Sun Prairie Climate by Month
Sun Prairie, Wisconsin, United States
Warm summers and freezing winters, with rain spread through the year.
The climate in Sun Prairie is one of warm summers and freezing winters, with rain spread through the year. Expect highs of 83°F (28°C) in July and 27°F (-3°C) in January, with the coldest nights (January) near 10°F (-12°C). About 34 in (863 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 83°F(28°C)
- Average high, July
- Coldest nights
- 10°F(-12°C)
- Average low, January
- Rain per year
- 34 in(863 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in Sun Prairie
Best for weatherThe most comfortable weather comes in September, with highs around 74°F (24°C) and about 3.4 in (87 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 27°F (-3°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)
Sun Prairie weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 27°F(-3°C) | 10°F(-12°C) | 1.2 in(30 mm) | 86% | 1.5 |
| FebFebruary | 31°F(0°C) | 13°F(-11°C) | 1.4 in(36 mm) | 74% | 2.5 |
| MarMarch | 44°F(7°C) | 24°F(-4°C) | 2.1 in(54 mm) | 75% | 3.6 |
| AprApril | 57°F(14°C) | 35°F(2°C) | 3.7 in(93 mm) | 66% | 4.5 |
| MayMay | 70°F(21°C) | 46°F(8°C) | 3.8 in(96 mm) | 67% | 5.2 |
| JunJune | 80°F(26°C) | 56°F(13°C) | 4.8 in(121 mm) | 69% | 5.8 |
| JulJuly | 83°F(28°C) | 60°F(16°C) | 3.4 in(87 mm) | 72% | 6.0 |
| AugAugust | 81°F(27°C) | 58°F(15°C) | 3.9 in(98 mm) | 73% | 5.2 |
| SepSeptemberBest | 74°F(24°C) | 50°F(10°C) | 3.4 in(87 mm) | 73% | 4.2 |
| OctOctober | 61°F(16°C) | 38°F(4°C) | 2.6 in(67 mm) | 74% | 2.6 |
| NovNovember | 45°F(7°C) | 28°F(-2°C) | 2.0 in(50 mm) | 83% | 1.6 |
| DecDecember | 32°F(0°C) | 17°F(-9°C) | 1.7 in(44 mm) | 89% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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