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Coldest beach in Maine in September

158 coastal locations in Maine ranked by their typical September sea temperature. State-wide average in September: 15.5°C.

Coldest in September

Acadia

8.2°C

State September average

15.5°C

across 158 coastal locations in Maine

Vs annual mean

+5.5°C

above the year-round state average

What the Maine water feels like in September

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

Maine monthly average 4.0°C to 16.7°C
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  • Warmest month August 16.7°C
  • Coldest month March 4.0°C
  • Annual mean 9.9°C
  • Months above 20°C 0 of 12

Where September fits in the year

September sits inside the state pattern shown on the left. Browse a different month for a fresh ranking.

Maine sea temperature map (live)

Today's reading at every Maine beach we track. The list below uses the typical September mean from a decade of daily history.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 coldest Maine beaches in September

Sorted by typical September mean. Click any beach for the full location page.

# Location September mean
1 North Haven, Penobscot Bay, Maine Maine 14.8°C
2 Frenchboro Maine 14.6°C
3 Swans Island Maine 14.6°C
4 Deer Isle Maine 14.6°C
5 Stonington Maine 14.6°C
6 Sedgwick Maine 14.4°C
7 Surry Maine 14.4°C
8 Blue Hill Harbor, Blue Hill Bay, Maine Maine 14.3°C
9 Center Harbor, Eggemoggin Reach, Maine Maine 14.3°C
10 Isle Au Haut, Penobscot Bay, Maine Maine 14.3°C
11 Little Deer Isle, Eggemoggin Reach, Maine Maine 14.3°C
12 Oceanville, Deer Isle, Penobscot Bay Maine 14.3°C
13 Stonington, Deer Isle, Penobscot Bay, Maine Maine 14.3°C
14 Lamoine Maine 14.1°C
15 Tremont Maine 14.1°C
16 Trenton Maine 14.1°C
17 Bass Harbor, Mount Desert Island, Maine Maine 14.1°C
18 Mackerel Cove, Swans Island, Blue Hill Bay Maine 14.1°C
19 Southwest Harbor, Mount Desert Island, Maine Maine 14.1°C
20 Bar Harbor Maine 13.9°C
21 Ellsworth, Union River, Blue Hill Bay Maine 13.4°C
22 Prospect Harbor, Maine Maine 13.4°C
23 Prospect Harbour Maine 13.4°C
24 Winter Harbor, Frenchman Bay, Maine Maine 13.4°C
25 Franklin Maine 13.4°C
Show 25 more ▸
26 Hancock Maine 13.4°C
27 Sullivan Maine 13.4°C
28 Cutler Maine 13.4°C
29 Addison Maine 13.4°C
30 Beals Island Maine 13.4°C
31 Jonesport Maine 13.4°C
32 Green Island, Petit Manan Bar, Maine Maine 13.3°C
33 Eastport, Passamaquoddy Bay Maine 13.3°C
34 Milbridge Maine 13.3°C
35 Pettegrove Point, Dochet Island Maine 13.3°C
36 Steuben Maine 13.3°C
37 West Quoddy Head Maine 13.3°C
38 Machiasport Maine 13.3°C
39 Steele Harbor Island, Maine Maine 13.3°C
40 Eastport Maine 13.2°C
41 Birch Islands, Cobscook Bay, Maine Maine 12.8°C
42 Coffin Point, Coffin Neck Maine 12.8°C
43 Cutler, Little River, Maine Maine 12.8°C
44 Garnet Point, Hersey Neck, Pennamquan River, Cobscook Bay Maine 12.8°C
45 Gravelly Point, Whiting Bay Maine 12.8°C
46 Gulf of Maine Maine 12.8°C
47 Cutler Naval Base, Machias Bay Maine 12.7°C
48 Shoppee Point, Englishman Bay, Maine Maine 12.7°C
49 Stone Island, Machias Bay, Maine Maine 12.7°C
50 Acadia Maine 8.2°C

Warmest 10 in Maine in September

Same data flipped. The warmest spots in the state for this month.

# Location September mean
1 Kittery Maine 17.9°C
2 Ogunquit Maine 17.9°C
3 York Beach Maine 17.9°C
4 York Harbor Maine 17.9°C
5 Wells Maine 17.5°C
6 Biddeford Pool Maine 17.5°C
7 Biddeford Maine 17.5°C
8 Goose Rocks Beach Maine 17.5°C
9 Kennebunkport Maine 17.5°C
10 Atlantic Heights, Piscataqua River, New Hampshire Maine 17.5°C

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