Weather in Nha Trang in May

Shoulder season. May is shoulder season in Nha Trang — cheaper, quieter, and a genuine gamble. You should expect rain on 20 days of the month, which is more days wet than dry.

May ranks 9 of 12 in Nha Trang: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 20 of the month's 31 days, 4 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. Pack for 30 °C days and 28 °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: 16 days top 30 °C — hot spells arrive, but they break; the day barely swings — 2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 32.8 °C and the coldest night fell to 26 °C, and the wettest single day dropped 48 mm — roughly 37% of the month's rain in one day.

May is moderately variable: 45 mm in the driest year against 236 mm in the wettest, around an average of 129 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 12.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 29.1 °C in April, 30 here, 29.8 in June. Nothing about the timing within the month matters much. Rain has already shifted: 12 days more than April had.

Daylight in May

Nha Trang sits close enough to the equator that daylight barely moves all year — 12.7 hours in May, 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 29.3 °C in May — 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.

May 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, 6 days less rain. Vũng Tàu is the weaker option in May — 2.7 °C warmer, 1 day more rain.

So: May 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 May.