Weather in Hoi An in October

Shoulder season. October sits in between. You will get good days and you will lose some. You should expect rain on 23 days of the month, which is more days wet than dry.

October ranks 9 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 23 of the month's 31 days, 12 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: 8 days top 30 °C — hot spells arrive, but they break; the day barely swings — 4.3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest October day reached 33.6 °C and the coldest night fell to 20.9 °C, and the wettest single day dropped 275 mm — roughly 49% of the month's rain in one day.

October is moderately variable: 258 mm in the driest year against 1892 mm in the wettest, around an average of 562 mm. Roughly two Octobers in three land near that average, and the third does something else entirely.

Wind is light at 8.2 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 29.2 °C.

How October sits in the year

The month is on the way down: 2 °C cooler than September, with November dropping another 1.6 °C. The first week and the last are not the same trip.

Daylight in October

Hoi An sits close enough to the equator that daylight barely moves all year — 11.8 hours in October, 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 28.1 °C in October — 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

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.

October 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 more rain. Ubon Ratchathani is close enough to be a coin toss — within a degree on temperature, 11 days less rain.

So: October is a compromise. February is 33 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 October.