Seattle Climate by Month
Seattle, Washington, United States
Warm summers and cool winters, with rain spread through the year.
Seattle has warm summers and cool winters, with rain spread through the year. August is the warmest month, with highs around 76°F (24°C); December is the coolest at 46°F (8°C), and nights dip to 36°F (2°C). About 38 in (974 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 76°F(24°C)
- Average high, August
- Coldest nights
- 36°F(2°C)
- Average low, December
- Rain per year
- 38 in(974 mm)
- No clear rainy season
- Humidity
- 73%
- Sunniest: July
Best and worst months in Seattle
Best for weatherThe most comfortable weather comes in July and August, with highs around 76°F (24°C) and about 0.9 in (24 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 46°F (8°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Seattle weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 47°F(8°C) | 37°F(3°C) | 5.4 in(136 mm) | 78% | 1.0 |
| FebFebruary | 49°F(10°C) | 37°F(3°C) | 3.5 in(90 mm) | 74% | 1.9 |
| MarMarch | 53°F(12°C) | 39°F(4°C) | 4.4 in(111 mm) | 77% | 2.7 |
| AprApril | 58°F(14°C) | 42°F(6°C) | 3.0 in(75 mm) | 74% | 4.1 |
| MayMay | 65°F(18°C) | 48°F(9°C) | 1.8 in(45 mm) | 65% | 5.1 |
| JunJune | 70°F(21°C) | 52°F(11°C) | 1.6 in(40 mm) | 66% | 5.4 |
| JulJulyBest | 75°F(24°C) | 56°F(13°C) | 0.7 in(19 mm) | 65% | 5.9 |
| AugAugustBest | 76°F(24°C) | 56°F(13°C) | 1.1 in(28 mm) | 65% | 5.1 |
| SepSeptember | 70°F(21°C) | 52°F(11°C) | 1.6 in(40 mm) | 71% | 3.7 |
| OctOctober | 60°F(15°C) | 45°F(7°C) | 3.7 in(95 mm) | 82% | 1.9 |
| NovNovember | 51°F(11°C) | 40°F(5°C) | 5.7 in(146 mm) | 77% | 1.1 |
| DecDecember | 46°F(8°C) | 36°F(2°C) | 5.9 in(149 mm) | 79% | 0.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
All 20 places like Seattle →- 🇺🇸Mount VernonWashington, United States · Pop. 34k99%matchSame summer highsSame winter lowsSeattle vs Mount Vernon →
- 🇨🇦NanaimoBritish Columbia, Canada · Pop. 91k97%matchSame summer highsSame sunshineSeattle vs Nanaimo →
- 🇺🇸PortlandOregon, United States · Pop. 653k95%matchSame winter lowsSimilar rainfallSeattle vs Portland →
- 🇨🇦VancouverBritish Columbia, Canada · Pop. 662k95%matchSame winter lowsSame summer highsSeattle vs Vancouver →
- 🇨🇦Campbell RiverBritish Columbia, Canada · Pop. 33k93%matchSame winter lowsSame humiditySeattle vs Campbell River →