Daylight hours in Hanoi today

Hanoi lies at 21°N. In Hanoi, day length ranges from 10h 51m in winter to 13h 25m in summer — a swing of about 2h 34m.

Solar noon — the moment the sun is highest — falls at 11:54 in Hanoi, 5 minutes before the clock says 12. The gap comes from the city's longitude within its timezone, the equation of time, and summer time where it applies. At midday the sun currently stands 73.7° above the horizon in Hanoi. Hanoi lies inside the tropics, so twice a year the midday sun passes straight overhead; at the opposite solstice it still reaches 45.5°.

Day length changes fastest near the spring and autumn equinoxes and slowest near the longest day and shortest day of the year. See the year chart to visualise how daylight hours shift month by month for Hanoi.

The longest day in Hanoi is around 13h 25m (around June 21). The shortest is around 10h 51m (around December 21). Days are currently getting shorter — losing about 1 minute per day.