Weather in Vinh in September

A hard month. September asks something of you. Go in knowing what. You should expect rain on 21 days of the month, which is more days wet than dry.

September ranks 8 of 12 in Vinh: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 21 of the month's 30 days, 8 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 84% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 19 days top 30 °C — hot spells arrive, but they break; the day barely swings — 5.6 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 37.1 °C and the coldest night fell to 20.8 °C, and the wettest single day dropped 214 mm — roughly 56% of the month's rain in one day.

September is moderately variable: 101 mm in the driest year against 923 mm in the wettest, around an average of 383 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 7.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 84%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way down: 1.7 °C cooler than August, with October dropping another 2.5 °C. The first week and the last are not the same trip.

Daylight in September

12.3 hours of daylight, losing 0.5 hours across the month. That is between Vinh's extremes of 13.2 and 11 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 29.4 °C in September — 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.

September in Vinh versus nearby

If Vinh is one option among several, the nearby comparison is worth making. Thanh Hóa is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Hanoi is close enough to be a coin toss — within a degree on temperature, 3 days less rain.

So: September is a compromise. February is 45 points better and is what Vinh 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 Vinh

See all twelve months in Vinh, or where else to go in September.