Weather in Hoi An: September
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Average day temperature: | 87.5°F |
| Average night temperature: | 76.5°F | |
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Sea water temperature: | 85.4°F |
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Number of sunny days: | 10 days |
| Day length: | 12.0 - 12.4 hours | |
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Number of rainy days: | 10 days |
| Precipitation totals: | 7.2 in. | |
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forecast
| Hoi An |
temperature
| Hoi An |
Air temperature in September, °F
The highest day temperature during September of 2025 was 87°F. At the same time the lowest night temperature was 75°F. Daily and nightly averages during September were 84.0°F and 76.5°F.
Sea water temperature in Hoi An in September, °F
The average sea water temperature in September of 2025 was 85.0°F. The highest and lowest sea temperatures during the month were 86.4°F and 84.0°F.
Mostly all days in September are partly cloudy but sunny or cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in Hoi An in September is 5.6 in.
The average wind speed value in September is 6.0 mph It makes September lest windy month of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 5.7.
Best time for vacation in Hoi An
Hoi An on a weather map
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