St. Louis UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index5.1
- Avg Clouds4%
- Max Temp21.2 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in St. Louis, United States 
will reach a high of 5.1 today. This means a moderate level of sun exposure. See our tips below to stay safe!
Last checked: 2025-10-07
Hourly Forecast Chart
Today's Safety Tips
The sun is a bit strong. Find some shade during midday. Wear a hat, sunglasses, and use SPF 30+ sunscreen if you'll be outside for a while.
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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