Ballwin in September
8.1out of 10
Yes, a good time to go
Warm and comfortable: highs around 27°C. Some rain: about 8 rainy days.
27°CAvg high
15°CAvg low
8Rainy days (82 mm)
12:14 hDaylight
06:49Sunrise · 19:04 Sunset
Why this score
- Warm and comfortable: highs around 27°C
- Some rain: about 8 rainy days
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (2.8 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 | 5°C | -4°C | 70 mm | 8 | – | – | 5.0 |
| February | 8°C | -2°C | 63 mm | 8 | – | – | 5.6 |
| March | 14°C | 3°C | 96 mm | 11 | – | – | 6.3 |
| April | 20°C | 9°C | 116 mm | 11 | – | – | 7.1 |
| May | 25°C | 15°C | 124 mm | 13 | – | – | 7.1 |
| June | 29°C | 19°C | 103 mm | 11 | – | – | 7.3 |
| July | 31°C | 21°C | 86 mm | 11 | – | – | 7.0 |
| August | 31°C | 20°C | 75 mm | 9 | – | – | 7.4 |
| September | 27°C | 15°C | 82 mm | 8 | – | – | 8.1 |
| October | 21°C | 10°C | 87 mm | 8 | – | – | 7.8 |
| November | 13°C | 4°C | 92 mm | 8 | – | – | 6.5 |
| December | 7°C | -1°C | 66 mm | 8 | – | – | 5.3 |
Frequently asked questions
How hot is Ballwin in September?
Daytime highs average 27°C and nights about 15°C.
When is the best time to visit Ballwin?
The best months are September, October.