UV Index for Herndon, VA

Current Herndon UV Index

0 (Low)

Last Updated 35 minutes ago

Hourly Herndon UV Index

The hourly Herndon, VA UV Index forecast for Wednesday, July 9th, 2025.

5 Day Hourly Herndon UV Index Forecast

Last Updated 16 hours ago

The UV index forecast for the next five days in Herndon, VA has no days reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Herndon over the next five days will be 10.5 on Thursday, July 10th at 1:00 pm.

The UV index forecast for Wednesday, July 9th in Herndon, VA is below.

Time UV Index Risk
7am 0.3
Low
8am 1.2
Low
9am 2.8
Low
10am 5
Moderate
11am 7.4
High
12pm 9.4
Very High
1pm 10.3
Very High
2pm 9.9
Very High
3pm 8.2
Very High
4pm 2.7
Low
5pm 1.5
Low
6pm 1.3
Low
7pm 0.1
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, July 10th in Herndon, VA 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 0.2
Low
8am 1.1
Low
9am 2.1
Low
10am 3.7
Moderate
11am 5
Moderate
12pm 7.9
High
1pm 10.5
Very High
2pm 9.7
Very High
3pm 8
Very High
4pm 5.7
Moderate
5pm 2.7
Low
6pm 0.3
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 Herndon, VA 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 0.3
Low
8am 1.2
Low
9am 2.8
Low
10am 5.1
Moderate
11am 7.5
High
12pm 9.4
Very High
1pm 10.3
Very High
2pm 7.8
High
3pm 3.4
Moderate
4pm 2
Low
5pm 1.8
Low
6pm 1.6
Low
7pm 0.5
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, July 12th in Herndon, VA 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 0.3
Low
8am 1.2
Low