UV Index Today in San Antonio, Texas (TX)

Sunday, September 20, 2026 -9:00 AM CDT (GMT-5)

The UV Index in San Antonio, Texas (TX) right now is 0.9. This reading was last updated at 9:00 AM CDT, about less than a minute ago. The UV Index at10:00 AM CDT, in about 59 minutes from now, is expected to be 2.5.

The maximum UV Index today in San Antonio is expected to be 9.6 at 2:00 PM CDT,4 hours and 59 minutes from now. The maximum UV Index tomorrow is expected to be 9.6 at 2:00 PM CDT.

Data Source: National Oceanic and Atmospheric Administration (NOAA)

Today

September 20
9.6
2:00 PM CDT
Very High

Tomorrow

September 21
9.6
2:00 PM CDT
Very High

UV Index Today Hourly

September 20

UV levels in San Antonio, Texas (TX) are projected to top out at 9.6 today, hitting Very High risk near 2:00 PM CDT.

02468107 AM8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM7 PM8 PMCentral Daylight Time (CDT, GMT-5)Now: 9:00 AM00.10.92.55.27.79.59.68.15.32.30.80.20
Data Source: National Oceanic and Atmospheric Administration (NOAA)

UV Index Tomorrow Hourly

September 21

Sun intensity in San Antonio, Texas (TX) is at its highest tomorrow at 2:00 PM CDT, registering UV Index 9.6 (Very High risk).

02468107 AM8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM7 PM8 PMCentral Daylight Time (CDT, GMT-5)00.10.92.65.27.89.59.68.25.631.10.20
Data Source: National Oceanic and Atmospheric Administration (NOAA)

5 Day UV Index Forecast

September 19, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0
Low
7:00 AM0
Low
8:00 AM0.1
Low
9:00 AM0.8
Low
10:00 AM2.5
Moderate
11:00 AM4.8
Moderate
12:00 PM7.2
High
1:00 PM8.8
Very High
2:00 PM8.9
Very High
3:00 PM7.6
Very High
4:00 PM5.3
Moderate
5:00 PM2.8
Moderate
6:00 PM1
Low
7:00 PM0.2
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

September 20, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0
Low
7:00 AM0
Low
8:00 AM0.1
Low
9:00 AM0.9
Low
10:00 AM2.5
Moderate
11:00 AM5.2
Moderate
12:00 PM7.7
Very High
1:00 PM9.5
Very High
2:00 PM9.6
Very High
3:00 PM8.1
Very High
4:00 PM5.3
Moderate
5:00 PM2.3
Low
6:00 PM0.8
Low
7:00 PM0.2
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

September 21, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0
Low
7:00 AM0
Low
8:00 AM0.1
Low
9:00 AM0.9
Low
10:00 AM2.6
Moderate
11:00 AM5.2
Moderate
12:00 PM7.8
Very High
1:00 PM9.5
Very High
2:00 PM9.6
Very High
3:00 PM8.2
Very High
4:00 PM5.6
High
5:00 PM3
Moderate
6:00 PM1.1
Low
7:00 PM0.2
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

September 22, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0
Low
7:00 AM0
Low
8:00 AM0.1
Low
9:00 AM0.9
Low
10:00 AM2.6
Moderate
11:00 AM5.2
Moderate
12:00 PM7.7
Very High
1:00 PM9.3
Very High
2:00 PM9.5
Very High
3:00 PM7.7
Very High
4:00 PM5.3
Moderate
5:00 PM2
Low
6:00 PM0.5
Low
7:00 PM0.1
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

September 23, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0
Low
7:00 AM0
Low
8:00 AM0
Low
9:00 AM0.8
Low
10:00 AM2.5
Moderate
11:00 AM4.9
Moderate
12:00 PM7.4
High
1:00 PM9.1
Very High
2:00 PM9
Very High
3:00 PM7.1
High
4:00 PM2.9
Moderate
5:00 PM1.2
Low
6:00 PM0.4
Low
7:00 PM0.1
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low
Data Source: National Oceanic and Atmospheric Administration (NOAA)

Nearby Places

Maximum UV Index Today
Data Source: National Oceanic and Atmospheric Administration (NOAA)