UV Index in Hanoi
Live UV index for Hanoi, Vietnam. Personalised SPF, reapply timing, and protection advice for your skin type. Free, no signup, updated every 30 minutes.
21.03°, 105.85° · UV data refreshes every 30 minutes
UV in Hanoi: what to expect
Subtropical 21°N; summer UV 10–11, mild winter low UV.
Peak season
May – August
Average peak UV
11 (extreme)
Country
Vietnam
Region
Asia
Sun safety for Hanoi
Hanoi sits in the extreme UV band during peak season. Fair skin can burn in under 15 minutes at noon. Plan outdoor time before 10am or after 4pm whenever possible. SPF 50 broad-spectrum is the floor, not the ceiling — apply 2 milligrams per square centimetre, which most people under-apply by a factor of three.
Reapply every 90 minutes during peak hours, immediately after swimming or heavy sweating. UPF 50 clothing covers more reliably than sunscreen on areas you can clothe — long sleeves, brimmed hat, UV-blocking sunglasses are not paranoia, they are the local norm in places like Hanoi.
Whatever Hanoi's climatology says, the live reading above is what counts on the day you check. UV varies hour by hour; the widget shows current and forecast values so you can plan around peak hours.
Why daily UV awareness matters in Hanoi
UV exposure is the leading preventable cause of skin cancer. Each blistering sunburn before age 20 doubles melanoma risk in adulthood. Cumulative UV from daily, unprotected exposure causes basal cell carcinoma, squamous cell carcinoma, premature aging, and pigmentation disorders.
For residents of Hanoi, the practical impact of knowing today's UV is choosing the right SPF strength, the right outdoor schedule, and the right protective clothing for the next few hours — not abstract long-term advice. The widget above turns this into a 5-second daily check.
Read the full UV checker guideOther cities in Asia
Tokyo, Japan
Average peak UV 11 · June – August
Seoul, South Korea
Average peak UV 9 · June – August
Beijing, China
Average peak UV 9 · June – August
Shanghai, China
Average peak UV 11 · May – September
Mumbai, India
Average peak UV 12 · March – May, October – November
Delhi, India
Average peak UV 12 · April – October
Related tools and guides
Sources & methodology
Live UV: Open-Meteo Air Quality API (CAMS atmospheric model + satellite + ground station inputs). City climatology values from NASA TEMIS UV climatology and CAMS reanalysis. SPF and reapply guidelines based on AAD, BAD, and WHO recommendations. Full editorial methodology →