Weather in Thanh Hóa in August

A hard month. August asks something of you. Go in knowing what. You should expect rain on 23 days of the month, which is more days wet than dry.

August ranks 9 of 12 in Thanh Hóa: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 23 of the month's 31 days, 9 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. Natural fibres and a second shirt for the day. At 85% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 26 days top 30 °C, making the heat continuous rather than occasional; the day barely swings — 5.7 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 36.1 °C and the coldest night fell to 23 °C, and the wettest single day dropped 106 mm — roughly 35% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 549 mm against 132 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 299 mm average is a reasonable planning figure, not a promise.

Wind is light at 5.9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 85% is the real story though — it is the number that decides how the day feels, not the 31.6 °C.

How August sits in the year

Temperatures hold steady either side: 32.6 °C in July, 31.6 here, 30.6 in September. Nothing about the timing within the month matters much.

Daylight in August

August is at or near the longest days of Thanh Hóa's year: 12.8 hours of daylight, losing 0.5 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 30 °C in August — warm enough that the water offers no relief from the heat. This is the warmest the water gets all year.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

August 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, the same number of rain days. Hanoi is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: August is a compromise. February is 52 points better and is what Thanh Hóa 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 Thanh Hóa

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