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Kennewick Weather by Month
Average temperatures, rainfall and humidity for Kennewick, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Kennewick month looks like before you travel — then check the live Kennewick forecast for the days ahead.
Warmest month
July
31°C average high
Coolest month
January
-4°C average low
Wettest month
October
37 mm of rain
Driest month
July
5 mm of rain
Average temperature and rainfall in Kennewick by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 2°C | -4°C | -24°C / 15°C | 19 mm | 84% | 5 km/h |
| February | 5°C | -3°C | -17°C / 15°C | 13 mm | 74% | 7 km/h |
| March | 10°C | 0°C | -15°C / 22°C | 18 mm | 64% | 8 km/h |
| April | 15°C | 3°C | -5°C / 28°C | 18 mm | 53% | 11 km/h |
| May | 22°C | 8°C | -1°C / 34°C | 18 mm | 51% | 11 km/h |
| June | 25°C | 11°C | -1°C / 45°C | 15 mm | 48% | 11 km/h |
| July | 31°C | 15°C | 5°C / 41°C | 5 mm | 40% | 12 km/h |
| August | 30°C | 15°C | 6°C / 40°C | 7 mm | 43% | 11 km/h |
| September | 24°C | 11°C | 0°C / 38°C | 19 mm | 52% | 9 km/h |
| October | 16°C | 5°C | -18°C / 31°C | 37 mm | 64% | 7 km/h |
| November | 7°C | 1°C | -13°C / 18°C | 32 mm | 77% | 6 km/h |
| December | 2°C | -3°C | -22°C / 18°C | 20 mm | 83% | 6 km/h |
Best time to visit Kennewick
The most comfortable time to visit Kennewick is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around October, totalling about 220 mm a year.
Travellers who prefer heat should aim for July, when highs average 31°C. October is the month to avoid if rain would spoil your plans — it averages 37 mm, roughly 8× the rainfall of the driest month (July).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Kennewick forecast for what is happening now.