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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
30°C
Clear sky · feels 36°C
Humidity
66%
relative humidity
Wind
8 km/h
10m wind speed
Chance of rain
6%
today
Next 24 hours in O'Fallon
| Time | Conditions | Temp | Rain chance |
|---|---|---|---|
| 11am | Clear sky | 30°C | 0% |
| 12pm | Clear sky | 31°C | 0% |
| 1pm | Clear sky | 32°C | 1% |
| 2pm | Clear sky | 33°C | 1% |
| 3pm | Clear sky | 33°C | 0% |
| 4pm | Clear sky | 34°C | 2% |
| 5pm | Clear sky | 34°C | 1% |
| 6pm | Clear sky | 33°C | 1% |
| 7pm | Clear sky | 32°C | 6% |
| 8pm | Clear sky | 30°C | 2% |
| 9pm | Clear sky | 28°C | 4% |
| 10pm | Clear sky | 27°C | 3% |
| 11pm | Clear sky | 26°C | 2% |
| 12am | Clear sky | 26°C | 2% |
| 1am | Clear sky | 25°C | 2% |
| 2am | Clear sky | 24°C | 3% |
| 3am | Clear sky | 24°C | 4% |
| 4am | Clear sky | 23°C | 6% |
| 5am | Clear sky | 23°C | 8% |
| 6am | Clear sky | 23°C | 8% |
| 7am | Clear sky | 24°C | 8% |
| 8am | Clear sky | 27°C | 7% |
| 9am | Clear sky | 30°C | 6% |
| 10am | Clear sky | 31°C | 10% |
14-day forecast for O'Fallon
| Day | Conditions | High / Low | Rain chance |
|---|---|---|---|
| Today | Clear sky | 34° / 21° | 6% |
| Thu, Jul 16 | Light drizzle | 33° / 23° | 31% |
| Fri, Jul 17 | Thunderstorm | 32° / 23° | 35% |
| Sat, Jul 18 | Partly cloudy | 34° / 23° | 12% |
| Sun, Jul 19 | Light drizzle | 35° / 23° | 4% |
| Mon, Jul 20 | Moderate drizzle | 34° / 23° | 4% |
| Tue, Jul 21 | Slight rain showers | 31° / 20° | 7% |
| Wed, Jul 22 | Overcast | 30° / 19° | 4% |
| Thu, Jul 23 | Overcast | 37° / 21° | 6% |
| Fri, Jul 24 | Light drizzle | 34° / 22° | 9% |
| Sat, Jul 25 | Overcast | 23° / 16° | 17% |
| Sun, Jul 26 | Moderate drizzle | 16° / 13° | 19% |
| Mon, Jul 27 | Moderate rain showers | 16° / 13° | 23% |
| Tue, Jul 28 | Light drizzle | 19° / 16° | 27% |
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.