Weather in Saint Charles in August
Saint Charles, United States averages a high of 30°C (86°F) and low of 20.8°C (69.4°F) in August, with 9 rain days and 11.5 hours of daily sunshine. Travel score: 85.6/100 (Excellent). The best time to visit Saint Charles is September.
High
30°C86°F
Low
21°C69°F
🌧️
9
rain days
☀️
11.5
hrs/day sunshine
💧
70%
humidity
86— Excellent
August in Saint Charles is hot and occasionally wet — ideal for sightseeing and outdoor activities.
What are the average temperatures in Saint Charles?
How much does it rain in Saint Charles in August?
Saint Charles receives an average of 86.9mm of rainfall across 9 rainy days in August. The annual total is 1062.1mm.
What should I pack for Saint Charles in August?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 30°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Light rain jacket
Some rainy days expected (9 days)
☔
Umbrella
Be prepared for occasional showers
Traveling to United States in August?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31