UV Index for Ontario, CA

Current Ontario UV Index

0 (Low)

Last Updated 48 minutes ago

Hourly Ontario UV Index

The hourly Ontario, CA UV Index forecast for Wednesday, December 10th, 2025.

5 Day Hourly Ontario UV Index Forecast

Last Updated 11 hours ago

The UV index forecast for the next five days in Ontario, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Ontario over the next five days will be 3 on Thursday, December 11th at 12:00 pm.

The UV index forecast for Wednesday, December 10th in Ontario, CA is below.

Time UV Index Risk
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, December 11th in Ontario, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.3
Low
9am 1
Low
10am 1.9
Low
11am 2.7
Low
12pm 3
Moderate
1pm 2.5
Low
2pm 1.7
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, December 12th in Ontario, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.3
Low
9am 1
Low
10am 1.8
Low
11am 2.6
Low
12pm 2.8
Low
1pm 2.4
Low
2pm 1.6
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, December 13th in Ontario, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.3
Low
9am 0.8
Low
10am 1.6
Low
11am 2.3
Low
12pm 2.5
Low
1pm 2.1
Low
2pm 1.4
Low
3pm 0.6
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, December 14th in Ontario, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low