5 | 7.4 h |
| April | 13.4°C | 5.0°C | 97.4 mm | 14.3 | 9.6 h |
| May | 16.9°C | 8.3°C | 73.7 mm | 12.0 | 10.5 h |
| June | 20.0°C | 11.3°C | 54.1 mm | 8.9 | 11.6 h |
| July | 24.0°C | 13.9°C | 20.8 mm | 4.3 | 12.9 h |
| August | 24.2°C | 14.3°C | 32.3 mm | 4.9 | 11.8 h |
| September | 20.4°C | 11.8°C | 64.4 mm | 8.8 | 9.8 h |
| October | 14.6°C | 8.0°C | 129.5 mm | 14.4 | 6.8 h |
| November | 9.8°C | 4.4°C | 190.2 mm | 17.9 | 4.8 h |
| December | 6.9°C | 2.1°C | 182.1 mm | 18.3 | 4.0 h |
Record high 1996–2025: 37.9°C on 2021-06-28. Record low: -14.5°C on 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. Grid cell 47.63, -122.32 at 59 m. For snowfall, humidity and a best-time-to-visit score, open Seattle in the climate tool.