The highest day temperature in September 2025 was 98°F. The lowest night temperature was 78°F. The average values for day and night temperatures during September were 90.8°F и 80.8°F respectivly.

The average sea surface temperature in September 2025 for Hai Phong was 88.3°F. The maximum and minimum values were 86.8°F and 90.0°F respectively.

You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in September for Hai Phong is 6.6 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 6.7 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 Hai Phong in September is 7.0 hours.