UV index · US

UV index today: right now, hour by hour

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UV index in New York right now: 0 — the sun isn't up yet. Today it is forecast to peak at 1.9 (low) around 10 AM. Highest today among the cities below: Miami, 6.2 (high).

City	Max today	Level
New York	1.9 10 AM	low
San Diego	5.1 12 PM	moderate
Austin	5.2 1 PM	moderate
Seattle	2.2 1 PM	low
Los Angeles	4.9 12 PM	moderate
Chicago	1.2 12 PM	low
Las Vegas	4.7 12 PM	moderate
Miami	6.2 1 PM	high
Orlando	5.6 12 PM	high
Phoenix	5.1 1 PM	moderate
San Francisco	4.2 12 PM	moderate
Boston	3.2 11 AM	moderate
Denver	4.2 12 PM	moderate
Houston	5.4 1 PM	moderate
Dallas	4.9 1 PM	moderate
Tampa	5.6 12 PM	high
Philadelphia	2.2 12 PM	low
Washington, DC	1.9 1 PM	low
Atlanta	4 2 PM	moderate
Detroit	1.8 12 PM	low

Local time in each city. “Now” is the value for the current hour; “Max today” is the highest hourly value of the day and when it happens. Updated every hour.

What is the UV index where you are?

The table covers our cities. This block answers for any place: the UV index right now and today’s highest, with the hour.

UV index card in the app: today's hourly bars, peak 6.4, “Now moderate, protection needed”

In the Weather24 app

When does UV peak where you are?

The UV index card with today's peak, hour by hour, and a line that says whether you need protection right now.

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UV index in New York: today and tomorrow, hour by hour

Today the UV index in New York stays below 3 all day — on the WHO scale, no sun protection is needed. Each bar is one hour, in WHO colors. The thin line shows the UV index under a clear sky — clouds bring the real value below it.

UV clear sky protection from 3 night

UV index scale: what each level means

The UV index is the strength of the sun's ultraviolet radiation that burns skin. The World Health Organization's scale runs from 0 up, in five levels with fixed colors; from 3 the WHO recommends sun protection, from 8 extra protection.

0–2
Low
No protection needed — you can safely stay outside.
3–5
Moderate
Protection needed: seek shade around midday, cover up, wear a hat, sunglasses and sunscreen.
6–7
High
Protection needed: the same measures, and shade matters more between late morning and mid-afternoon.
8–10
Very high
Extra protection: avoid being outside around midday; shade, clothing, hat, sunglasses and sunscreen are a must.
11+
Extreme
Extra protection: avoid the midday sun; unprotected skin can burn within minutes.

UV index in New York by month: about 8 in June, 3 in November

In November the typical daily UV maximum in New York is about 3 — the last month of the season with 3 or more. After that it usually stays below 3 until January and peaks at about 8 in June.

Typical daily UV maximum for each month: the median of hourly model values over the last three years (Nov 2023 – Oct 2026, Open-Meteo). Sunny days run higher, overcast days lower.

UV index in the Weather24 app

On the Today screen the UV index card shows today's maximum and its level. Tap it for UV hour by hour with the peak and a line that says whether you need protection right now. UV is also in the rows under the hourly forecast — for your location and every saved city.

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Frequently asked questions

What is the UV index today?

UV index in New York right now: 0 — the sun isn't up yet. Today it is forecast to peak at 1.9 (low) around 10 AM. Today the UV index in New York stays below 3 all day — on the WHO scale, no sun protection is needed. The table at the top shows the UV index right now and today's maximum for 20 cities, updated every hour; each city also has its own page with an hourly chart.

What UV index is high?

On the WHO scale 0–2 is low, 3–5 moderate, 6–7 high, 8–10 very high and 11 or more extreme. From 3 the WHO recommends sun protection — shade around midday, clothing, a hat, sunglasses and sunscreen; from 8, extra protection and avoiding the midday sun.

What time is the UV index highest?

Around solar noon, when the sun is highest — usually between 11 AM and 3 PM; with daylight saving time the clock reads about an hour later. Today New York peaks around 10 AM.

Can you get UV when it's cloudy?

Yes. Thin or broken clouds let much of the ultraviolet through, and at the edges of scattered clouds the UV index can even be briefly higher. Only a thick, solid cloud layer cuts it substantially. That's why the chart above shows both the forecast and the clear-sky value.

Why is the UV index so low in winter?

Because the sun stays low: its rays cross more atmosphere at a slant and lose more of their ultraviolet. In November the typical daily UV maximum in New York is about 3 — the last month of the season with 3 or more. After that it usually stays below 3 until January and peaks at about 8 in June.

Where does the data come from?

From a weather model via Open-Meteo (CC BY 4.0), hour by hour. These are model values for a point in the city, not readings from a station. The official UV Index forecast in the US is published by the EPA with the National Weather Service.