September is a popular month to ask about Nui Bay because conditions can shift week to week along this coast. Expect the water near 29.0°C, with daily variation from wind, tides and recent storms. We refresh the live value from Open-Meteo Marine every hour, so the headline above always reflects the current state of the Andaman Sea.
Nui Bay sea temperature in September — averages 29.0°C
The sea at Nui Bay in Thailand averages 29.0°C during September, based on long-run climatology for the Andaman Sea. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · September
29.0°C
tropical · Excellent
Live water now
…
Recommended wetsuit
No wetsuit
At 29.0°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Monthly comparison
Yes — ideal swimming weather · Nui Bay
Can you swim at Nui Bay in July? — 29.0°C water29.0°CCan you swim at Nui Bay in August? — 29.0°C water29.0°CCan you swim at Nui Bay in September? — 29.0°C water29.0°CCan you swim at Nui Bay in October? — 29.0°C water29.0°CCan you swim at Nui Bay in November? — 28.0°C water28.0°CCan you swim at Nui Bay in December? — 27.0°C water27.0°C
Frequently asked questions
What is the average sea temperature at Nui Bay in September?
Nui Bay averages 29.0°C in September, based on long-run climatology for the Andaman Sea.
Is the sea warm enough to swim at Nui Bay in September?
Yes, most swimmers find 29.0°C comfortable for unrestricted swimming.
Do I need a wetsuit at Nui Bay in September?
No wetsuit needed.