The highest day temperature in September 2023 was 97°F. The lowest night temperature was 76°F. The average values for day and night temperatures during September were 88.3°F и 80.5°F respectivly.

The average sea surface temperature in September 2023 for Ha Long was 89.9°F. The maximum and minimum values were 88.4°F and 91.6°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Ha Long is 7.5 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 8.4 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Ha Long in September is 7.4 hours.