UV Index Today in Fontana, California (CA)

Sunday, September 20, 2026 -9:22 AM PDT (GMT-7)

The UV Index in Fontana, California (CA) right now is 1.6. This reading was last updated at 9:00 AM PDT, about 22 minutes ago. The UV Index at10:00 AM PDT, in about 37 minutes from now, is expected to be 3.3.

The maximum UV Index today in Fontana is expected to be 7.7 at 1:00 PM PDT,3 hours and 37 minutes from now. The maximum UV Index tomorrow is expected to be 7.7 at 1:00 PM PDT.

Data Source: National Oceanic and Atmospheric Administration (NOAA)

Today

September 20
7.7
1:00 PM PDT
Very High

Tomorrow

September 21
7.7
1:00 PM PDT
Very High

UV Index Today Hourly

September 20

The highest UV reading in Fontana, California (CA) today is 7.7 at 1:00 PM PDT, falling in the Very High category.

02468107 AM8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM7 PMPacific Daylight Time (PDT, GMT-7)Now: 9:22 AM00.51.63.35.277.77.35.43.11.20.30
Data Source: National Oceanic and Atmospheric Administration (NOAA)

UV Index Tomorrow Hourly

September 21

Weather models predict UV Index 7.7 for Fontana, California (CA) tomorrow, peaking near 1:00 PM PDT - Very High risk level.

02468107 AM8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM7 PMPacific Daylight Time (PDT, GMT-7)00.51.73.55.67.27.76.95.12.91.20.30
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 AM0.5
Low
9:00 AM1.8
Low
10:00 AM3.8
Moderate
11:00 AM6.1
High
12:00 PM7.7
Very High
1:00 PM8.2
Very High
2:00 PM7.3
High
3:00 PM5.4
Moderate
4:00 PM3.2
Moderate
5:00 PM1.3
Low
6:00 PM0.3
Low
7:00 PM0
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 AM0.5
Low
9:00 AM1.6
Low
10:00 AM3.3
Moderate
11:00 AM5.2
Moderate
12:00 PM7
High
1:00 PM7.7
Very High
2:00 PM7.3
High
3:00 PM5.4
Moderate
4:00 PM3.1
Moderate
5:00 PM1.2
Low
6:00 PM0.3
Low
7:00 PM0
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 AM0.5
Low
9:00 AM1.7
Low
10:00 AM3.5
Moderate
11:00 AM5.6
High
12:00 PM7.2
High
1:00 PM7.7
Very High
2:00 PM6.9
High
3:00 PM5.1
Moderate
4:00 PM2.9
Moderate
5:00 PM1.2
Low
6:00 PM0.3
Low
7:00 PM0
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 AM0.5
Low
9:00 AM1.6
Low
10:00 AM3.4
Moderate
11:00 AM5.5
High
12:00 PM7.1
High
1:00 PM7.5
Very High
2:00 PM6.7
High
3:00 PM4.8
Moderate
4:00 PM2.8
Moderate
5:00 PM1.1
Low
6:00 PM0.2
Low
7:00 PM0
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 AM0.5
Low
9:00 AM1.6
Low
10:00 AM3.4
Moderate
11:00 AM5.5
High
12:00 PM7
High
1:00 PM7.5
Very High
2:00 PM6.7
High
3:00 PM4.8
Moderate
4:00 PM2.8
Moderate
5:00 PM1.1
Low
6:00 PM0.2
Low
7:00 PM0
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
  • San Bernardino - 8.1
  • Riverside - 7.7
Data Source: National Oceanic and Atmospheric Administration (NOAA)