Waukesha Climate by Month
Waukesha, Wisconsin, United States
Warm summers and freezing winters, with rain spread through the year.
The climate in Waukesha is one of warm summers and freezing winters, with rain spread through the year. Afternoon highs range from 28°F (-2°C) in January to 83°F (28°C) in July, and January nights average 12°F (-11°C). It gets 34 in (874 mm) of rain a year, spread across the months.
- Warmest month
- 83°F(28°C)
- Average high, July
- Coldest nights
- 12°F(-11°C)
- Average low, January
- Rain per year
- 34 in(874 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in Waukesha
Best for weatherThe most comfortable weather comes in June and September, with highs around 76°F (24°C) and about 4.0 in (102 mm) of rain a month.
Least pleasantJanuary and February are the least pleasant; January is the coldest, with highs of only 28°F (-2°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Waukesha weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 28°F(-2°C) | 12°F(-11°C) | 1.4 in(36 mm) | 80% | 1.4 |
| FebFebruary | 33°F(1°C) | 16°F(-9°C) | 1.4 in(36 mm) | 90% | 2.4 |
| MarMarch | 44°F(7°C) | 26°F(-3°C) | 2.0 in(52 mm) | 73% | 3.5 |
| AprApril | 56°F(13°C) | 36°F(2°C) | 3.6 in(92 mm) | 67% | 4.5 |
| MayMay | 68°F(20°C) | 46°F(8°C) | 3.5 in(90 mm) | 68% | 5.2 |
| JunJuneBest | 78°F(26°C) | 56°F(13°C) | 4.3 in(109 mm) | 71% | 5.8 |
| JulJuly | 83°F(28°C) | 61°F(16°C) | 3.7 in(95 mm) | 71% | 6.0 |
| AugAugust | 80°F(27°C) | 60°F(15°C) | 3.8 in(97 mm) | 76% | 5.1 |
| SepSeptemberBest | 74°F(23°C) | 52°F(11°C) | 3.7 in(94 mm) | 72% | 4.2 |
| OctOctober | 61°F(16°C) | 40°F(5°C) | 2.9 in(74 mm) | 72% | 2.6 |
| NovNovember | 46°F(8°C) | 29°F(-1°C) | 2.1 in(53 mm) | 78% | 1.6 |
| DecDecember | 33°F(1°C) | 19°F(-7°C) | 1.8 in(46 mm) | 84% | 1.2 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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