UV Index for Keystone, SD

Current Keystone UV Index

0 (Low)

Last Updated 51 minutes ago

Hourly Keystone UV Index

The hourly Keystone, SD UV Index forecast for Wednesday, July 9th, 2025.

5 Day Hourly Keystone UV Index Forecast

Last Updated 16 hours ago

The UV index forecast for the next five days in Keystone, SD has no days reaching the extreme level and 2 days reaching the high or very high levels. The peak UV intensity in Keystone over the next five days will be 10.3 on Wednesday, July 9th at 1:00 pm.

The UV index forecast for Wednesday, July 9th in Keystone, SD is below.

Time UV Index Risk
5am 0
Low
6am 0.1
Low
7am 0.6
Low
8am 1.7
Low
9am 3.6
Moderate
10am 5.8
Moderate
11am 8.1
Very High
12pm 9.8
Very High
1pm 10.3
Very High
2pm 9.3
Very High
3pm 7.7
High
4pm 5.2
Moderate
5pm 3.2
Moderate
6pm 1.4
Low
7pm 0.5
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, July 10th in Keystone, SD 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 0.5
Low
8am 0.9
Low
9am 2.3
Low
10am 4.6
Moderate
11am 6.2
High
12pm 4.9
Moderate
1pm 7.8
High
2pm 4.8
Moderate
3pm 2.8
Low
4pm 3.2
Moderate
5pm 2.8
Low
6pm 1.3
Low
7pm 0.4
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, July 11th in Keystone, SD 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 0.5
Low
9am 0.4
Low
10am 0.8
Low
11am 0.9
Low
12pm 0.8
Low
1pm 1.2
Low
2pm 0.7
Low
3pm 5.5
Moderate
4pm 4.8
Moderate
5pm 2.8
Low
6pm 1.3
Low
7pm 0.4
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, July 12th in Keystone, SD 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