Climate averages 1991–2020
Tri-Cities weather
in July.
A very hot, very dry month: the warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a very hot month in Tri-Cities: daytime highs average 34.2°C and nights cool to about 19.2°C. By daytime temperature it is the warmest month of the year.
Expect about 3.8 mm of rain on roughly 1 day, which makes July a very dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 15 h 24 min on an average July day.
The nearest other city in this atlas is Kennewick (6 km away). In July its highs average 34.1°C, about as warm as Tri-Cities, with 3.8 mm of rain.
Among the 498 cities listed in the United States, Tri-Cities ranks joint 56th of 498 for the warmest July highs and joint 95th of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Tri-Cities is 3.9°C warmer than that mean.
From July to August, average highs fall by 1.0°C to 33.2°C, and monthly rainfall rises from 3.8 mm to 4.2 mm.
The annual picture
July in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Tri-Cities climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.0°C-1.5°C | -1.5°C | 34 | 8.1 | 9.19 h |
| February | 9.3°C-0.3°C | -0.3°C | 23 | 6.2 | 10.310 h |
| March | 14.3°C2.8°C | 2.8°C | 24 | 5.9 | 11.912 h |
| April | 19.3°C6.6°C | 6.6°C | 17 | 4.9 | 13.514 h |
| May | 25.0°C11.5°C | 11.5°C | 18 | 4.5 | 15.015 h |
| June | 28.9°C15.3°C | 15.3°C | 13 | 2.8 | 15.716 h |
| July, selected | 34.2°C19.2°C | 19.2°C | 3.8 | 1.0 | 15.415 h |
| August | 33.2°C18.6°C | 18.6°C | 4.2 | 1.0 | 14.214 h |
| September | 27.5°C14.0°C | 14.0°C | 6.9 | 1.8 | 12.613 h |
| October | 18.9°C7.9°C | 7.9°C | 22 | 5.0 | 11.011 h |
| November | 10.7°C2.3°C | 2.3°C | 29 | 7.3 | 9.59 h |
| December | 5.6°C-1.2°C | -1.2°C | 35 | 8.4 | 8.79 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Kennewick in JulyUnited States · 6 kmHigh 34.1°C · Low 19.1°C · 3.8 mm rain
- Yakima in JulyUnited States · 108 kmHigh 31.0°C · Low 15.3°C · 3.3 mm rain
- Spokane in JulyUnited States · 207 kmHigh 29.7°C · Low 16.0°C · 13 mm rain
- Spokane Valley in JulyUnited States · 217 kmHigh 29.0°C · Low 15.3°C · 15 mm rain
- Auburn in JulyUnited States · 259 kmHigh 23.8°C · Low 13.5°C · 21 mm rain
- Kent in JulyUnited States · 263 kmHigh 24.2°C · Low 14.1°C · 25 mm rain
- Gresham in JulyUnited States · 264 kmHigh 25.5°C · Low 13.6°C · 14 mm rain
- Federal Way in JulyUnited States · 266 kmHigh 23.4°C · Low 13.3°C · 21 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Tri-Cities) is explained once on the Tri-Cities year overview and on the Sources, method and limits page.
Kennewick lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.