Weather in O'Fallon, United States 🇺🇸
In O'Fallon right now it is 36°C and sunny, feeling like 34°C. The air is at 30% humidity and winds are about 18 km/h, and the UV index is 1 (low). Looking ahead, O'Fallon should sit between roughly 19°C and 39°C over the coming days.
Hourly Forecast for O'Fallon
14-Day Forecast for O'Fallon
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Additional Forecasts for O'Fallon
Air Quality
Historical Weather
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Best Time to Be Outside in O'Fallon Tomorrow
There is no good daylight window left in O'Fallon today. Tomorrow, the most comfortable window looks like 07:00 to 10:00, when it is around 25°C. It should stay dry through that window. No significant rain is expected in the next several hours.
Frequently Asked Questions about Weather in O'Fallon
What is the temperature in O'Fallon right now?
It is currently 36°C (96°F) in O'Fallon, sunny (feels like 34°C).
What's the weather like in O'Fallon right now?
Right now O'Fallon has Sunny, humidity 30%, wind 18 km/h SSE.
What is today's forecast for O'Fallon?
Today in O'Fallon: high 38°C, low 19°C, sunny. Chance of rain: 2%.
What is the 7-day weather forecast for O'Fallon?
Daily highs and lows for O'Fallon:
- 2026-08-30: 38°C / 19°C
- 2026-08-31: 39°C / 23°C
- 2026-09-01: 39°C / 25°C
- 2026-09-02: 39°C / 26°C
- 2026-09-03: 39°C / 26°C
- 2026-09-04: 39°C / 27°C
- 2026-09-05: 37°C / 26°C
Is it going to rain in O'Fallon today?
There is a 2% chance of rain in O'Fallon today.
What is the wind speed in O'Fallon right now?
Wind in O'Fallon is currently 18 km/h (11 mph) from the SSE.
What is the UV index in O'Fallon right now?
The UV index in O'Fallon is currently 0.7 (low). Sun protection is recommended when the index is 3 or higher.
