Climate averages 1991–2020
Waukesha weather
in August.
A warm, wet month: the 2nd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Waukesha: daytime highs average 25.9°C and nights cool to about 18.1°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 90 mm of rain on roughly 10 days, which makes August a wet month (the 9th 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 Milwaukee (27 km away). In August its highs average 24.4°C, 1.5°C cooler than Waukesha, with 91 mm of rain.
Among the 498 cities listed in the United States, Waukesha ranks joint 447th of 498 for the warmest August highs and joint 322nd of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Waukesha is 4.0°C cooler than that mean.
From August to September, average highs fall by 3.9°C to 22.0°C, and monthly rainfall falls from 90 mm to 75 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
Waukesha climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.2°C-10.0°C | -10.0°C | 46 | 8.3 | 9.49 h |
| February | -0.3°C-8.6°C | -8.6°C | 45 | 7.1 | 10.510 h |
| March | 5.8°C-3.1°C | -3.1°C | 59 | 9.3 | 11.912 h |
| April | 12.3°C3.1°C | 3.1°C | 102 | 12.0 | 13.413 h |
| May | 18.9°C9.5°C | 9.5°C | 95 | 11.7 | 14.615 h |
| June | 24.5°C15.5°C | 15.5°C | 95 | 11.2 | 15.315 h |
| July | 27.0°C18.6°C | 18.6°C | 86 | 10.0 | 15.015 h |
| August, selected | 25.9°C18.1°C | 18.1°C | 90 | 10.3 | 13.914 h |
| September | 22.0°C14.2°C | 14.2°C | 75 | 8.6 | 12.513 h |
| October | 14.9°C7.6°C | 7.6°C | 72 | 8.8 | 11.111 h |
| November | 7.1°C0.6°C | 0.6°C | 55 | 8.1 | 9.810 h |
| December | 0.8°C-5.7°C | -5.7°C | 50 | 7.9 | 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
- Milwaukee in AugustUnited States · 27 kmHigh 24.4°C · Low 20.0°C · 91 mm rain
- Racine in AugustUnited States · 48 kmHigh 24.4°C · Low 20.8°C · 93 mm rain
- Kenosha in AugustUnited States · 58 kmHigh 24.5°C · Low 20.9°C · 94 mm rain
- Waukegan in AugustUnited States · 79 kmHigh 24.8°C · Low 21.0°C · 96 mm rain
- Madison in AugustUnited States · 95 kmHigh 26.1°C · Low 17.2°C · 95 mm rain
- Arlington Heights in AugustUnited States · 105 kmHigh 26.4°C · Low 19.0°C · 93 mm rain
- Elgin in AugustUnited States · 108 kmHigh 26.8°C · Low 18.2°C · 93 mm rain
- Rockford in AugustUnited States · 108 kmHigh 26.6°C · Low 17.7°C · 87 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 Waukesha) is explained once on the Waukesha year overview and on the Sources, method and limits page.