O'Fallon Weather in July
July in O'Fallon brings very high temperatures, with highs of 31°C (88°F) and nights dropping to 20°C (68°F). Rainfall is on the higher side this month, averaging around 105 mm (4.1 in), so keep a rain jacket handy.
Rainfall in O'Fallon in July
You can expect rain on around 10 days based on historical patterns, with 105 mm (4.1 in) average for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in O'Fallon in July
Daytime temperatures in O'Fallon reach 31°C (88°F) in July, dropping to 20°C (68°F) at night. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. Nights cool down to 20°C (68°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions. Expect some days to be hotter than these averages. Stay cool by wearing light clothing and drinking plenty of water throughout the day.
Sunshine in O'Fallon in July
With approximately 311 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.For O'Fallon itself, October generally stands out with the best 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 July
Min Temperature
20°C (68°F)
Max Temperature
31°C (88°F)
Chance of Rain
33%
Precipitation
105 mm (4.1 in)
Rainy days
10 days
Humidity
68% *
Sunshine
311 hours *
Percentage Sunshine
68% *
Best Places in the United States of America in July
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 July →
perfect weather
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What to Wear in O'Fallon in July
Warm temperatures in July 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. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in O'Fallon in July
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.
