Seattle weather in August
Seattle in August averages 19°C (67°F) and 25 mm of rain.
Of the twelve months in Seattle, August is the warmest and the second driest.
- Average temp
- 19°C (67°F)
14–25°C · 57–77°F
- Rainfall
- 25 mm
Not much rain
- Sunshine
- —
- Wind
- 11 km/h
What is Seattle like in August?
Daytime
Days are mild.
Rain
Rain is usually light.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Seattle in August?
A layer for the evening
The day swings about 11°C between its low and its high.
August compared with July and September
August in Seattle is about the same temperature as July and 10 mm wetter than it, which averages 19°C (67°F).
August in Seattle is 2.8°C warmer than September and 16 mm drier than it, which averages 17°C (62°F).
Daylight in Seattle in August
On 15 August the sun is up for 14 hours 14 minutes in Seattle, rising about 06:06 and setting about 20:20 local time.
August ends 1 hour 32 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 1 hour 44 minutes short of June, the longest-lit month here.
Where to stay in Seattle
Dates are a starting point for August.
Travel guides for Seattle
What to read before you book.
Seattle weather by month
TemperatureRainfall
How August compares with the rest of the year
August is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 6°C / 42°F | 147 mm |
| February | 6°C / 43°F | 96 mm |
| March | 8°C / 46°F | 106 mm |
| April | 10°C / 51°F | 81 mm |
| May | 14°C / 57°F | 48 mm |
| June | 16°C / 62°F | 37 mm |
| July | 19°C / 67°F | 15 mm |
| August | 19°C / 67°F | 25 mm |
| September | 17°C / 62°F | 41 mm |
| October | 12°C / 53°F | 99 mm |
| November | 8°C / 46°F | 160 mm |
| December | 5°C / 41°F | 147 mm |
Check another month
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FAQs about Seattle in August
August climate averages for Seattle, 1991–2020.
Seattle averages 19°C (67°F) in August, ranging from about 14°C (57°F) at night to 25°C (77°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Barely. August sees only about 25 mm, so rain is unlikely to affect your plans.
Yes. August averages 19°C (67°F) against 17°C (62°F) in September — 2.8°C warmer.
August is about as warm as July, and about as wet.
Yes. August falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what August is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 14 hours 14 minutes of daylight in mid-August, against 15 hours 58 minutes in June and 8 hours 27 minutes in December.
On 15 August, sunrise is about 06:06 and sunset about 20:20 local time. Both shift across the month — the month ends 1 hour 32 minutes shorter than it starts.
