O'Fallon Weather in August
During August, O'Fallon experiences very high daytime temperatures of 31°C (88°F) and cooler nights around 20°C (68°F). Expect quite a bit of rainfall. Around 89 mm (3.5 in) is typical.
Rainfall in O'Fallon in August
Analyzing past climate data, one can expect approximately 9 days of rain, averaging 89 mm (3.5 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in O'Fallon in August
Daytime temperatures in O'Fallon reach 31°C (88°F) in August, dropping to 20°C (68°F) at night. For most visitors, the main thing to prepare for is the heat during the day. Nights drop to around 20°C (68°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in O'Fallon in August
The month enjoys around 268 hours of sunshine, creating mostly sunny days with good weather conditions.Should you favor a climate that's both dry and comfortably warm, October typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our O'Fallon's climate page.
O'Fallon Temperature in August
Min Temperature
20°C (68°F)
Max Temperature
31°C (88°F)
Chance of Rain
30%
Precipitation
89 mm (3.5 in)
Rainy days
9 days
Humidity
70% *
Sunshine
268 hours *
Percentage Sunshine
64% *
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
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What to Wear in O'Fallon in August
Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in O'Fallon in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our O'Fallon's climate page.
Temperature Rainfall Sunshine Humidity
See the full O'Fallon climate overview or explore weather in the United States of America.
