Seattle, WA Climate & Monthly Averages
The climate of Seattle
Seattle has a oceanic climate, marked by mild temperatures year-round with regular rainfall. Average daytime highs range from about 45°F (7°C) in December to around 77°F (25°C) in August, and the city records roughly 151 days of measurable precipitation a year.
Climate quick facts
- Hottest month: August - highs near 77°F (25°C)
- Coldest month: December - highs near 45°F (7°C)
- Record high: 100°F (38°C) · Record low: 14°F (-10°C) (2015–2024)
- Wettest month: December (19 rainy days) · Sunniest: July (12.7 h sun/day)
- Climate type: oceanic - mild temperatures year-round with regular rainfall
- Snow: about 7 days a year
Temperatures through the year
The warmest stretch of the year centers on August. Highs average 77°F (25°C) and overnight lows stay near 59°F (15°C). The coolest month is December, with typical highs of 45°F (7°C) and lows around 37°F (3°C). Based on 2015–2024 weather data, temperatures have reached as high as 100°F (38°C) and dropped as low as 14°F (-10°C).
Rain, sun and snow
December is usually the wettest month. It brings about 7.4 inches (189 mm) of rain over 19 days, while July is the driest. July brings the most sunshine, averaging 12.7 hours of sun a day. Snow falls on about 7 days in a typical year, mostly from December through March.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 47° | 37° | 18 | 7.3 in | 4.1 h/day | 84% |
| February | 47° | 36° | 15 | 4.9 in | 5.1 h/day | 82% |
| March | 52° | 39° | 15 | 4.3 in | 7.5 h/day | 80% |
| April | 57° | 42° | 14 | 3.3 in | 9.2 h/day | 77% |
| May | 64° | 49° | 10 | 2.1 in | 10.1 h/day | 74% |
| June | 70° | 54° | 8 | 2.0 in | 11.7 h/day | 70% |
| July | 76° | 58° | 3 | 0.6 in | 12.7 h/day | 66% |
| August | 77° | 59° | 5 | 1.1 in | 11.5 h/day | 68% |
| September | 69° | 55° | 10 | 2.5 in | 9.2 h/day | 76% |
| October | 59° | 48° | 14 | 5.0 in | 6.5 h/day | 82% |
| November | 50° | 41° | 18 | 6.9 in | 4.7 h/day | 83% |
| December | 45° | 37° | 19 | 7.4 in | 3.6 h/day | 84% |
Seattle month by month
Seattle weather in January
January brings highs around 47°F (8°C), lows near 37°F (3°C), about 18 wet days and roughly 1 snowy days.
Seattle weather in February
February brings highs around 47°F (8°C), lows near 36°F (2°C), about 15 wet days and roughly 2 snowy days.
Seattle weather in March
March brings highs around 52°F (11°C), lows near 39°F (4°C), about 15 wet days.
Seattle weather in April
April brings highs around 57°F (14°C), lows near 42°F (6°C), about 14 wet days.
Seattle weather in May
May brings highs around 64°F (18°C), lows near 49°F (9°C), about 10 wet days.
Seattle weather in June
June brings highs around 70°F (21°C), lows near 54°F (12°C), about 8 wet days.
Seattle weather in July
July brings highs around 76°F (25°C), lows near 58°F (15°C), about 3 wet days - typically the driest month and the sunniest month of the year in Seattle.
Seattle weather in August
August brings highs around 77°F (25°C), lows near 59°F (15°C), about 5 wet days - typically the hottest month of the year in Seattle.
Seattle weather in September
September brings highs around 69°F (20°C), lows near 55°F (13°C), about 10 wet days.
Seattle weather in October
October brings highs around 59°F (15°C), lows near 48°F (9°C), about 14 wet days.
Seattle weather in November
November brings highs around 50°F (10°C), lows near 41°F (5°C), about 18 wet days.
Seattle weather in December
December brings highs around 45°F (7°C), lows near 37°F (3°C), about 19 wet days and roughly 2 snowy days - typically the coldest month and the wettest month of the year in Seattle.
Seasons in Seattle
Spring (March through May)
Spring in Seattle is crisp but comfortable, with daytime highs averaging 58°F (14°C) and nights around 43°F (6°C); expect showers on roughly 39 days across the season.
Summer (June through August)
Summer in Seattle brings comfortable warmth, with daytime highs averaging 74°F (23°C) and nights around 57°F (14°C); rain falls on about 17 days over the three months.
Fall (September through November)
Fall in Seattle is crisp but comfortable, with daytime highs averaging 59°F (15°C) and nights around 48°F (9°C); expect showers on roughly 42 days across the season.
Winter (December through February)
Winter in Seattle runs cold, with daytime highs averaging 46°F (8°C) and nights around 37°F (3°C); expect showers on roughly 53 days across the season, plus around 6 snowy days.
Climate questions, answered
What is the average temperature in Seattle?
Is Seattle hot in summer?
Is Seattle cold in winter?
How many rainy days does Seattle get in a year?
Best time to visit Seattle
The best time to visit Seattle is generally May to September, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 71°F (22°C).
Pack for Seattle with a warm jacket and layers for the cooler season; a compact umbrella or rain shell - showers are a regular feature. Evenings can feel noticeably cooler than afternoons - August nights average 59°F (15°C).
Seattle temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.