In brief
In September in Nha Trang the sea is mostly calm: on 99% of days the highest wave of the day is 1 m or less. Rain of 5 mm or more falls on about 23% of days (6.1 mm a day on average), with about 6.8 hours of sun a day. Daytime 32.0°C, night 25.5°C, sea temperature about 29.8°C. Ranked by share of calm days, September is number 3 of 12.
This is reference statistics from past years, not a forecast or official data. For the coming days, see the “Nha Trang Now” page and the Vietnam national hydrometeorological service (nchmf.gov.vn).
Calm sea
daily wave ≤1 m; ranked 3 of 12 · 5 years
Waves (daily maximum)
0.4 m
average · 5 years
Rainy days
23 %
days with 5 mm or more of rain · average 6.1 mm/day · 25 years
Temperature
32° by day
night 26°C · sea 29.8°C · sun 6.8 h/day
Early, mid and late September
early September (1-10): calm sea 100% of days, rain of 5 mm+ 20%; mid September (11-20): calm sea 100% of days, rain of 5 mm+ 24%; late September (21-30): calm sea 98% of days, rain of 5 mm+ 26%.
This month compared with the others
My travel dates
Choose your arrival and departure - we show how many days of calm sea there usually are on those dates. If your dates are within the next 16 days, we add the real forecast.
Frequently asked questions
What is the sea like in Nha Trang in September?
According to the Open-Meteo Marine model (5 years), in September the highest wave of the day is 1 m or less on 99% of days; the average daily maximum wave height is 0.43 m. Summary of the statistics: the sea is mostly calm. Ranked by share of calm days, September is number 3 of 12. These are statistics from past years, not a forecast.
Does it rain in Nha Trang in September?
According to the Nha Trang weather station (25 years), rain of 5 mm or more falls on about 23% of days in September, with 6.1 mm of rain a day on average. These are statistics from past years, not a forecast.
How warm is the sea in Nha Trang in September?
Sea surface temperature from the Open-Meteo Marine model (5 years) averages about 29.8°C.
How hot is Nha Trang in September?
According to the Nha Trang weather station (25 years), daytime highs average 32.0°C and nights 25.5°C, with about 6.8 hours of sun a day.
What is the weather like in late September in Nha Trang?
By part of the month: early September (1-10): calm sea 100% of days, rain of 5 mm+ 20%; mid September (11-20): calm sea 100% of days, rain of 5 mm+ 24%; late September (21-30): calm sea 98% of days, rain of 5 mm+ 26%. Statistics for 5 years (sea) and 25 years (rain), not a forecast.
Is September a good time to go to Nha Trang?
It depends on what you plan. For the beach: calm sea on 99% of days (number 3 of 12 months for calm seas, 1 = calmest). Rain of 5 mm+ on 23% of days (number 4 of 12 for rainy days, 1 = rainiest), water 29.8°C. These are statistics from past years, not a forecast.
Rain and air temperature: Nha Trang weather station (WMO 48877, NOAA GHCN-Daily), 2000-2025, 26 years. Waves and sea temperature: Open-Meteo Marine model, data since 10.2021, 5 years. Sunshine hours: Vietnam standard QCVN 02:2022/BXD. A ±7-day window around each date, all years pooled.