What is the UV index in Chennai today?

See today's UV index for Chennai 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.

Daylight Hours › UV Index › Chennai

UV Index in Chennai Today

October 19, 2026 · Chennai, India

4,328,063 people

See today's UV index in Chennai 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 Chennai's coordinates and updated daily.

UV now · 07:00

1Low

UV rises later today

Peak today6at 11:00

Protect yourself08:35–14:21UV 3 or above

Time to burn~30 minfair skin, unprotected

Hour by hour

Clouds cut the peak by ~44%

Protection windowClear sky

Remember today

Sunscreen SPF 30+
Sunglasses
Hat
Shade at midday

Daylight: sunrise 06:00 – sunset 17:49

Tomorrow: UV 7 at its peak around 11:00

Calculate for Chennai Use my location

The UV index in Chennai peaks at 6 (high) around 11:00 today. Sun protection is recommended between 08:35 and 14:21, while the index stays at 3 or above. Cloud cover is damping the peak by roughly 44% compared with a clear sky. Tomorrow the index is forecast to peak at 7 around 11:00.

UV index in Chennai hour by hour

Time	UV index	Level
06:00	0.2	Low
07:00	1	Low
08:00	2	Low
09:00	3.7	Moderate
10:00	4.2	Moderate
11:00	5.8	Moderate
12:00	5.6	Moderate
13:00	5.2	Moderate
14:00	3.6	Moderate
15:00	1.9	Low
16:00	0.5	Low
17:00	0	Low
18:00	0	Low

UV index in Chennai

Chennai lies at 13°N. The midday sun reaches 67.1° above the horizon in Chennai today, and twice a year it passes straight overhead. Elevation is what sets the ceiling for UV, and over Chennai it is so steep that the rays take the shortest possible path through the atmosphere, and the index can reach extreme values.

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.

See also sunrise, sunset and daylight hours in Chennai.