WeatherArchive / Climate averages / Seattle
Seattle weather by month: climate averages
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.
Seattle weather month by month
The wettest month in Seattle is November, averaging 7.5 in (190 mm); the driest is July at 0.8 in (21 mm). January has the most days with at least 1 mm of rain (about 19). July is the sunniest month, with about 12.9 hours of sunshine a day, against 4.0 hours in December. If you like average highs between 64 °F and 82 °F (18–28 °C) with few rainy days, aim for July, August and September.
Planning a particular day? See how often that date was wet or hot over 30 years with the event weather odds, or look up what the weather actually was on any past date in the historical weather archive.
Questions people ask
What is the warmest month in Seattle?
August, with an average daily high of 75°F (24°C) over 1996–2025.
What is the coldest month in Seattle?
February, when nights average about 35°F (2°C).
What is the rainiest month in Seattle?
November has the most precipitation (about 7.5 in (190 mm)), and January has the most rainy days (about 19 days with 1 mm or more). The driest month is July.
How much sunshine does Seattle get?
About 8.3 hours of bright sunshine a day averaged over the year, from 4.0 h in December to 12.9 h in July. Sunshine here is the model’s estimate of hours with direct sun, not hours of daylight.
What is the best month to visit Seattle for mild weather?
By average high between 64 °F and 82 °F (18–28 °C) and the fewest rainy days: July, August, September. Prices, crowds and events are not included.