Climate averages 1991–2020
Spokane Valley weather
in August.
A hot, very dry month: the 2nd warmest and the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Spokane Valley: daytime highs average 28.7°C and nights cool to about 15.1°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 14 mm of rain on roughly 3 days, which makes August a very dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 17 min on an average August day.
The nearest other city in this atlas is Spokane (14 km away). In August its highs average 29.3°C, 0.6°C warmer than Spokane Valley, with 12 mm of rain.
Among the 498 cities listed in the United States, Spokane Valley ranks joint 294th of 498 for the warmest August highs and joint 128th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Spokane Valley is 1.2°C cooler than that mean.
From August to September, average highs fall by 5.5°C to 23.2°C, and monthly rainfall rises from 14 mm to 22 mm.
The annual picture
August in context
Monthly precipitation
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
Spokane Valley climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.9°C-4.9°C | -4.9°C | 78 | 13.3 | 8.99 h |
| February | 4.6°C-4.0°C | -4.0°C | 54 | 10.7 | 10.210 h |
| March | 9.1°C-1.2°C | -1.2°C | 70 | 12.8 | 11.912 h |
| April | 13.7°C2.2°C | 2.2°C | 58 | 11.0 | 13.614 h |
| May | 19.2°C7.0°C | 7.0°C | 51 | 8.6 | 15.115 h |
| June | 23.0°C10.9°C | 10.9°C | 37 | 6.6 | 15.916 h |
| July | 29.0°C15.3°C | 15.3°C | 15 | 3.0 | 15.616 h |
| August, selected | 28.7°C15.1°C | 15.1°C | 14 | 2.6 | 14.314 h |
| September | 23.2°C10.5°C | 10.5°C | 22 | 4.4 | 12.613 h |
| October | 14.7°C4.5°C | 4.5°C | 52 | 8.5 | 10.911 h |
| November | 6.5°C-0.7°C | -0.7°C | 83 | 13.2 | 9.49 h |
| December | 1.7°C-4.3°C | -4.3°C | 85 | 12.8 | 8.59 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
August in nearby cities
- Spokane in AugustUnited States · 14 kmHigh 29.3°C · Low 15.7°C · 12 mm rain
- Kennewick in AugustUnited States · 217 kmHigh 33.0°C · Low 18.5°C · 4.2 mm rain
- Tri-Cities in AugustUnited States · 217 kmHigh 33.2°C · Low 18.6°C · 4.2 mm rain
- Missoula in AugustUnited States · 261 kmHigh 28.6°C · Low 14.9°C · 19 mm rain
- Yakima in AugustUnited States · 274 kmHigh 30.2°C · Low 15.1°C · 3.0 mm rain
- Kelowna in AugustCanada · 296 kmHigh 27.8°C · Low 16.5°C · 25 mm rain
- Bellevue in AugustUnited States · 372 kmHigh 24.1°C · Low 13.9°C · 33 mm rain
- Everett in AugustUnited States · 372 kmHigh 23.1°C · Low 13.6°C · 43 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 Spokane Valley) is explained once on the Spokane Valley year overview and on the Sources, method and limits page.