UV Index for Alta, WY

Current Alta UV Index

0 (Low)

Last Updated 34 minutes ago

Hourly Alta UV Index

The hourly Alta, WY UV Index forecast for Thursday, September 18th, 2025.

5 Day Hourly Alta UV Index Forecast

Last Updated 12 hours ago

The UV index forecast for the next five days in Alta, WY has no days reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Alta over the next five days will be 7 on Thursday, September 18th at 1:00 pm.

The UV index forecast for Thursday, September 18th in Alta, WY is below.

Time UV Index Risk
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0.2
Low
9am 0.9
Low
10am 2.2
Low
11am 4.1
Moderate
12pm 5.9
Moderate
1pm 7
High
2pm 6.8
High
3pm 5.7
Moderate
4pm 3.8
Moderate
5pm 2
Low
6pm 0.7
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, September 19th in Alta, WY 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 0.2
Low
9am 0.8
Low
10am 2.1
Low
11am 4
Moderate
12pm 5.7
Moderate
1pm 6.5
High
2pm 6.6
High
3pm 5.5
Moderate
4pm 3.4
Moderate
5pm 1.6
Low
6pm 0.5
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, September 20th in Alta, WY 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 0.2
Low
9am 0.8
Low
10am 2
Low
11am 3.7
Moderate
12pm 5.4
Moderate
1pm 6.4
High
2pm 6.3
High
3pm 5.2
Moderate
4pm 3.6
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 Sunday, September 21st in Alta, WY 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