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O'Fallon weather
Current conditions and a 14-day forecast for O'Fallon, United States. Looking for typical seasonal weather instead? See the historical climate averages.
Now
29°C
Overcast · feels 34°C
Humidity
70%
relative humidity
Wind
7 km/h
10m wind speed
Chance of rain
32%
today
Next 24 hours in O'Fallon
| Time | Conditions | Temp | Rain chance |
|---|---|---|---|
| 10am | Overcast | 29°C | 3% |
| 11am | Partly cloudy | 30°C | 5% |
| 12pm | Partly cloudy | 28°C | 10% |
| 1pm | Overcast | 30°C | 15% |
| 2pm | Mainly clear | 32°C | 21% |
| 3pm | Overcast | 31°C | 19% |
| 4pm | Violent rain showers | 25°C | 25% |
| 5pm | Violent rain showers | 26°C | 27% |
| 6pm | Overcast | 27°C | 32% |
| 7pm | Overcast | 26°C | 22% |
| 8pm | Overcast | 26°C | 11% |
| 9pm | Overcast | 25°C | 5% |
| 10pm | Overcast | 25°C | 9% |
| 11pm | Overcast | 24°C | 9% |
| 12am | Overcast | 24°C | 8% |
| 1am | Overcast | 24°C | 6% |
| 2am | Mainly clear | 23°C | 7% |
| 3am | Mainly clear | 23°C | 4% |
| 4am | Clear sky | 23°C | 6% |
| 5am | Clear sky | 23°C | 6% |
| 6am | Overcast | 23°C | 5% |
| 7am | Overcast | 24°C | 5% |
| 8am | Overcast | 25°C | 8% |
| 9am | Overcast | 26°C | 9% |
14-day forecast for O'Fallon
| Day | Conditions | High / Low | Rain chance |
|---|---|---|---|
| Today | Violent rain showers | 32° / 24° | 32% |
| Fri, Jul 17 | Overcast | 34° / 23° | 15% |
| Sat, Jul 18 | Overcast | 34° / 23° | 19% |
| Sun, Jul 19 | Thunderstorm | 33° / 22° | 20% |
| Mon, Jul 20 | Moderate drizzle | 37° / 22° | 5% |
| Tue, Jul 21 | Overcast | 31° / 20° | 8% |
| Wed, Jul 22 | Overcast | 25° / 17° | 8% |
| Thu, Jul 23 | Overcast | 27° / 14° | 5% |
| Fri, Jul 24 | Overcast | 30° / 19° | 10% |
| Sat, Jul 25 | Overcast | 31° / 20° | 13% |
| Sun, Jul 26 | Overcast | 33° / 23° | 18% |
| Mon, Jul 27 | Dense drizzle | 36° / 24° | 28% |
| Tue, Jul 28 | Slight rain showers | 34° / 24° | 20% |
| Wed, Jul 29 | Light drizzle | 37° / 25° | 43% |
Want more sun and moon detail for O'Fallon? Use the sun calculator or moon calculator and search for O'Fallon. For a live look at any other city, try the interactive weather tool.
Frequently asked questions
What's the weather like in O'Fallon today?
Current conditions and today's forecast for O'Fallon, United States are shown above, refreshed regularly through the day.
How accurate is a 14-day forecast?
A forecast is most reliable for the next 3-5 days. Beyond that, temperature and precipitation chances further out are a general trend rather than an exact prediction.
What is O'Fallon's weather usually like?
For long-term averages — typical monthly temperatures and rainfall based on years of historical data — see O'Fallon's climate page rather than this live forecast.