The highest day temperature in June 2025 was 99°F. The lowest night temperature was 78°F. The average values for day and night temperatures during June were 90.6°F и 85.2°F respectivly.

The average sea surface temperature in June 2025 for Galveston Island was 88.6°F. The maximum and minimum values were 85.6°F and 91.6°F respectively.

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

Precipitation total in June for Galveston Island is 0.8 in. It makes june one of the least rainy months of the year.

The average wind speed in June is 10.2 mph.

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 Galveston Island in June is 8.7 hours.