What is the UV index in London today?

See today's UV index for London hour by hour above. The UV index is highest around solar noon and depends on the season, the weather and how high the sun rises above the horizon.

When is the UV index highest?

The UV index peaks around solar noon, typically between 12:00 and 15:00, when the sun is highest in the sky. About two-thirds of the day’s total UV falls between 10:00 and 16:00.

When should you use sunscreen?

The WHO recommends sun protection whenever the UV index is 3 or higher. Use sunscreen of at least SPF 30, seek shade around midday, and wear sunglasses and a hat when UV is high.

UV Index in London Today

September 28, 2026 · London, England

Capital7,556,900 people

See today's UV index in London hour by hour below. The UV index shows how strong the sun's ultraviolet radiation is — the higher the number, the faster skin can burn. Values are calculated for London's coordinates and updated daily.

UV now · 05:00

0Low

UV rises later today

Peak today3at 12:00

Protect yourself12:00–12:00UV 3 or above

Time to burn~55 minfair skin, unprotected

Hour by hour

Clear sky

Remember today

Sunscreen SPF 30+
Sunglasses

Daylight: sunrise 06:57 – sunset 18:48

Tomorrow: UV 2 at its peak around 13:00

Calculate for London Use my location

The UV index in London peaks at 3 (moderate) around 12:00 today. Sun protection is recommended between 12:00 and 12:00, while the index stays at 3 or above. Tomorrow the index is forecast to peak at 2 around 13:00.

UV index in London hour by hour

Time	UV index	Level
06:00	0	Low
07:00	0	Low
08:00	0.2	Low
09:00	0.8	Low
10:00	1.6	Low
11:00	2.4	Low
12:00	3	Moderate
13:00	2.9	Low
14:00	2.3	Low
15:00	1.6	Low
16:00	0.7	Low
17:00	0.3	Low
18:00	0.1	Low
19:00	0	Low

UV index in London

London lies at 52°N. The midday sun reaches 36.5° above the horizon in London today, against a yearly ceiling of 61.9°. Elevation is what sets the ceiling for UV, and over London it is high enough for the index to reach very high values through the summer months.

What is the UV index?

The UV index is an international scale describing the strength of the sun's ultraviolet radiation at ground level. It starts at 0 and is effectively open-ended — at mid-latitudes it rarely exceeds 8, while in the tropics and high in the mountains it can pass 11. The higher the number, the less time it takes to get sunburnt.

The UV index depends mainly on how high the sun is in the sky. That is why it peaks around solar noon and is greatest in summer near the longest day of the year. Clouds, ozone, altitude and reflection from snow or water also affect the value.

The WHO UV scale

UV index	Level	Recommendation
0–2	Low	No special protection needed.
3–5	Moderate	Use sunscreen (SPF 30+), seek shade around midday.
6–7	High	Sunscreen, hat and sunglasses. Avoid the sun 12:00–15:00.
8–10	Very high	Extra protection. Limit midday sun exposure.
11+	Extreme	Avoid the sun at midday. Full protection required.