UV index today: where the sun is strongest

Highest clear-sky UV in the next 36 hoursTop 20 of 191

The number is ultraviolet_index_clear_sky from MET Norway Locationforecast, the highest value in the next 36 hours at that city. It is the index MET gives for a clear sky. Cloud is not taken off it. The local time is the forecast step’s clock in the city’s time zone. Forecast files reported updated_at 2026-11-03T05:20:10Z, 2026-11-03T05:20:11Z, 2026-11-03T05:20:28Z, 2026-11-03T06:29:55Z, 2026-11-03T06:30:01Z, 2026-11-03T06:40:31Z, 2026-11-03T06:41:08Z, 2026-11-03T06:56:17Z, 2026-11-03T06:56:47Z.

Lowest peaks in the same window

These are the twelve lowest peaks in the same set, so a northern city in darkness is visible as a low number rather than dropped. A 0.0 means every clear-sky step in the window was 0.0.

What the WHO says the index is

The figures above are MET Norway’s clear-sky index. The sentences below are the World Health Organization’s, from its question-and-answer page “Radiation: The ultraviolet (UV) index”, 20 June 2022. They are quoted, not rewritten, and Voyaggora adds no medical advice of its own.

“The UVI is a measure of the level of UV radiation.”

“The values of the index range from zero upward - the higher the UVI, the greater the potential for damage to the skin and eye, and the less time it takes for harm to occur.”

WHO’s table on that page pairs a UV index of “0 to 2” with “You can safely enjoy being outside!”; “3 to 7” with “Seek shade during midday hours! Slip on a shirt, slop on sunscreen and slap on hat!”; and “8 and above” with “Avoid being outside during midday hours! Make sure you seek shade! Shirt, sunscreen and hat are a must!”

WHO also writes: “Even for very sensitive fair-skinned people, the risk of short-term and long-term UV damage below a UVI of 2 is limited, and under normal circumstances no protective measures are needed.”

WHO: Radiation: The ultraviolet (UV) index

How to read this

Rank is by the clear-sky number, highest first. Two cities with the same number are ordered by name. The local time can fall on today’s date or on the next date, depending on where the sun is in that city’s sky during the 36-hour window. Read the date in the local-time column before calling the number “this afternoon”.

Because the field is clear-sky, a cloudy day can have a lower UV at the ground than the number here. This page does not have an all-sky UV from MET Norway, so it does not invent one.

Coordinates sent to MET Norway are the guide-city coordinates rounded to four decimal places, which is what MET Norway asks for. Each city is requested once per run. MET Norway’s terms say not to ask again until the Expires time, and not to identify the site as Yr. The credit line names MET Norway.

A city name links to its Voyaggora guide when that guide folder exists. A country name links to the Travel Live country page when that folder exists.

• Forecast: MET Norway Locationforecast 2.0
• Terms: MET Weather API terms of service
• Licence: NLOD 2.0 and CC BY 4.0
• WHO: UV index question and answer