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Warmest 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.

Warmest in September

Byram

22.9°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 warmest Connecticut beaches in September

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

# 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
11 East Norwalk Connecticut 22.8°C
12 Long Neck Point, Long Island Sound Connecticut 22.8°C
13 Mianus Connecticut 22.8°C
14 Rowayton, Fivemile River, Connecticut Connecticut 22.8°C
15 Saugatuck, Saugatuck River, Long Island Sound Connecticut 22.8°C
16 South Norwalk, Connecticut Connecticut 22.8°C
17 South Norwalk, Norwalk River Connecticut 22.8°C
18 Southport, Southport Harbor Connecticut 22.8°C
19 Stamford Harbor, Stamford Connecticut 22.8°C
20 Black Rock Harbor, Cedar Creek Connecticut 22.7°C
21 Gulf Beach, Connecticut Connecticut 22.7°C
22 Long Hill, Housatonic River, Connecticut Connecticut 22.7°C
23 Milford Harbor, Connecticut Connecticut 22.7°C
24 Shelton, Housatonic River, Connecticut Connecticut 22.7°C
25 Sniffens Point, Housatonic River, Connecticut Connecticut 22.7°C
Show 25 more ▸
26 Stratford, I-95 bridge, Housatonic River, Connecticut Connecticut 22.7°C
27 Branford Connecticut 22.6°C
28 Bridgeport Connecticut 22.6°C
29 Milford Connecticut 22.6°C
30 New Haven Connecticut 22.6°C
31 West Haven Connecticut 22.6°C
32 Clinton Connecticut 22.1°C
33 Guilford Connecticut 22.1°C
34 Hammonasset Beach Connecticut 22.1°C
35 Madison Connecticut 22.1°C
36 Woodmont Connecticut 22.1°C
37 Great Captain Island Connecticut 22.0°C
38 Haddam, Connecticut River, Connecticut Connecticut 21.9°C
39 Old Lyme Connecticut 21.4°C
40 Old Saybrook Connecticut 21.4°C
41 Saybrook Manor Connecticut 21.4°C
42 Westbrook Connecticut 21.4°C
43 East Haddam Connecticut 21.3°C
44 Essex, Connecticut River, Connecticut Connecticut 21.3°C
45 Hadlyme, Connecticut River, Connecticut Connecticut 21.3°C
46 Lyme, highway bridge, Connecticut River, Connecticut Connecticut 21.3°C
47 Saybrook Jetty, Connecticut River, Connecticut Connecticut 21.3°C
48 Saybrook Point, Connecticut River, Connecticut Connecticut 21.3°C
49 Tylerville, Connecticut River, Connecticut Connecticut 21.3°C
50 Groton Connecticut 20.9°C

Coldest 10 in Connecticut in September

Same data the other way.

# Location September mean
1 West Mystic, Mystic River, Long Island Sound Connecticut 20.6°C
2 Mystic Connecticut 20.6°C
3 Noank Connecticut 20.6°C
4 Stonington Connecticut 20.6°C
5 New London, Thames River Connecticut 20.9°C
6 Norwich, Thames River, Connecticut Connecticut 20.9°C
7 Yale boathouse, Thames River, Connecticut Connecticut 20.9°C
8 Groton Connecticut 20.9°C
9 New London Connecticut 20.9°C
10 Niantic Connecticut 20.9°C

Other US states

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