Seattle, USA: Annual Weather Averages
July is the hottest month in Seattle with an average temperature of 18°C (64°F) and the coldest is January at 5°C (41°F) with the most daily sunshine hours at 10 in July. The wettest month is December with an average of 150mm of rain. The best month to swim in the sea is in July when the average sea temperature is 14°C (57°F).
Average Temperature: Seattle
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 5 | 7 | 8 | 10 | 13 | 16 | 18 | 18 | 16 | 12 | 8 | 5 |
| °F | 41 | 45 | 46 | 50 | 55 | 61 | 64 | 64 | 61 | 54 | 46 | 41 |
Average High/Low Temperature: Seattle
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | 7 | 10 | 12 | 14 | 18 | 21 | 23 | 23 | 20 | 16 | 11 | 8 |
| Low °C | 2 | 3 | 3 | 5 | 8 | 11 | 13 | 13 | 11 | 8 | 5 | 2 |
| High °F | 45 | 50 | 54 | 57 | 64 | 70 | 73 | 73 | 68 | 61 | 52 | 46 |
| Low °F | 36 | 37 | 37 | 41 | 46 | 52 | 55 | 55 | 52 | 46 | 41 | 36 |
Average Rainfall: Seattle
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 147 | 104 | 98 | 70 | 53 | 48 | 24 | 34 | 51 | 90 | 145 | 150 |
| Days | 18 | 15 | 16 | 14 | 11 | 9 | 5 | 6 | 9 | 13 | 18 | 19 |
Average Daily Sunshine Hours: Seattle
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours | 2 | 4 | 5 | 7 | 8 | 9 | 10 | 9 | 7 | 5 | 2 | 2 |
Average Sea Temperature: Seattle
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 8 | 8 | 8 | 10 | 12 | 13 | 14 | 14 | 13 | 11 | 9 | 8 |
| °F | 46 | 46 | 46 | 50 | 54 | 55 | 57 | 57 | 55 | 52 | 48 | 46 |
