Weather in Hoi An in August

A hard month. August asks something of you. Go in knowing what. You should expect rain on 19 days of the month, which is more days wet than dry.

August ranks 12 of 12 — near the bottom of Hoi An's year. February is the month that works, and the swing between the two is 44 points, which is a different holiday rather than a slightly better one.

Rain on 19 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 32.6 °C days and 26.7 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 29 days top 30 °C, making the heat continuous rather than occasional; the day barely swings — 5.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 37.8 °C and the coldest night fell to 25 °C, and the wettest single day dropped 136 mm — roughly 81% of the month's rain in one day.

August is moderately variable: 46 mm in the driest year against 387 mm in the wettest, around an average of 167 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 5.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 79%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 33 °C in July, 32.6 here, 31.2 in September. Nothing about the timing within the month matters much. Rain has already shifted: 5 days more than July had.

Daylight in August

Hoi An sits close enough to the equator that daylight barely moves all year — 12.7 hours in August, 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 29.9 °C in August — warm enough that the water offers no relief from the heat. 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

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 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, 1 day less rain. Ubon Ratchathani is close enough to be a coin toss — 3.3 °C cooler, 7 days more rain.

So: August is a compromise. February is 44 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 August.