UV index today  UV Index

Boulder UV Index Today

Day Summary

The UV index in Boulder, United States Flag of 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: 2025-08-01

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

UV index

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.

Disclaimer

* The information on this page about the UV index in Boulder is for educational purposes only. It is not a substitute for professional medical advice. Always consult a doctor for any health concerns.