Boulder UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index9.1
- Avg Clouds47%
- Max Temp31.9 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in Boulder, United States 
will reach a high of 9.1 today. This means a veryhigh level of sun exposure. See our tips below to stay safe!
Last checked: 2025-08-22
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.
Boulder's UV Index
Boulder's UV index can be quite high, especially in summer, often reaching levels of 7 to 9, which means strong sun exposure. In winter, the UV index drops significantly, sometimes below 2.
Weather Seasons
Boulder experiences four distinct seasons. Summers are warm and sunny, while winters are cold with occasional snow. Springs and autumns are mild, with moderate temperatures and changing leaves in fall.
Boulder's Climate
Compared to nearby Denver, Boulder is slightly cooler due to its higher elevation. The region has more sunshine than many other parts of Colorado. Neighboring states like Wyoming and Nebraska generally have lower UV indexes and cooler temperatures.
Hourly UV Index Trend
See the UV index hour by hour for Boulder. When the level is high, it's smart to find some shade.
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