The highest day temperature in July 2025 was 81°F. The lowest night temperature was 51°F. The average values for day and night temperatures during July were 70.2°F и 61.0°F respectivly.

The average sea surface temperature in July 2025 for Mount Desert Island was 59.1°F. The maximum and minimum values were 55.4°F and 61.8°F respectively.

Most of the days in July are gloomy but you can also expect sunny days.

Precipitation total in July for Mount Desert Island is 1.1 in.

The average wind speed in July is 6.6 mph. It makes July one of the most windless months of the year for Mount Desert Island.

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 Mount Desert Island in July is 6.9 hours.