St. Louis UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index7.9
- Avg Clouds72%
- Max Temp30.5 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in St. Louis, United States 
will reach a high of 7.9 today. This means a high level of sun exposure. See our tips below to stay safe!
Last checked: 2025-08-19
Hourly Forecast Chart
Today's Safety Tips
Be careful! The sun's rays are strong. Try to stay in the shade between 10 a.m. and 4 p.m. Wear a hat, sunglasses, and reapply SPF 30+ sunscreen every 2 hours.
St. Louis's UV Index
The UV index in St. Louis varies from low in winter to very high in summer, peaking around 8 to 10 during the hottest months. UV levels are moderate in spring and fall.
Weather Seasons
St. Louis experiences four distinct seasons with cold, sometimes snowy winters and hot, humid summers. Spring and fall are mild and pleasant, with occasional rain and thunderstorms, especially in spring.
St. Louis's Climate
Compared to the Midwest region, St. Louis generally has more humidity and warmer summers than cities further north. It has more extreme temperatures than nearby states like Missouri and Illinois but milder winter cold than places farther north.
Hourly UV Index Trend
See the UV index hour by hour for St. Louis. When the level is high, it's smart to find some shade.
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