Summer temperatures · Washington
How hot does Seattle get in summer?
In a typical summer, June to August, Seattle averages highs around 75°F and lows around 56°F.
About 4 days a year reach 90°F or hotter, and a day at 100°F comes along less than once a year. About 31 days a year get to 80°F or warmer. That makes it the 11th coolest summer of the 129 US cities we track.
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The hottest high in the forecast for the next 48 hours is about 58°F.
Seattle averages summer highs around 75°F and only about 4 days a year at 90°F or hotter, so a hot day here is front-page news.
Live 48-hour forecast from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Summer at a glance
| Average summer high | 75°F |
|---|---|
| Average summer low | 56°F |
| Days a year at 80°F or warmer | 31 |
| Days a year at 90°F or hotter | 4 |
| Days a year at 100°F or hotter | fewer than one |
| Average winter high, for comparison | 48°F |
Summer here is June to August. Counts are averages a year.
Cities with about the same summer
- Eugene, Oregon: highs around 81°F, lows around 50°F
- Missoula, Montana: highs around 81°F, lows around 49°F
- Great Falls, Montana: highs around 80°F, lows around 49°F
More about the weather here
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00024233.