Climate averages 1991–2020
Wyoming weather
in August.
A warm, wet month: the 2nd warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Wyoming: daytime highs average 25.8°C and nights cool to about 17.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 92 mm of rain on roughly 11 days, which makes August a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 56 min on an average August day.
The nearest other city in this atlas is Grand Rapids (6 km away). In August its highs average 25.9°C, about as warm as Wyoming, with 92 mm of rain.
Among the 498 cities listed in the United States, Wyoming ranks joint 456th of 498 for the warmest August highs and joint 332nd of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Wyoming is 4.1°C cooler than that mean.
From August to September, average highs fall by 3.7°C to 22.1°C, and monthly rainfall falls from 92 mm to 79 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
Wyoming climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.1°C-8.1°C | -8.1°C | 62 | 10.5 | 9.49 h |
| February | 0.3°C-8.2°C | -8.2°C | 50 | 8.1 | 10.511 h |
| March | 6.2°C-3.3°C | -3.3°C | 63 | 9.3 | 11.912 h |
| April | 13.2°C3.0°C | 3.0°C | 101 | 12.1 | 13.413 h |
| May | 19.5°C9.6°C | 9.6°C | 108 | 11.9 | 14.615 h |
| June | 24.7°C15.3°C | 15.3°C | 95 | 11.3 | 15.315 h |
| July | 26.7°C17.8°C | 17.8°C | 96 | 10.8 | 15.015 h |
| August, selected | 25.8°C17.3°C | 17.3°C | 92 | 10.5 | 13.914 h |
| September | 22.1°C13.5°C | 13.5°C | 79 | 9.3 | 12.513 h |
| October | 15.0°C7.4°C | 7.4°C | 86 | 11.4 | 11.111 h |
| November | 7.7°C1.3°C | 1.3°C | 68 | 10.0 | 9.810 h |
| December | 1.9°C-3.8°C | -3.8°C | 60 | 10.8 | 9.19 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
- Grand Rapids in AugustUnited States · 6 kmHigh 25.9°C · Low 17.4°C · 92 mm rain
- Kalamazoo in AugustUnited States · 70 kmHigh 26.1°C · Low 17.3°C · 97 mm rain
- Lansing in AugustUnited States · 96 kmHigh 26.0°C · Low 17.2°C · 84 mm rain
- South Bend in AugustUnited States · 144 kmHigh 26.7°C · Low 17.7°C · 97 mm rain
- Flint in AugustUnited States · 165 kmHigh 25.9°C · Low 17.2°C · 76 mm rain
- Racine in AugustUnited States · 171 kmHigh 24.4°C · Low 20.8°C · 93 mm rain
- Ann Arbor in AugustUnited States · 176 kmHigh 26.0°C · Low 17.1°C · 83 mm rain
- Kenosha in AugustUnited States · 177 kmHigh 24.5°C · Low 20.9°C · 94 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 Wyoming) is explained once on the Wyoming year overview and on the Sources, method and limits page.
Grand Rapids lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.