Seattle in Summer — Weather & What to Expect
Summer in Seattle (June, July, August) averages daytime highs of 23.5°C and lows of 14.0°C, with around 88.1mm of rain across the season (16 rainy days in total). It includes some of the best months of the year to visit (June, July, August).
In the northern hemisphere, summer in Seattle covers June, July, August.
Summer in Seattle month by month
| Month | High | Low | Rain | Rainy days | Rating |
|---|---|---|---|---|---|
| June | 20.9°C | 12.3°C | 58.6mm | 9 | 10/10 |
| July | 24.6°C | 14.6°C | 8.0mm | 2 | 10/10 |
| August | 24.9°C | 15.2°C | 21.5mm | 5 | 10/10 |
What to pack for Seattle in summer
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
- Light waterproof layer
Frequently Asked Questions
Is summer a good time to visit Seattle?
Summer in Seattle rates around 10/10 — excellent time to visit. Average highs are 23.5°C with 88.1mm of rain across the season.
How hot is Seattle in summer?
Daytime highs average 23.5°C (74.3°F) across June, July, August, with nights around 14.0°C.
What months are summer in Seattle?
Seattle is in the northern hemisphere, so summer covers June, July, August.
See also: best time to visit Seattle · Seattle annual climate · Seattle in spring · Seattle in autumn · Seattle in winter
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Once you know what summer in Seattle looks like, find out exactly what to pack for Seattle at 247PackingList. For currency, language and country facts, see the United States guide at 247CountryInfo.
Summer in Seattle — what to pack
Travel clothing layers
Pack layers — temperatures can vary significantly between day and night.
Check Price →Check clothing sizes in United States at 247Sizing before you shop.
More summer travel essentials
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.