Climate averages 1991–2020
Yakima weather
in September.
A warm, very dry month: the 4th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Yakima: daytime highs average 24.9°C and nights cool to about 10.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 8.4 mm of rain on roughly 2 days, which makes September a very dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 36 min on an average September day.
The nearest other city in this atlas is Tri-Cities (108 km away). In September its highs average 27.5°C, 2.6°C warmer than Yakima, with 6.9 mm of rain.
Among the 498 cities listed in the United States, Yakima ranks joint 318th of 498 for the warmest September highs and 108th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Yakima is 2.0°C cooler than that mean.
From September to October, average highs fall by 8.6°C to 16.4°C, and monthly rainfall rises from 8.4 mm to 30 mm.
The annual picture
September 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
Yakima climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.7°C-4.3°C | -4.3°C | 58 | 10.9 | 9.09 h |
| February | 6.0°C-2.9°C | -2.9°C | 42 | 7.5 | 10.310 h |
| March | 10.9°C-0.4°C | -0.4°C | 33 | 7.5 | 11.912 h |
| April | 15.6°C2.9°C | 2.9°C | 19 | 4.7 | 13.514 h |
| May | 21.4°C7.8°C | 7.8°C | 18 | 4.3 | 15.015 h |
| June | 25.6°C11.6°C | 11.6°C | 9.5 | 2.5 | 15.816 h |
| July | 31.0°C15.3°C | 15.3°C | 3.3 | 0.8 | 15.415 h |
| August | 30.2°C15.1°C | 15.1°C | 3.0 | 0.8 | 14.214 h |
| September, selected | 24.9°C10.7°C | 10.7°C | 8.4 | 1.9 | 12.613 h |
| October | 16.4°C5.1°C | 5.1°C | 30 | 5.5 | 10.911 h |
| November | 7.9°C-0.4°C | -0.4°C | 52 | 9.0 | 9.59 h |
| December | 2.5°C-4.0°C | -4.0°C | 66 | 11.0 | 8.69 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
September in nearby cities
- Tri-Cities in SeptemberUnited States · 108 kmHigh 27.5°C · Low 14.0°C · 6.9 mm rain
- Kennewick in SeptemberUnited States · 114 kmHigh 27.4°C · Low 13.9°C · 6.9 mm rain
- Auburn in SeptemberUnited States · 152 kmHigh 20.8°C · Low 11.3°C · 64 mm rain
- Kent in SeptemberUnited States · 157 kmHigh 21.2°C · Low 11.8°C · 67 mm rain
- Federal Way in SeptemberUnited States · 159 kmHigh 20.3°C · Low 11.2°C · 64 mm rain
- Renton in SeptemberUnited States · 162 kmHigh 21.1°C · Low 11.6°C · 67 mm rain
- Tacoma in SeptemberUnited States · 164 kmHigh 20.8°C · Low 11.9°C · 50 mm rain
- Bellevue in SeptemberUnited States · 170 kmHigh 20.7°C · Low 11.3°C · 67 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 Yakima) is explained once on the Yakima year overview and on the Sources, method and limits page.