O'Fallon UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index8.8
- Avg Clouds14%
- Max Temp29.2 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in O'Fallon, United States 
will reach a high of 8.8 today. This means a veryhigh level of sun exposure. See our tips below to stay safe!
Last checked: 2025-08-21
Hourly Forecast Chart
Today's Safety Tips
The risk is very high. It's best to stay out of the sun between 10 a.m. and 4 p.m. If you must be outside, wear protective clothing and apply sunscreen often.
O'Fallon's UV Index
O'Fallon, United States, has a UV index that varies throughout the year, generally reaching moderate to high levels during summer months and lower levels in winter, reflecting typical seasonal sun exposure patterns.
Weather Seasons
The city experiences four distinct seasons: warm, humid summers with temperatures often in the 80s and 90s (Fahrenheit), cool to cold winters with occasional snow, and mild spring and fall with changing foliage and moderate rainfall.
O'Fallon's Climate
Compared to the wider Midwest region and nearby states, O'Fallon has similar weather patterns but can be slightly warmer in summer and colder in winter than areas further south, while sharing humidity and precipitation trends common to this part of the U.S.
Hourly UV Index Trend
See the UV index hour by hour for O'Fallon. When the level is high, it's smart to find some shade.
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