Weather in O'Fallon in August
O'Fallon, United States averages a high of 30.2°C (86.4°F) and low of 20.9°C (69.6°F) in August, with 9 rain days and 11.4 hours of daily sunshine. Travel score: 85.6/100 (Excellent). The best time to visit O'Fallon is September.
High
30°C86°F
Low
21°C70°F
🌧️
9
rain days
☀️
11.4
hrs/day sunshine
💧
70%
humidity
86— Excellent
August in O'Fallon is hot and occasionally wet — excellent conditions for exploring.
What are the average temperatures in O'Fallon?
How much does it rain in O'Fallon in August?
O'Fallon receives an average of 87.3mm of rainfall across 9 rainy days in August. The annual total is 1035.9mm.
What should I pack for O'Fallon in August?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light, breathable clothing
Hot weather with highs around 30°C
🧢
Sun hat or cap
Protection from intense sun
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
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