Jacksonville, FL UV Index Today
What is the UV index in Jacksonville right now?
0.6 Low
EPA describes low UV as needing no protection for most people.
Today's peak is 7.9 (Very High) at about 1pm local time.
When is UV strongest in Jacksonville today?
UV in Jacksonville peaks at 7.9 (Very High) around 1pm local time (GMT-4). It stays at 6 or above — the high band — for 3 hours, roughly 12pm to 3pm. UV is 3 or above for 6 hours.
Jacksonville today, in numbers
- Latitude
- 30.3°N — 112 of 121 from the north
- Today's peak
- 7.9 (Very High) — 35 of 121 nationally
- Peak arrives
- 1pm local (GMT-4)
- At or above 6
- 3 hours, 12pm to 3pm
- At or above 3
- 6 hours, 10am to 4pm
The window from 12pm to 3pm is the practical answer for Jacksonville today. Nationally today the spread runs 11.4 in Hilo (20°N) to 1.3 in Fargo (47°N). Why latitude and the clock decide this →
One sea breeze, arriving from one side
Downtown Jacksonville and the Atlantic beaches sit inside the same consolidated city, at opposite ends of it. The sea breeze reaches the oceanfront first and works inland from there, so the westside neighborhoods stay in the older, hotter air for hours after the beaches have cooled, and that lag is often where the cumulus goes up. One index number covers both ends.
Only one breeze is involved, and that is the real separation from the peninsula further south. The paired sea breezes that collide over central Florida on warm afternoons need Gulf water within reach of the same strip of land, and the nearest Gulf water to Jacksonville is more than a hundred miles off. Nothing collides here. The Atlantic front advances inland until it runs out of push, which leaves the lid on a Jacksonville afternoon looser and later than the one over Orlando.
Latitude cuts the other way. The city sits on the 30th parallel, near enough two degrees north of Orlando, and in June that barely registers: about 83 degrees of solar elevation at solstice noon against 85 down there. December is where those two degrees show, with the noon sun standing that much lower and the winter floor dropping with it. This is approximately Houston’s latitude, and near enough New Orleans’. It is not the Keys’.
Nearest metros we model
What does Jacksonville’s UV index mean today?
0.6 is Low. EPA describes low UV as needing no protection for most people. Today Jacksonville also reaches Very High at its peak — a different band from the one it is in right now, which is why the hour matters as much as the day.
Modelled, not measured
The UV figures for Jacksonville are computed by the Copernicus atmosphere model, not read off an instrument here — unlike the AQI on our air-quality pages, which comes from a regulatory monitor. Cloud is where a UV model is weakest. What that means in practice →
Questions about UV in Jacksonville
What is the UV index in Jacksonville today?
When is UV strongest in Jacksonville today?
Is this measured or modelled?
Related
Updated