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Coldest beach in Connecticut in September

61 coastal locations in Connecticut ranked by their typical September sea temperature. State-wide average in September: 22.0°C.

Coldest in September

West Mystic, Mystic River, Long Island Sound

20.6°C

State September average

22.0°C

across 61 coastal locations in Connecticut

Vs annual mean

+8.8°C

above the year-round state average

What the Connecticut water feels like in September

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

Connecticut monthly average 3.1°C to 23.3°C
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  • Warmest month August 23.3°C
  • Coldest month February 3.1°C
  • Annual mean 13.2°C
  • Months above 20°C 3 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.

Connecticut sea temperature map (live)

Today's reading at every Connecticut 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 Connecticut beaches in September

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

# Location September mean
1 Cos Cob Harbor, Connecticut Connecticut 22.8°C
2 East Norwalk Connecticut 22.8°C
3 Long Neck Point, Long Island Sound Connecticut 22.8°C
4 Mianus Connecticut 22.8°C
5 Rowayton, Fivemile River, Connecticut Connecticut 22.8°C
6 Saugatuck, Saugatuck River, Long Island Sound Connecticut 22.8°C
7 South Norwalk, Connecticut Connecticut 22.8°C
8 South Norwalk, Norwalk River Connecticut 22.8°C
9 Black Rock Harbor, Cedar Creek Connecticut 22.7°C
10 Gulf Beach, Connecticut Connecticut 22.7°C
11 Long Hill, Housatonic River, Connecticut Connecticut 22.7°C
12 Milford Harbor, Connecticut Connecticut 22.7°C
13 Shelton, Housatonic River, Connecticut Connecticut 22.7°C
14 Sniffens Point, Housatonic River, Connecticut Connecticut 22.7°C
15 Stratford, I-95 bridge, Housatonic River, Connecticut Connecticut 22.7°C
16 Branford Connecticut 22.6°C
17 Bridgeport Connecticut 22.6°C
18 Milford Connecticut 22.6°C
19 New Haven Connecticut 22.6°C
20 West Haven Connecticut 22.6°C
21 Clinton Connecticut 22.1°C
22 Guilford Connecticut 22.1°C
23 Hammonasset Beach Connecticut 22.1°C
24 Madison Connecticut 22.1°C
25 Woodmont Connecticut 22.1°C
Show 25 more ▸
26 Great Captain Island Connecticut 22.0°C
27 Haddam, Connecticut River, Connecticut Connecticut 21.9°C
28 Old Lyme Connecticut 21.4°C
29 Old Saybrook Connecticut 21.4°C
30 Saybrook Manor Connecticut 21.4°C
31 Westbrook Connecticut 21.4°C
32 East Haddam Connecticut 21.3°C
33 Essex, Connecticut River, Connecticut Connecticut 21.3°C
34 Hadlyme, Connecticut River, Connecticut Connecticut 21.3°C
35 Lyme, highway bridge, Connecticut River, Connecticut Connecticut 21.3°C
36 Saybrook Jetty, Connecticut River, Connecticut Connecticut 21.3°C
37 Saybrook Point, Connecticut River, Connecticut Connecticut 21.3°C
38 Tylerville, Connecticut River, Connecticut Connecticut 21.3°C
39 Groton Connecticut 20.9°C
40 New London Connecticut 20.9°C
41 Niantic Connecticut 20.9°C
42 Ocean Beach Park Connecticut 20.9°C
43 Waterford Connecticut 20.9°C
44 New London, Thames River Connecticut 20.9°C
45 Norwich, Thames River, Connecticut Connecticut 20.9°C
46 Yale boathouse, Thames River, Connecticut Connecticut 20.9°C
47 Mystic Connecticut 20.6°C
48 Noank Connecticut 20.6°C
49 Stonington Connecticut 20.6°C
50 West Mystic, Mystic River, Long Island Sound Connecticut 20.6°C

Warmest 10 in Connecticut in September

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

# Location September mean
1 Byram Connecticut 22.9°C
2 Cos Cob Connecticut 22.9°C
3 Greenwich Connecticut 22.9°C
4 Old Greenwich Connecticut 22.9°C
5 Stamford Connecticut 22.9°C
6 Darien Connecticut 22.8°C
7 Fairfield Connecticut 22.8°C
8 Norwalk Connecticut 22.8°C
9 Westport Connecticut 22.8°C
10 Cos Cob Harbor, Connecticut Connecticut 22.8°C

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