Weather in Haiphong in August

A hard month. August is a hard month in Haiphong, and worth planning around. You should expect rain on 26 days of the month, which is more days wet than dry.

August ranks 10 of 12 — near the bottom of Haiphong's year. December is the month that works, and the swing between the two is 50 points, which is a different holiday rather than a slightly better one.

Rain on 26 of the month's 31 days, 10 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 86% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 22 days top 30 °C, making the heat continuous rather than occasional; the day barely swings — 4.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 35.1 °C and the coldest night fell to 22.7 °C, and the wettest single day dropped 129 mm — roughly 38% 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 538 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 338 mm average is a reasonable planning figure, not a promise.

Wind is light at 6.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 86% is the real story though — it is the number that decides how the day feels, not the 31 °C.

How August sits in the year

Temperatures hold steady either side: 31.2 °C in July, 31 here, 30.6 in September. Nothing about the timing within the month matters much. Rain is the thing that moves: September brings 7 days less of it, so pushing the dates later buys drier weather.

Daylight in August

August is at or near the longest days of Haiphong's year: 12.9 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 29.9 °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

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

August in Haiphong versus nearby

If Haiphong is one option among several, the nearby comparison is worth making. Hanoi is close enough to be a coin toss — within a degree on temperature, 2 days less rain. Thanh Hóa is close enough to be a coin toss — within a degree on temperature, 3 days less rain.

So: August is a compromise. December is 49 points better and is what Haiphong 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 Haiphong

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