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Southwest Harbor, Mount Desert Island, Maine Sea Temperature in July

Maine, United States

June Southwest Harbor, Mount Desert Island, Maine year-round → August

Average sea temperature for Southwest Harbor, Mount Desert Island, Maine, United States across July, based on 10 years of daily readings.

Average

13.37° C

High

16.25° C

Low

10.12° C

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

July is the 3rd warmest of 12 months at Southwest Harbor, Mount Desert Island, Maine. On average the water sits 4.2° than the year-round mean of 9.18° C.

Compared to June, July is 2.6° warmer than (10.82° C in June). By August the water is usually 14.68° C.

Southwest Harbor, Mount Desert Island, Maine Day-by-Day Water Temperature in July

10-year low, average and high

9.0° C
11.1° C
13.3° C
15.4° C
17.5° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through July. Range Average

Each vertical bar above is one day of July. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Southwest Harbor, Mount Desert Island, Maine.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

July Water Temperature Table for Southwest Harbor, Mount Desert Island, Maine

10-year daily averages

Day Average Low High
July 1 12.05° C 10.9° C 13.68° C
July 2 12.05° C 11.29° C 12.84° C
July 3 12.04° C 11.45° C 12.73° C
July 4 12.07° C 10.63° C 13.22° C
July 5 12.11° C 10.12° C 13.38° C
July 6 12.36° C 10.72° C 13.44° C
July 7 12.69° C 11.63° C 13.5° C
July 8 12.72° C 11.7° C 13.43° C
July 9 12.82° C 12.32° C 13.47° C
July 10 12.93° C 12.04° C 14.2° C
July 11 13.12° C 11.95° C 14.28° C
July 12 13.18° C 11.65° C 14.11° C
July 13 13.26° C 12.04° C 14.46° C
July 14 13.33° C 11.95° C 14.54° C
July 15 13.53° C 12.25° C 15.45° C
July 16 13.63° C 12.85° C 14.69° C
July 17 13.46° C 12.58° C 14.31° C
July 18 13.56° C 12.46° C 14.99° C
July 19 13.5° C 12.35° C 14.68° C
July 20 13.58° C 12.1° C 14.71° C
July 21 13.85° C 12.21° C 14.71° C
July 22 14.02° C 12.45° C 14.78° C
July 23 13.98° C 12.79° C 15.15° C
July 24 14.04° C 12.73° C 15.35° C
July 25 14.12° C 12.87° C 15.31° C
July 26 14.02° C 12.98° C 15.65° C
July 27 13.89° C 12.87° C 15.55° C
July 28 14.27° C 13.22° C 16.11° C
July 29 14.42° C 13.04° C 16.25° C
July 30 14.25° C 13.19° C 15.47° C
July 31 14.28° C 13.15° C 15.39° C

Where July Sits in the Year

July highlighted

-0.5° C
4.6° C
9.8° C
14.9° C
20.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
5.61° C
4.18° C
3.87° C
5.11° C
7.57° C
10.82° C
13.37° C
14.68° C
14.05° C
12.58° C
10.48° C
7.83° C
10-year monthly history for Southwest Harbor, Mount Desert Island, Maine. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in July

Compare other United States water for the same month

Southwest Harbor, Mount Desert Island, Maine Location

44.2750, -68.3133

44.27500, -68.31330 View on OpenStreetMap →

Southwest Harbor, Mount Desert Island, Maine sits at 44.2750°N, 68.3133°W, on the coast of Maine, United States. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Southwest Harbor, Mount Desert Island, Maine