UV Index Today in St. Louis, Missouri (MO)

Friday, May 22, 2026 -1:40 PMCDT (GMT-5)

The UV Index in St. Louis, Missouri (MO) right now is 1.5. This reading was last updated at 1:00 PM CDT, about 40 minutes ago. The UV Index at2:00 PM CDT, in about 19 minutes from now, is expected to be 1.6.

The maximum UV Index today in St. Louis is expected to be 1.6 at 2:00 PM CDT,19 minutes from now. The maximum UV Index tomorrow is expected to be 7.4 at 1:00 PM CDT.

Data Source: National Oceanic and Atmospheric Administration (NOAA)

Today

May 22
1.6
2:00 PM CDT
Low

Tomorrow

May 23
7.4
1:00 PM CDT
High

UV Index Today Hourly

May 22

UV levels in St. Louis, Missouri (MO) are projected to top out at 1.6 today, hitting Low 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: 1:40 PM00.10.30.60.91.41.51.61.61.51.10.30.10
Data Source: National Oceanic and Atmospheric Administration (NOAA)

UV Index Tomorrow Hourly

May 23

The sun will be strongest in St. Louis, Missouri (MO) around 1:00 PM CDT tomorrow, with a UV Index of 7.4 (High risk).

02468106 AM7 AM8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM7 PM8 PMCentral Daylight Time (CDT, GMT-5)00.210.933.677.44.932.421.10.30
Data Source: National Oceanic and Atmospheric Administration (NOAA)

5 Day UV Index Forecast

May 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 AM0.3
Low
8:00 AM1
Low
9:00 AM2.5
Moderate
10:00 AM4.6
Moderate
11:00 AM6.6
High
12:00 PM7.4
High
1:00 PM5.5
High
2:00 PM2.9
Moderate
3:00 PM2.7
Moderate
4:00 PM1.5
Low
5:00 PM0.9
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

May 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 AM0.3
Low
10:00 AM0.6
Low
11:00 AM0.9
Low
12:00 PM1.4
Low
1:00 PM1.5
Low
2:00 PM1.6
Low
3:00 PM1.6
Low
4:00 PM1.5
Low
5:00 PM1.1
Low
6:00 PM0.3
Low
7:00 PM0.1
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

May 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 AM0.2
Low
8:00 AM1
Low
9:00 AM0.9
Low
10:00 AM3
Moderate
11:00 AM3.6
Moderate
12:00 PM7
High
1:00 PM7.4
High
2:00 PM4.9
Moderate
3:00 PM3
Moderate
4:00 PM2.4
Low
5:00 PM2
Low
6:00 PM1.1
Low
7:00 PM0.3
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

May 24, 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 AM0.2
Low
8:00 AM0.7
Low
9:00 AM1.2
Low
10:00 AM2.1
Low
11:00 AM3.2
Moderate
12:00 PM4.3
Moderate
1:00 PM4.4
Moderate
2:00 PM3.8
Moderate
3:00 PM4.1
Moderate
4:00 PM2.9
Moderate
5:00 PM2
Low
6:00 PM0.9
Low
7:00 PM0.3
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

May 25, 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 AM0.2
Low
8:00 AM0.8
Low
9:00 AM1.8
Low
10:00 AM3.5
Moderate
11:00 AM4.7
Moderate
12:00 PM4.9
Moderate
1:00 PM5.2
Moderate
2:00 PM5.3
Moderate
3:00 PM2.7
Moderate
4:00 PM1.9
Low
5:00 PM1.4
Low
6:00 PM1
Low
7:00 PM0.3
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)