Seattle, WA weather by month
West · Station: Seattle-Tacoma International Airport (Sea-Tac), WA · NOAA 1991–2020 Climate Normals
The best time to visit Seattle, WA is May–September, when average daytime highs are comfortable and rainfall sits at or below the city's monthly average. Seattle is hottest in August (avg high 78°F) and coolest in December (avg high 47°F). The wettest month is November (6.3 in) and the driest is July (0.6 in). Overall the annual mean temperature is about 53.7°F with 39.5 in of precipitation a year and 6.3 in of snow.
Source: NOAA NCEI U.S. Climate Normals 1991–2020. Data as of June 2026.
Monthly weather averages for Seattle
| Month | Avg high (°F) | Avg low (°F) | Avg precip (in) | Avg snow (in) |
|---|---|---|---|---|
| January | 48 | 38 | 5.8 | 1.8 |
| February | 50 | 38 | 3.8 | 2.2 |
| March | 54 | 40 | 4.2 | 0.4 |
| April | 59 | 43 | 3.2 | 0 |
| May | 66 | 49 | 1.9 | 0 |
| June | 71 | 53 | 1.5 | 0 |
| July | 77 | 57 | 0.6 | 0 |
| August | 78 | 57 | 1 | 0 |
| September | 72 | 54 | 1.6 | 0 |
| October | 60 | 47 | 3.9 | 0 |
| November | 52 | 41 | 6.3 | 0.2 |
| December | 47 | 37 | 5.7 | 1.7 |
Source: NOAA NCEI U.S. Climate Normals 1991–2020. Data as of June 2026.
Best time to visit Seattle
Based on the normals above, the most pleasant window is May–September. In those months daytime highs are in the mild-to-warm range and precipitation is no higher than the city's typical month, so you avoid both the peak warm of August (when highs reach about 78°F — t-shirt weather; sunscreen advised) and the cool, darker conditions around December (highs near 47°F). Try to avoid November if rain would spoil your plans — it is the wettest month at 6.3 in. Use the packing & comfort tool to check any specific month.
How Seattle compares
Seattle's 39.5 in of annual precipitation and 53.7°F mean temperature put it in context with other US cities. See where it ranks for warmest in January, rainiest overall and driest overall, or browse the full list of cities.
Frequently asked questions
What is the best time to visit Seattle?
The most comfortable time to visit Seattle, WA is May–September, when average daytime highs are mild and rainfall is at or below the city's average. Seattle is hottest in August (avg high 78°F) and coolest in December (avg high 47°F), per NOAA 1991–2020 Climate Normals.
What is the average temperature in Seattle?
Seattle's annual mean temperature is about 53.7°F. The warmest month is August (average high 78°F, low 57°F) and the coolest is December (average high 47°F, low 37°F).
How much rain does Seattle get?
Seattle receives about 39.5 inches of precipitation a year. The wettest month is November (6.3 in) and the driest is July (0.6 in).
Does it snow in Seattle?
Yes. Seattle averages about 6.3 inches of snow a year. Snow normally falls between late autumn and early spring; summer months see none.
Source
Monthly averages from the NOAA NCEI U.S. Climate Normals 1991–2020, station Seattle-Tacoma International Airport (Sea-Tac), WA (reference values verified against the published normals). Climate normals describe a 30-year average, not a forecast; any individual year can differ. See our methodology for how "best time to visit" is derived.
Last updated: 2026-06-18