UV Index for San Antonio, TX

Current San Antonio UV Index

0 (Low)

Last Updated 34 minutes ago

Hourly San Antonio UV Index

The hourly San Antonio, TX UV Index forecast for Thursday, September 18th, 2025.

5 Day Hourly San Antonio UV Index Forecast

Last Updated 7 hours ago

The UV index forecast for the next five days in San Antonio, TX has no days reaching the extreme level and 4 days reaching the high or very high levels. The peak UV intensity in San Antonio over the next five days will be 9.7 on Sunday, September 21st at 2:00 pm.

The UV index forecast for Thursday, September 18th in San Antonio, TX is below.

Time UV Index Risk
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, September 19th in San Antonio, TX 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 0.8
Low
10am 2.6
Low
11am 5.1
Moderate
12pm 7.6
High
1pm 9.3
Very High
2pm 9.5
Very High
3pm 8.1
Very High
4pm 5.6
Moderate
5pm 3
Moderate
6pm 1.1
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, September 20th in San Antonio, TX 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 0.8
Low
10am 2.5
Low
11am 5.1
Moderate
12pm 7.6
High
1pm 9.4
Very High
2pm 9.6
Very High
3pm 8.2
Very High
4pm 5.7
Moderate
5pm 2.7
Low
6pm 1
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, September 21st in San Antonio, TX 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 0.8
Low
10am 2.6
Low
11am 5.2
Moderate
12pm 7.8
High
1pm 9.6
Very High
2pm 9.7
Very High
3pm 7.8
High
4pm 3.2
Moderate
5pm 1.6
Low
6pm 1
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, September 22nd in San Antonio, TX 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