Seattle, while frequently shrouded in grey clouds and mist, actually has much less precipitation than many other US cities, despite its soggy reputation. This constant greyness does make the city's otherwise moderate temperatures seem somehow bone-chilling. Winter highs range from 4°-10°C (40-50°F), while summer highs hover between between 24°-29°C (75-85°F). Summer days can be very pleasant, though cool, so take a light jacket.
| Month | Temp (°C) | Rainfall (mm) | Humidity (%) | Sunshine (hours) |
| Jan | 2 - 7 | 122 | 2 | |
| Feb | 3 - 9 | 94 | 4 | |
| Mar | 4 - 11 | 79 | 5 | |
| Apr | 6 - 14 | 58 | 7 | |
| May | 8 - 18 | 46 | 8 | |
| Jun | 11 - 21 | 36 | 8 | |
| Jul | 12 - 22 | 15 | 10 | |
| Aug | 13 - 23 | 18 | 8 | |
| Sep | 11 - 19 | 43 | 7 | |
| Oct | 8 - 15 | 74 | 4 | |
| Nov | 5 - 11 | 122 | 3 | |
| Dec | 3 - 8 | 142 | 2 |