UV Index for Lewistown, MT

Current Lewistown UV Index

0 (Low)

Last Updated 24 minutes ago

Hourly Lewistown UV Index

The hourly Lewistown, MT UV Index forecast for Monday, September 15th, 2025.

5 Day Hourly Lewistown UV Index Forecast

Last Updated 11 hours ago

The UV index forecast for the next five days in Lewistown, MT has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Lewistown over the next five days will be 5.6 on Thursday, September 18th at 1:00 pm.

The UV index forecast for Monday, September 15th in Lewistown, MT is below.

Time UV Index Risk

The UV index forecast for Tuesday, September 16th in Lewistown, MT 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 0.7
Low
10am 1.8
Low
11am 3.1
Moderate
12pm 4.1
Moderate
1pm 4.9
Moderate
2pm 4.8
Moderate
3pm 4
Moderate
4pm 1.8
Low
5pm 0.7
Low
6pm 0.2
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, September 17th in Lewistown, MT 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 3.4
Moderate
12pm 4.7
Moderate
1pm 5.4
Moderate
2pm 5.2
Moderate
3pm 4.2
Moderate
4pm 2.8
Low
5pm 1.5
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 Thursday, September 18th in Lewistown, MT 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 3.5
Moderate
12pm 4.9
Moderate
1pm 5.6
Moderate
2pm 5.4
Moderate
3pm 4.4
Moderate
4pm 2.9
Low
5pm 1.5
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 Friday, September 19th in Lewistown, MT 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