Lagunitas-Forest Knolls, CA: Current UV Index and Hourly Forecast

On this page, you can find the current UV Index and hourly 5 day UV Index forecast for Lagunitas-Forest Knolls, Marin County, California (CA). The Ultraviolet Index forecast, which measures the radiation from the sun that reaches the Earth's surface is updated daily.

Current UV Index
4:43 PM PDT

5.4Risk: Moderate

(Updated 43 minutes ago.)

As of 4:43 PM PDT, the UV Index in Lagunitas-Forest Knolls, CA is 5.4 (Moderate).
The UV Index is expected to fall sharply to 3.2 (still Moderate) between 5:00 PM - 6:00 PM PDT today.

Hourly UV Index Forecast for Today
Saturday, June 28, 2025

6 AM9 AM12 PM3 PM6 PM9 PMPacific Daylight Time (PDT)0123456789101112Current Time: 4:43 PM, PDT

UV Index Data sourced from the NOAA.


As of 4:43 PM PDT today in Lagunitas-Forest Knolls, CA, the UV Index is currently at a moderate level of 5.4. As the day progresses, the UV index is expected to fall as the sun sets.

It will return to moderate levels at 5:00 PM and then drop to low levels again from 6:00 PM onwards. As the day transitions into the night, the UV Index will drop back down to 0 at 9:00 PM.


Summary of Hourly UV Index Forecast for Today and Tomorrow in Lagunitas-Forest Knolls, CA

Today

Time RangeUV IndexRisk
6:00 AM - 9:00 AM (PDT)0 - 1.1
Low
9:00 AM - 11:00 AM2.5 - 4.5
Moderate
11:00 AM - 12:00 PM6.6
High
12:00 PM - 4:00 PM7.5 - 9.5
Very High
4:00 PM - 6:00 PM3.2 - 5.4
Moderate
6:00 PM - 12:00 AM0 - 1.5
Low

Tomorrow

Time RangeUV IndexRisk
12:00 AM - 9:00 AM (PDT)0 - 1.1
Low
9:00 AM - 11:00 AM2.8 - 5.1
Moderate
11:00 AM - 4:00 PM7.6 - 9.9
Very High
4:00 PM - 5:00 PM5.7
High
5:00 PM - 6:00 PM3.3
Moderate
6:00 PM - 12:00 AM0 - 1.5
Low

Detailed Hourly Lagunitas-Forest Knolls UV Index Forecast for the next 5 days

Download CSV (Excel) ↓
TimeUV IndexRisk
4:00 PM - 5:00 PM (Now, PDT)5.4
Moderate
5:00 PM - 6:00 PM 3.2
Moderate
6:00 PM - 7:00 PM 1.5
Low
7:00 PM - 8:00 PM 0.5
Low
8:00 PM - 9:00 PM 0.1
Low
9:00 PM - 10:00 PM 0
Low
10:00 PM - 11:00 PM 0
Low
11:00 PM - 12:00 AM 0
Low

Current UV Index in Nearby Cities