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Weather in O'Fallon

O'Fallon, United States

37°C

Overcast

Conditions at 15:00 local time

Feels like
34°C
Humidity
24%
Wind
18.7 km/h SW
Recent precipitation
0 mm
Current time in O'FallonFind another city

Plan with local context

Use the forecast for O'Fallon

Carry this city directly into the next time or weather task.

Location context

About this forecast location

Forecast values apply to the listed city coordinates. Conditions can vary across large urban areas and complex terrain.

Coordinates
38.5923, -89.9112
Local time zone
America/Chicago
Administrative area
Illinois
Forecast service
WeatherAPI.com forecast service

Hourly forecast

Next 24 hours in O'Fallon

Hourly modeled conditions in America/Chicago local time.

  1. 37°COvercast9% precipitation17.6 km/h wind
  2. 37°COvercast9% precipitation16.9 km/h wind
  3. 36°CCloudy6% precipitation14.8 km/h wind
  4. 34°CPartly Cloudy4% precipitation13.7 km/h wind
  5. 32°COvercast9% precipitation14.4 km/h wind
  6. 31°COvercast10% precipitation15.5 km/h wind
  7. 30°COvercast10% precipitation15.8 km/h wind
  8. 29°COvercast11% precipitation14 km/h wind
  9. 29°COvercast11% precipitation18.4 km/h wind
  10. 28°CCloudy9% precipitation18.7 km/h wind
  11. 27°CClear3% precipitation18.7 km/h wind
  12. 27°CClear3% precipitation14.8 km/h wind
  13. 26°CPartly Cloudy5% precipitation13.7 km/h wind
  14. 25°CClear5% precipitation12.2 km/h wind
  15. 25°CClear4% precipitation12.2 km/h wind
  16. 25°CSunny5% precipitation11.9 km/h wind
  17. 26°CSunny4% precipitation12.6 km/h wind
  18. 29°CSunny2% precipitation17.3 km/h wind
  19. 32°CSunny1% precipitation18.4 km/h wind
  20. 34°CSunny1% precipitation19.4 km/h wind
  21. 36°CSunny0% precipitation18 km/h wind
  22. 37°CSunny0% precipitation16.6 km/h wind
  23. 38°CSunny0% precipitation16.6 km/h wind
  24. 39°CSunny0% precipitation16.9 km/h wind

Daily forecast

3-day forecast for O'Fallon

Daily high and low temperatures, precipitation chance and maximum wind speed.

  1. Overcast20°C to 37°C5% chance of precipitationWind up to 22.7 km/h
  2. Sunny25°C to 39°C1% chance of precipitationWind up to 19.4 km/h
  3. Sunny26°C to 39°C1% chance of precipitationWind up to 20.5 km/h

Retrieved 2026-08-31T20:17:14.739Z; refresh due by 2026-08-31T20:32:14.739Z.

Nearby forecasts

Weather near O'Fallon

Compare forecasts for nearby cities.

Where this forecast comes from

WeatherAPI.com supplies forecast values for the listed coordinates. Forecasts may combine modeled and observed information and should not replace official weather warnings.

Forecast retrieved 2026-08-31T20:17:14.739Z; refresh due by 2026-08-31T20:32:14.739Z.

View forecast details and sources
  • Weather and Geolocation API
    WeatherAPI.com · Forecast API v1; free plan · WeatherAPI.com terms; commercial and non-commercial use permitted by plan · Accessed
    Current weather conditions, the next 24 hours and a three-day forecast.
  • GeoNames cities15000
    GeoNames · 2026-07-15_01-57-51-849 · CC BY 4.0 · Accessed
    City identity, administrative area, coordinates and time-zone identifier.