UV Index for Keystone, SD

Current Keystone UV Index

0 (Low)

Last Updated 1 minute ago

Hourly Keystone UV Index

The hourly Keystone, SD UV Index forecast for Saturday, December 27th, 2025.

5 Day Hourly Keystone UV Index Forecast

Last Updated 10 hours ago

The UV index forecast for the next five days in Keystone, SD has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Keystone over the next five days will be 1.3 on Tuesday, December 30th at 12:00 pm.

The UV index forecast for Saturday, December 27th in Keystone, SD is below.

Time UV Index Risk
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, December 28th 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
Low
7am 0
Low
8am 0
Low
9am 0.3
Low
10am 0.6
Low
11am 0.9
Low
12pm 1
Low
1pm 0.9
Low
2pm 0.6
Low
3pm 0.3
Low
4pm 0
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, December 29th 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
Low
7am 0
Low
8am 0
Low
9am 0.4
Low
10am 0.8
Low
11am 1.1
Low
12pm 1.2
Low
1pm 1
Low
2pm 0.6
Low
3pm 0.3
Low
4pm 0
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, December 30th 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
Low
7am 0
Low
8am 0
Low
9am 0.4
Low
10am 0.8
Low
11am 1.1
Low
12pm 1.3
Low
1pm 1.2
Low
2pm 0.8
Low
3pm 0.3
Low
4pm 0
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, December 31st 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