Weather in Hoi An in December

A good month. December is a solid month to be in Hoi An. You should expect rain on 20 days of the month, which is more days wet than dry.

December ranks 5 of 12 in Hoi An: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 20 of the month's 31 days, 7 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average December reaches 30 °C; the day barely swings — 4.1 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest December day reached 30 °C and the coldest night fell to 15.8 °C, and the wettest single day dropped 288 mm — roughly 116% of the month's rain in one day.

This is the volatile part. December rainfall has ranged from 48 mm to 849 mm across the twenty years measured — a 801 mm spread around an average of 249 mm. The average is real but almost no individual December looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 9.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 87% is the real story though — it is the number that decides how the day feels, not the 25.3 °C.

How December sits in the year

Temperatures hold steady either side: 27.6 °C in November, 25.3 here, 24.8 in January. Nothing about the timing within the month matters much. Rain is the thing that moves: January brings 7 days less of it, so pushing the dates later buys drier weather.

Daylight in December

Hoi An sits close enough to the equator that daylight barely moves all year — 11.2 hours in December, against a range of just 1.9 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 25.4 °C in December — warm enough to stay in as long as you like. The sea peaks at 29.9 °C in June and bottoms out at 24.1 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

December in Hoi An versus nearby

If Hoi An is one option among several, the nearby comparison is worth making. Qui Nhon is close enough to be a coin toss — within a degree on temperature, 3 days less rain. Ubon Ratchathani is a better bet in December — 6.2 °C warmer, 19 days less rain.

So: December is a compromise. February is 19 points better and is what Hoi An is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Hoi An

See all twelve months in Hoi An, or where else to go in December.