Sun Prairie in September
7.9out of 10
Yes, a good time to go
Warm and comfortable: highs around 23°C. Frequent rain: about 9 rainy days.
23°CAvg high
12°CAvg low
9Rainy days (78 mm)
12:17 hDaylight
06:43Sunrise · 19:00 Sunset
Why this score
- Warm and comfortable: highs around 23°C
- Frequent rain: about 9 rainy days
What to wear and pack
- T-shirts and light layers
- A light jacket for cooler evenings
- Rain jacket or compact umbrella
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (2.9 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -3°C | -10°C | 40 mm | 8 | – | – | 4.0 |
| February | 0°C | -9°C | 40 mm | 6 | – | – | 4.2 |
| March | 7°C | -3°C | 60 mm | 9 | – | – | 5.1 |
| April | 14°C | 3°C | 99 mm | 12 | – | – | 6.2 |
| May | 21°C | 10°C | 101 mm | 12 | – | – | 7.2 |
| June | 26°C | 15°C | 109 mm | 12 | – | – | 7.3 |
| July | 28°C | 18°C | 87 mm | 10 | – | – | 7.7 |
| August | 26°C | 17°C | 94 mm | 10 | – | – | 7.6 |
| September | 23°C | 12°C | 78 mm | 9 | – | – | 7.9 |
| October | 15°C | 6°C | 74 mm | 9 | – | – | 6.9 |
| November | 7°C | -1°C | 54 mm | 8 | – | – | 5.4 |
| December | 0°C | -7°C | 47 mm | 7 | – | – | 4.1 |
Frequently asked questions
How hot is Sun Prairie in September?
Daytime highs average 23°C and nights about 12°C.
When is the best time to visit Sun Prairie?
The best months are September, July, August.