WA · climate averages
Seattle Weather by Month
These are climate averages, not a forecast. Station Seattle Sand Pt WSFO (USW00094290), 5.5 miles from downtown, elevation 60 ft.
Seattle's warmest month is August (avg high 77.0°F), coldest are February and December (avg low 37.0°F) and wettest is November (5.85 in), per NOAA 1991–2020 climate normals.
- Warmest high August 77.0°F
- Coldest low February and December 37.0°F
- Wettest month November 5.85 in
- Year of rain 12 months 37.82 in
Monthly Averages
Seattle's 12 monthly precipitation normals add up to 37.82 inches a year.
July is the driest month, with a precipitation normal of 0.78 inches.
January, February, November and December are the months with a snowfall normal above 0.1 inch, and they sum to 3.8 inches.
Seattle averages 163.0 days a year with at least 0.01 inch of precipitation.
| Month | Avg high | Avg low | Precipitation | Days ≥ 0.01 in | Snow |
|---|---|---|---|---|---|
| January | 47.4°F | 37.2°F | 5.14 in | 18.5 | 0.9 in |
| February | 49.8°F | 37.0°F | 3.54 in | 15.7 | 1.0 in |
| March | 53.9°F | 39.2°F | 3.86 in | 18.0 | 0.0 in |
| April | 58.8°F | 42.8°F | 2.98 in | 15.6 | 0.0 in |
| May | 65.3°F | 48.3°F | 2.16 in | 12.2 | 0.0 in |
| June | 70.2°F | 52.7°F | 1.57 in | 10.5 | 0.0 in |
| July | 76.5°F | 56.5°F | 0.78 in | 5.4 | 0.0 in |
| August | 77.0°F | 57.1°F | 1.00 in | 5.6 | 0.0 in |
| September | 71.3°F | 53.2°F | 1.74 in | 8.8 | 0.0 in |
| October | 60.5°F | 46.7°F | 3.65 in | 14.5 | 0.0 in |
| November | 51.9°F | 40.9°F | 5.85 in | 18.6 | 0.2 in |
| December | 46.5°F | 37.0°F | 5.55 in | 19.6 | 1.7 in |
Warmest, Coldest and Wettest Months
The warmest month is August, with an average high of 77.0°F.
February and December tie for the coldest month, with an average low of 37.0°F.
The wettest month is November, at 5.85 inches of precipitation over about 18.6 days.
No month in Seattle reaches an average high of 80°F. The highest is 77.0°F in August.
The range from the lowest average low to the highest average high in Seattle is 40.0°F.
In August, the average high in Seattle is 19.9°F above the average low.
Best Months to Visit Seattle for Weather
May, June, July, August and September meet the weather rule on this page: an average high from 65 to 85°F and precipitation below 3.15 inches.
The rule keeps a month when the average high is from 65 to 85°F and precipitation is below 3.15 inches, the mean of the twelve monthly precipitation normals.
- May · 65.3°F
- June · 70.2°F
- July · 76.5°F
- August · 77.0°F
- September · 71.3°F
Nearby cities
Portland is the closest other city on this site, 144.0 miles away. Its July average high is 81.9°F, 5.4°F warmer than Seattle.
| City | Miles | Avg high | Avg low | Precipitation |
|---|---|---|---|---|
| Portland | 144.0 | 81.9°F | 58.5°F | 0.51 in |
About This Data
Source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991–2020. Station: SEATTLE SAND PT WSFO (USW00094290), 5.5 mi from downtown, elevation 60 ft. Climate normals are 30-year averages, not forecasts. MonthSky is not affiliated with NOAA.
Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/wck8-er13. Accessed 2026-10-21.
U.S. Government work.
NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
These pages are built automatically from public NOAA data.
U.S. Monthly Climate Normals (1991-2020) dataset
NCEI dataset landing page for the monthly normals
FAQ
What is the hottest month in Seattle?
August is the warmest, with an average high of 77.0°F.
What is the wettest month in Seattle?
November is the wettest, at 5.85 inches over about 18.6 days.
How many rainy days does Seattle get a year?
The monthly counts of days with at least 0.01 inch of precipitation add up to 163.0 days.
When is the best time to visit Seattle for weather?
May, June, July, August and September meet the rule used on this page: average high from 65 to 85°F and precipitation below the monthly mean of 3.15 inches.