Key West, Florida, United States UV Index Forecast

Find the UV Index forecast for today, tomorrow and the next 15 days for Key West, Florida, 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
12:42 pm

High7

UV INDEX

Hourly UV Index Forecast for Today
September 11, 2025

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

As of 12:42 pm today in Key West, Florida, United States, the UV Index is currently at a High level of 7.

Summary of Hourly UV Index Forecast for Today and Tomorrow in Key West, Florida, United States.

Today

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

Tomorrow

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

Daily Key West UV Index Forecast for the next 15 days:

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

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