Tri-Cities Climate by Month
Tri-Cities, Washington, United States
Hot summers and cold winters, with little rain.
Hot summers and cold winters, with little rain: that's Tri-Cities's climate in short. Expect highs of 92°F (33°C) in July and 41°F (5°C) in December, with the coldest nights (December) near 28°F (-2°C). It gets only 7.3 in (185 mm) of rain a year. July to September are almost completely dry.
- Warmest month
- 92°F(33°C)
- Average high, July
- Coldest nights
- 28°F(-2°C)
- Average low, December
- Rain per year
- 7.3 in(185 mm)
- No clear rainy season
- Humidity
- 61%
- Sunniest: July
Best and worst months in Tri-Cities
Best for weatherMay is the best time for weather in Tri-Cities: highs near 76°F (24°C) and almost no rain.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 41°F (5°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 May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Tri-Cities weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 41°F(5°C) | 28°F(-2°C) | 1.0 in(25 mm) | 88% | 1.1 |
| FebFebruary | 48°F(9°C) | 30°F(-1°C) | 0.7 in(19 mm) | 74% | 2.2 |
| MarMarch | 58°F(15°C) | 35°F(2°C) | 0.7 in(19 mm) | 64% | 3.4 |
| AprApril | 67°F(19°C) | 41°F(5°C) | 0.4 in(11 mm) | 57% | 5.0 |
| MayMayBest | 76°F(24°C) | 49°F(9°C) | 0.6 in(14 mm) | 47% | 6.0 |
| JunJune | 82°F(28°C) | 55°F(13°C) | 0.4 in(11 mm) | 46% | 6.8 |
| JulJuly | 92°F(33°C) | 60°F(16°C) | 0.2 in(4 mm) | 39% | 7.3 |
| AugAugust | 91°F(33°C) | 58°F(14°C) | 0.2 in(5 mm) | 41% | 6.3 |
| SepSeptember | 81°F(27°C) | 50°F(10°C) | 0.2 in(6 mm) | 47% | 4.6 |
| OctOctober | 66°F(19°C) | 40°F(5°C) | 0.7 in(19 mm) | 65% | 2.7 |
| NovNovember | 50°F(10°C) | 34°F(1°C) | 0.9 in(23 mm) | 77% | 1.4 |
| DecDecember | 41°F(5°C) | 28°F(-2°C) | 1.1 in(29 mm) | 89% | 0.9 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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