Napa, California, United States

Get the UV Index hourly forecast for today, tomorrow and the next 15 days for Napa, 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
4:50 pm

High6

UV INDEX

Hourly UV Index Forecast for Today
June 10, 2025

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

As of 4:50 pm today in Napa, California, United States, the UV Index is currently at a High level of 6.

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

Today

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

Tomorrow

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

Daily Napa UV Index Forecast for the next 15 days:

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
10
19 Jun
10
20 Jun
10
21 Jun
10
22 Jun
10
23 Jun
  • Low
    1-2
  • Moderate
    3-4-5
  • High
    6-7
  • Very High
    8-9-10
  • Xtreme
    11+

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