St. Charles in August
7.5out of 10
Yes, a good time to go
Warm and comfortable: highs around 29°C. Frequent rain: about 10 rainy days.
29°CAvg high
22°CAvg low
10Rainy days (93 mm)
13:30 hDaylight
06:27Sunrise · 19:57 Sunset
Why this score
- Warm and comfortable: highs around 29°C
- Frequent rain: about 10 rainy days
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
- Sunscreen, sunglasses and a hat
How reliable is the forecast?
Rain in August varies a lot between years (±4.0 rainy days), so check the forecast closer to your trip. 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 | 7°C | 0°C | 77 mm | 9 | – | – | 5.2 |
| February | 9°C | 0°C | 71 mm | 8 | – | – | 5.7 |
| March | 13°C | 4°C | 98 mm | 10 | – | – | 6.2 |
| April | 19°C | 10°C | 84 mm | 10 | – | – | 7.3 |
| May | 24°C | 15°C | 86 mm | 10 | – | – | 7.7 |
| June | 28°C | 20°C | 90 mm | 11 | – | – | 7.5 |
| July | 31°C | 23°C | 96 mm | 13 | – | – | 6.9 |
| August | 29°C | 22°C | 93 mm | 10 | – | – | 7.5 |
| September | 26°C | 18°C | 102 mm | 9 | – | – | 7.7 |
| October | 20°C | 12°C | 87 mm | 8 | – | – | 7.7 |
| November | 14°C | 6°C | 74 mm | 8 | – | – | 6.8 |
| December | 9°C | 2°C | 85 mm | 9 | – | – | 5.7 |
Frequently asked questions
How hot is St. Charles in August?
Daytime highs average 29°C and nights about 22°C.
When is the best time to visit St. Charles?
The best months are May, September, October, June.