Ontario UV Index Today
- Current UV Index5.0
- Peak UV Index7.0
- Temperature22.5 ℃
- Peak UV at 1 PM
- Protection Recommended ☀️
Last updated:
The UV index in Ontario, California, United States 
will reach a high of 5 today. This means a normal level of sun exposure. See our tips below to stay safe!
Hourly Forecast Chart
Today's Safety Tips
Check the live data above for the current conditions and stay safe in the sun!
Ontario's UV Index
The UV index in Ontario, California, is generally high due to its sunny climate. It often ranges between 7 and 10 during the summer months, indicating strong ultraviolet radiation from the sun.
Weather Seasons
Ontario's weather is warm and dry in summer, with temperatures often reaching the 90s Fahrenheit. Winters are mild, with cooler nights and occasional rain, mostly happening in the winter and early spring.
Ontario's Climate
Compared to nearby Los Angeles, Ontario tends to be slightly hotter and drier. It is warmer and sunnier than coastal cities but cooler at night than desert areas like Palm Springs, which have more extreme temperatures.
Hourly UV Index Trend
See the UV index hour by hour for Ontario. When the level is high, it's smart to find some shade.
- TimeUVLevelTemp
- 12 PM5.0moderate22 ℃
Nearby Cities
Check the UV index in other cities near Ontario.