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Seattle weather in August 2026
Expect daytime maximum temperatures of 75°F in Seattle, Washington State in August based on long-term weather averages. There are 9 hours of sunshine per day on average.
- 75°F max day temperature
75 - 9 hours of sunshine per day
- 6 days with some rainfall
6 - 55°F min night temperature
55 - 14 hours of daylight per day
14 - No heat & humidity
0 - 1.2 inches of monthly rainfall
1.2 - 6 (High) UV index
6
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The August weather guide for Washington State (Seattle) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C) | Imperial (°F)
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How hot is it in Seattle in August?
Daytime temperatures usually reach 75°F in Seattle in August, falling to 55°F at night.
How sunny is it in Seattle in August?
There are normally 9 hours of bright sunshine each day in Seattle in August - that's 63% of daylight hours.
Does it rain in Seattle in August?
There are usually 6 days with some rain in Seattle in August and the average monthly rainfall is 1.2 inches.
Seattle August sunrise & sunset times
Browse the sunrise and sunset times for Seattle in August 2026. Select a month to view Seattle sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Saturday, 1st August 2026 | 04:47 | 19:43 |
| Sunday, 16th August 2026 | 05:07 | 19:19 |
| Monday, 31st August 2026 | 05:27 | 18:51 |
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