The highest day temperature in May 2025 was 90°F. The lowest night temperature was 71°F. The average values for day and night temperatures during May were 85.6°F и 80.4°F respectivly.

The average sea surface temperature in May 2025 for Cat Ba Island was 85.1°F. The maximum and minimum values were 82.2°F and 87.0°F respectively.

Most of the days in May are cloudy but you can also expect sunny or gloomy days.

Precipitation total in May for Cat Ba Island is 4.0 in.

The average wind speed in May is 9.2 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 Cat Ba Island in May is 7.4 hours.