UV Index for Castro Valley, CA

Current Castro Valley UV Index

0 (Low)

Last Updated 4 minutes ago

Hourly Castro Valley UV Index

The hourly Castro Valley, CA UV Index forecast for Thursday, May 1st, 2025.

5 Day Hourly Castro Valley UV Index Forecast

Last Updated 12 hours ago

The UV index forecast for the next five days in Castro Valley, CA has no days reaching the extreme level and 4 days reaching the high or very high levels. The peak UV intensity in Castro Valley over the next five days will be 7.5 on Thursday, May 1st at 1:00 pm.

The UV index forecast for Thursday, May 1st in Castro Valley, CA is below.

Time UV Index Risk

The UV index forecast for Friday, May 2nd in Castro Valley, 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 0.2
Low
8am 0.7
Low
9am 2
Low
10am 3.9
Moderate
11am 5.7
Moderate
12pm 7
High
1pm 7
High
2pm 6.4
High
3pm 4.4
Moderate
4pm 2.7
Low
5pm 1.6
Low
6pm 0.9
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, May 3rd in Castro Valley, 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 1.2
Low
11am 2.5
Low
12pm 4
Moderate
1pm 6.2
High
2pm 6.3
High
3pm 5.3
Moderate
4pm 3.8
Moderate
5pm 2.2
Low
6pm 0.8
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, May 4th in Castro Valley, 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 0.2
Low
8am 0.7
Low
9am 1.7
Low
10am 3.1
Moderate
11am 5
Moderate
12pm 6.7
High
1pm 7.3
High
2pm 6.4
High
3pm 5.4
Moderate
4pm 3.8
Moderate
5pm 2.3
Low
6pm 1
Low
7pm 0.3
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, May 5th in Castro Valley, 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