UV Index for Johnstown, CO

Current Johnstown UV Index

3.6 (Moderate)

Last Updated 30 minutes ago

Hourly Johnstown UV Index

The hourly Johnstown, CO UV Index forecast for Friday, August 29th, 2025.

5 Day Hourly Johnstown UV Index Forecast

Last Updated 22 hours ago

The UV index forecast for the next five days in Johnstown, CO has no days reaching the extreme level and 2 days reaching the high or very high levels. The peak UV intensity in Johnstown over the next five days will be 8.6 on Sunday, August 31st at 1:00 pm.

The UV index forecast for Friday, August 29th in Johnstown, CO is below.

Time UV Index Risk
11am 5.2
Moderate
12pm 4.5
Moderate
1pm 4
Moderate
2pm 1.9
Low
3pm 3.5
Moderate
4pm 2.4
Low
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, August 30th in Johnstown, CO 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 0.1
Low
8am 0.6
Low
9am 2
Low
10am 4
Moderate
11am 6.3
High
12pm 8
Very High
1pm 8.5
Very High
2pm 7.7
High
3pm 5.9
Moderate
4pm 2.7
Low
5pm 0.2
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, August 31st in Johnstown, CO 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 0.7
Low
9am 2
Low
10am 4
Moderate
11am 6.2
High
12pm 8
Very High
1pm 8.6
Very High
2pm 7.9
High
3pm 6.2
High
4pm 3.9
Moderate
5pm 2
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, September 1st in Johnstown, CO 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