Sammamish Climate by Month
Sammamish, Washington, United States
Warm summers and cool winters, with rain spread through the year.
Warm summers and cool winters, with rain spread through the year: that's Sammamish's climate in short. Afternoon highs range from 45°F (7°C) in December to 76°F (25°C) in August, and December nights average 35°F (1°C). About 47 in (1193 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 76°F(25°C)
- Average high, August
- Coldest nights
- 35°F(1°C)
- Average low, December
- Rain per year
- 47 in(1193 mm)
- No clear rainy season
- Humidity
- 73%
- Sunniest: July
Best and worst months in Sammamish
Best for weatherThe most comfortable weather comes in July and August, with highs around 76°F (24°C) and about 1.2 in (30 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 45°F (7°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Sammamish weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 46°F(8°C) | 35°F(2°C) | 6.3 in(160 mm) | 81% | 1.0 |
| FebFebruary | 49°F(10°C) | 35°F(2°C) | 4.2 in(106 mm) | 77% | 1.9 |
| MarMarch | 53°F(12°C) | 37°F(3°C) | 5.3 in(134 mm) | 78% | 2.7 |
| AprApril | 58°F(15°C) | 41°F(5°C) | 3.9 in(98 mm) | 66% | 4.1 |
| MayMay | 65°F(18°C) | 46°F(8°C) | 2.6 in(66 mm) | 66% | 5.2 |
| JunJune | 69°F(21°C) | 51°F(10°C) | 2.2 in(55 mm) | 68% | 5.4 |
| JulJulyBest | 76°F(24°C) | 55°F(13°C) | 1.0 in(26 mm) | 66% | 6.0 |
| AugAugustBest | 76°F(25°C) | 54°F(12°C) | 1.3 in(33 mm) | 66% | 5.2 |
| SepSeptember | 70°F(21°C) | 50°F(10°C) | 2.1 in(53 mm) | 73% | 3.8 |
| OctOctober | 60°F(16°C) | 44°F(6°C) | 4.8 in(122 mm) | 76% | 2.0 |
| NovNovember | 51°F(11°C) | 38°F(3°C) | 6.9 in(175 mm) | 80% | 1.1 |
| DecDecember | 45°F(7°C) | 35°F(1°C) | 6.5 in(165 mm) | 84% | 0.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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