UV Index for Sunnyvale, CA

Current Sunnyvale UV Index

1.3 (Low)

Last Updated 34 minutes ago

Hourly Sunnyvale UV Index

The hourly Sunnyvale, CA UV Index forecast for Thursday, December 18th, 2025.

5 Day Hourly Sunnyvale UV Index Forecast

Last Updated 35 minutes ago

The UV index forecast for the next five days in Sunnyvale, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Sunnyvale over the next five days will be 2.5 on Thursday, December 18th at 12:00 pm.

The UV index forecast for Thursday, December 18th in Sunnyvale, CA is below.

Time UV Index Risk
11am 2.1
Low
12pm 2.5
Low
1pm 2.3
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 Friday, December 19th in Sunnyvale, 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 0.1
Low
9am 0.4
Low
10am 1.1
Low
11am 2
Low
12pm 2.4
Low
1pm 2.3
Low
2pm 1.6
Low
3pm 0.8
Low
4pm 0.3
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 20th in Sunnyvale, 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 0.1
Low
9am 0.4
Low
10am 1
Low
11am 1.6
Low
12pm 1.6
Low
1pm 1.6
Low
2pm 1
Low
3pm 0.3
Low
4pm 0.1
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 21st in Sunnyvale, 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
Low
9am 0.1
Low
10am 0.3
Low
11am 0.5
Low
12pm 0.9
Low
1pm 0.4
Low
2pm 0.5
Low
3pm 0.2
Low
4pm 0
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 Monday, December 22nd in Sunnyvale, CA is below.

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