Sammamish, WA Weather & Climate Normals
Sammamish's real weather, in one number
Sammamish, WA scores 54/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Sammamish's hottest and coldest months
Sammamish's hottest month is Aug, averaging 65°F; its coldest is Dec, averaging 41°F, a 24.4°F swing across the year, a middling gap by national standards.
Sammamish's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 46°F | 36°F | 8.64in | 1.5in |
| Feb | 50°F | 35°F | 5.83in | 0.2in |
| Mar | 54°F | 37°F | 6.74in | 0.3in |
| Apr | 59°F | 40°F | 5.29in | 0in |
| May | 64°F | 46°F | 4.04in | 0in |
| Jun | 69°F | 51°F | 3.15in | 0in |
| Jul | 76°F | 54°F | 1.24in | 0in |
| Aug | 77°F | 54°F | 1.22in | 0in |
| Sep | 70°F | 49°F | 3.02in | 0in |
| Oct | 60°F | 44°F | 6.22in | 0in |
| Nov | 51°F | 38°F | 9.47in | 0.1in |
| Dec | 46°F | 36°F | 8.42in | 1.5in |
May, Jun, Jul, Aug, and Sep are the best time to see Sammamish at its mildest; the rest of the year, plan around Dec's cold.
Rain and snow in Sammamish
Sammamish averages 63.28in of precipitation a year across roughly 184 days with measurable rain or snow, and 3.6in of snow a year.
Where Sammamish ranks
Sammamish ranks 915 of 4876 US cities in this dataset for comfort score, and 66 of 125 within WA. About 66,474 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Snoqualmie Falls, WA US, 10.1 miles from Sammamish, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure