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 102 mm (4 in), so keep a rain jacket handy.
Rainfall in O'Fallon in July
Records from the past 30 years suggest around 10 days of rain, with 102 mm (4 in) average for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in O'Fallon in July
Temperatures in O'Fallon in July top out at 31°C (88°F) and drop to 20°C (68°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. With lows of 20°C (68°F), the nights are warm and generally comfortable. With these average temperatures, expect occasional spikes in warmth. Wear light fabrics and stay cool by hydrating regularly.
Sunshine in O'Fallon in July
There are approximately 311 hours of sunshine this month, resulting in mostly clear days.Our weather planner can help you find worldwide destinations with pleasant weather during this period. October typically offers the best weather for O'Fallon.
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
102 mm (4 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 →
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What to Wear in O'Fallon in July
Warm but pleasant conditions in O'Fallon in July. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.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.
