Climate
Sammamish weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: June, July, August, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 48°F | 37°F | 4.9 in | 18 |
| February | 50°F | 37°F | 3.2 in | 16 |
| March | 55°F | 40°F | 3.7 in | 18 |
| April | 60°F | 43°F | 2.8 in | 14 |
| May | 66°F | 49°F | 1.9 in | 11 |
| June | 71°F | 54°F | 1.5 in | 9 |
| July | 77°F | 58°F | 0.60 in | 4 |
| August | 78°F | 57°F | 0.90 in | 5 |
| September | 72°F | 53°F | 1.5 in | 9 |
| October | 61°F | 46°F | 3.5 in | 15 |
| November | 52°F | 40°F | 5.6 in | 17 |
| December | 47°F | 37°F | 4.5 in | 17 |
NOAA U.S. Climate Normals 1991–2020, Renton Muni Ap, Wa Us (10.9 mi away, 29 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in Sammamish?
August, with an average high of 78°F and low of 57°F.
What is the coldest month in Sammamish?
December, with an average low of 37°F and high of 47°F.
When does it rain most in Sammamish?
November is the wettest month, averaging 5.6 in of precipitation; the year totals about 34.6 inches.
What is the best time to visit Sammamish?
For mild weather (highs between 65°F and 85°F) with the least rain, June, July, August.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the Renton Muni Ap weather station, 10.9 miles from downtown: 30-year averages, not a forecast.