Castro Valley, California, United States

Get the UV Index hourly forecast for today, tomorrow and the next 15 days for Castro Valley, California, United States, The Ultraviolet Index forecast, which measures the radiation from the sun that reaches the Earth's surface is updated hourly.

Current UV Index
6:50 pm

Low1

UV INDEX

Hourly UV Index Forecast for Today
June 7, 2025

0
6 am
0
7 am
0
8 am
0
9 am
1
10 am
1
11 am
2
12 pm
3
1 pm
5
2 pm
8
3 pm
8
4 pm
7
5 pm
4
6 pm
1
7 pm
  • Low
    1-2
  • Moderate
    3-4-5
  • High
    6-7
  • Very High
    8-9-10
  • Xtreme
    11+

As of 6:50 pm today in Castro Valley, California, United States, the UV Index is currently at a Low level of 1.

Summary of Hourly UV Index Forecast for Today and Tomorrow in Castro Valley, California, United States.

Today

Time Range UV Index Risk
6 am 0
Low
7 am 0
Low
8 am 0
Low
9 am 0
Low
10 am 1
Low
11 am 1
Low
12 pm 2
Low
1 pm 3
Moderate
2 pm 5
Moderate
3 pm 8
Very High
4 pm 8
Very High
5 pm 7
High
6 pm 4
Moderate
7 pm 1
Low

Tomorrow

Time Range UV Index Risk
6 am 0
Low
7 am 0
Low
8 am 1
Low
9 am 2
Low
10 am 3
Moderate
11 am 5
Moderate
12 pm 7
High
1 pm 8
Very High
2 pm 8
Very High
3 pm 8
Very High
4 pm 6
High
5 pm 5
Moderate
6 pm 3
Moderate
7 pm 1
Low

Daily Castro Valley UV Index Forecast for the next 15 days:

8
7 Jun
8
8 Jun
9
9 Jun
10
10 Jun
10
11 Jun
10
12 Jun
10
13 Jun
10
14 Jun
10
15 Jun
10
16 Jun
10
17 Jun
10
18 Jun
9
19 Jun
10
20 Jun
  • Low
    1-2
  • Moderate
    3-4-5
  • High
    6-7
  • Very High
    8-9-10
  • Xtreme
    11+

UV Index in Nearby Cities