Weather in Thanh Hóa in December

Prime time. If you get to pick your dates, December is the one. Highs average 21.9 °C, lows 13.9 °C, and rain falls on 5 days — nothing in the month is working against you.

December ranks 3 of 12 in Thanh Hóa. Only February scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain falls on only 5 days, so an itinerary with no wet-weather fallback is a reasonable risk. 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. Across the twenty years measured, the hottest December day reached 30.8 °C and the coldest night fell to 3.9 °C, and the wettest single day dropped 31 mm — roughly 103% of the month's rain in one day.

This is the volatile part. December rainfall has ranged from 6 mm to 134 mm across the twenty years measured — a 128 mm spread around an average of 30 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 8.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How December sits in the year

Temperatures hold steady either side: 25.6 °C in November, 21.9 here, 21.5 in January. Nothing about the timing within the month matters much.

Daylight in December

December sits at the dark end of Thanh Hóa's year — 10.9 hours of daylight against 13.3 at midsummer, holding steady all month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

Sea temperature

The sea sits at about 23.4 °C in December — comfortable for a proper swim. The sea peaks at 30 °C in August and bottoms out at 21 °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

Peak season. Expect the highest prices of the year and to be booking well ahead.

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

December in Thanh Hóa versus nearby

If Thanh Hóa is one option among several, the nearby comparison is worth making. Vinh is close enough to be a coin toss — within a degree on temperature, 4 days more rain. Hanoi is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: December is effectively as good as it gets here — 1 points behind February, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Thanh Hóa

See all twelve months in Thanh Hóa, or where else to go in December.