Port St. John, FL: Current UV Index and Hourly Forecast

On this page, you can find the current UV Index and hourly 5 day UV Index forecast for Port St. John, Brevard County, Florida (FL). The Ultraviolet Index forecast, which measures the radiation from the sun that reaches the Earth's surface is updated daily.

Current UV Index
2:05 PM EDT

10Risk: Very High

(Updated 5 minutes ago.)

As of 2:05 PM EDT, the UV Index in Port St. John, FL is 10 (Very High).
The UV Index is expected to fall sharply to 8.4 (still Very High) between 3:00 PM - 4:00 PM EDT today.

Hourly UV Index Forecast for Today
Thursday, April 3, 2025

12 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PMEastern Daylight Time (EDT)0123456789101112Current Time: 2:05 PM, EDT

UV Index Data sourced from the NOAA.


As of 2:05 PM EDT today in Port St. John, FL, the UV Index is currently at its highest level for the day, 10, which is classified as very high risk. As the day progresses, the UV index is expected to fall as the sun sets.

It will return to high levels at 4:00 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 8:00 PM.


Summary of Hourly UV Index Forecast for Today and Tomorrow in Port St. John, FL

Today

Time RangeUV IndexRisk
12:00 AM - 10:00 AM (EDT)0 - 1.2
Low
10:00 AM - 11:00 AM3.1
Moderate
11:00 AM - 12:00 PM5.6
High
12:00 PM - 4:00 PM8.3 - 10
Very High
4:00 PM - 5:00 PM5.7
High
5:00 PM - 6:00 PM3
Moderate
6:00 PM - 12:00 AM0 - 1.1
Low

Tomorrow

Time RangeUV IndexRisk
12:00 AM - 10:00 AM (EDT)0 - 1.4
Low
10:00 AM - 11:00 AM3.5
Moderate
11:00 AM - 12:00 PM6.3
High
12:00 PM - 4:00 PM8.2 - 10.2
Very High
4:00 PM - 5:00 PM5.6
High
5:00 PM - 6:00 PM2.9
Moderate
6:00 PM - 12:00 AM0 - 1
Low

Detailed Hourly Port St. John UV Index Forecast for the next 5 days

Download CSV (Excel) ↓
TimeUV IndexRisk
2:00 PM - 3:00 PM (Now, EDT)10
Very High
3:00 PM - 4:00 PM 8.4
Very High
4:00 PM - 5:00 PM 5.7
High
5:00 PM - 6:00 PM 3
Moderate
6:00 PM - 7:00 PM 1.1
Low
7:00 PM - 8:00 PM 0.2
Low
8:00 PM - 9:00 PM 0
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

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