Weather in Nha Trang in August

Shoulder season. August sits in between. You will get good days and you will lose some. You should expect rain on 25 days of the month, which is more days wet than dry.

August ranks 12 of 12 — near the bottom of Nha Trang's year. February is the month that works, and the swing between the two is 42 points, which is a different holiday rather than a slightly better one.

Rain on 25 of the month's 31 days, 3 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 82% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 11 days top 30 °C — hot spells arrive, but they break; the day barely swings — 2.3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 32.2 °C and the coldest night fell to 26 °C, and the wettest single day dropped 88 mm — roughly 65% of the month's rain in one day.

August is moderately variable: 56 mm in the driest year against 296 mm in the wettest, around an average of 136 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 13.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 29.6 °C in July, 29.7 here, 29.4 in September. Nothing about the timing within the month matters much.

Daylight in August

Nha Trang sits close enough to the equator that daylight barely moves all year — 12.5 hours in August, against a range of just 1.4 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 28.8 °C in August — warm enough that the water offers no relief from the heat. The sea peaks at 29.3 °C in May and bottoms out at 25.3 °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 Nha Trang versus nearby

If Nha Trang 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, 7 days less rain. Vũng Tàu is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: August is a compromise. February is 42 points better and is what Nha Trang 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 Nha Trang

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