UV Index for Johnston, SC

Current Johnston UV Index

0.2 (Low)

Last Updated 26 minutes ago

Hourly Johnston UV Index

The hourly Johnston, SC UV Index forecast for Tuesday, September 16th, 2025.

5 Day Hourly Johnston UV Index Forecast

Last Updated 18 hours ago

The UV index forecast for the next five days in Johnston, SC has no days reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Johnston over the next five days will be 7.8 on Wednesday, September 17th at 1:00 pm.

The UV index forecast for Tuesday, September 16th in Johnston, SC is below.

Time UV Index Risk
9am 0.8
Low
10am 2.3
Low
11am 4.2
Moderate
12pm 6.2
High
1pm 7.3
High
2pm 7.3
High
3pm 5.8
Moderate
4pm 4
Moderate
5pm 2.2
Low
6pm 0.8
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, September 17th in Johnston, SC 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 0.9
Low
10am 2.4
Low
11am 4.5
Moderate
12pm 6.5
High
1pm 7.8
High
2pm 7.8
High
3pm 6.5
High
4pm 4.3
Moderate
5pm 1.3
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 Thursday, September 18th in Johnston, SC 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 1.8
Low
11am 4.1
Moderate
12pm 6
High
1pm 7.1
High
2pm 6.4
High
3pm 5.1
Moderate
4pm 2.7
Low
5pm 1.6
Low
6pm 0.5
Low
7pm 0.1
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, September 19th in Johnston, SC 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