Seattle Climate: Weather by Month and Best Time to Visit
Best months for Seattle: July, August, September.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 8°C | 4°C | 176 mm | 18 | – | – | 4.0 |
| February | 10°C | 4°C | 122 mm | 14 | – | – | 5.0 |
| March | 12°C | 5°C | 139 mm | 17 | – | – | 4.9 |
| April | 15°C | 7°C | 114 mm | 16 | – | – | 5.6 |
| May | 18°C | 10°C | 76 mm | 13 | – | – | 6.8 |
| June | 21°C | 12°C | 60 mm | 10 | – | – | 7.6 |
| July | 25°C | 14°C | 25 mm | 5 | – | – | 8.4 |
| August | 25°C | 14°C | 32 mm | 5 | – | – | 8.4 |
| September | 22°C | 12°C | 67 mm | 8 | – | – | 7.9 |
| October | 16°C | 9°C | 134 mm | 15 | – | – | 5.9 |
| November | 11°C | 6°C | 192 mm | 18 | – | – | 4.3 |
| December | 8°C | 4°C | 178 mm | 18 | – | – | 4.0 |