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Riverside, CA UV Index Today

Modelled for · GMT-7

Right now

9.8 Very High

EPA suggests avoiding the sun between 10am and 4pm where you can.

Today's peak is 10.1 (Very High) at about 1pm local time.

Hour by hour today

Local time, midnight to midnight. Bar colour is the EPA UV band, never restyled.

Riverside today, in numbers

Latitude
34.0°N — 94 of 121 from the north
Today's peak
10.1 (Very High) — 6 of 121 nationally
Peak arrives
1pm local (GMT-7)
At or above 6
5 hours, 11am to 4pm
At or above 3
8 hours, 9am to 5pm

The window from 11am to 4pm is the practical answer for Riverside today. Nationally today the spread runs 10.9 in Tucson (32°N) to 1.5 in Anchorage (61°N). Why latitude and the clock decide this →

Nearest metros we model

UV changes with latitude, not with a city boundary, so a neighbour a hundred miles north reads differently for a reason.

Anaheim, CA 30 mi · 33.8°N peak 9.9 Irvine, CA 31 mi · 33.7°N peak 9.6 Long Beach, CA 47 mi · 33.8°N peak 9.6

Where Riverside sits on the scale

9.8 is Very High. EPA suggests avoiding the sun between 10am and 4pm where you can. Today Riverside also reaches Very High at its peak .

The scale is open-ended: 11 is where the named bands stop, not the maximum. All five bands, with the EPA guidance for each →

Modelled, not measured

The UV figures for Riverside 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 Riverside

What is the UV index in Riverside today?

9.8 right now (Very High), peaking at 10.1 around 1pm local time. UV stays at 6 or above for 5 hours, from about 11am to 4pm. This is a modelled value, not a ground measurement.

When is UV strongest in Riverside today?

Around 1pm local time (GMT-7), not at noon — solar noon drifts across a timezone and daylight saving moves it later on the clock.

Is this measured or modelled?

Modelled. The figures come from the Copernicus atmosphere model via Open-Meteo, unlike the AQI on our air-quality pages, which is read from an EPA regulatory monitor. Cloud cover is where a UV model is weakest.

Riverside air qualityThe AQI, from a regulatory monitor rather than a model UV across the USWhere Riverside sits against every metro we track

Updated