UV Index for St. Johns, AZ

Current St. Johns UV Index

4.2 (Moderate)

Last Updated 6 minutes ago

Hourly St. Johns UV Index

The hourly St. Johns, AZ UV Index forecast for Friday, July 18th, 2025.

5 Day Hourly St. Johns UV Index Forecast

Last Updated 5 hours ago

The UV index forecast for the next five days in St. Johns, AZ has 1 day reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in St. Johns over the next five days will be 11.4 on Saturday, July 19th at 12:00 pm.

The UV index forecast for Friday, July 18th in St. Johns, AZ is below.

Time UV Index Risk
5pm 2
Low
6pm 0.6
Low
7pm 0.1
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, July 19th in St. Johns, AZ 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 0.1
Low
7am 0.7
Low
8am 2.1
Low
9am 4.4
Moderate
10am 7.3
High
11am 9.8
Very High
12pm 11.4
Extreme
1pm 11.4
Extreme
2pm 9.8
Very High
3pm 7.2
High
4pm 4.4
Moderate
5pm 2.1
Low
6pm 0.7
Low
7pm 0.1
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, July 20th in St. Johns, AZ 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 0.1
Low
7am 0.6
Low
8am 1.9
Low
9am 4.4
Moderate
10am 7.2
High
11am 9.8
Very High
12pm 7.4
High
1pm 2.3
Low
2pm 1
Low
3pm 4.2
Moderate
4pm 4.2
Moderate
5pm 1.8
Low
6pm 0.6
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, July 21st in St. Johns, AZ 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 0.6
Low
8am 2
Low
9am 4.2
Moderate
10am 6.8
High
11am 9.4
Very High
12pm 9.4
Very High
1pm 2.9
Low
2pm 2.5
Low
3pm 4.6
Moderate
4pm 4.2
Moderate
5pm 0.9
Low
6pm 0.1
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, July 22nd in St. Johns, AZ is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low