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Coldest beach in Connecticut

61 coastal locations in Connecticut ranked by year-round average sea temperature, coldest first. The state-wide average is 13.2°C. The coldest month is February at 3.1°C. Click any beach for its 30-day chart and 10-year history.

Coldest year-round

Groton

12.9°C annual mean

State-wide average

13.2°C

across 61 Connecticut coastal locations

Coldest month

February

3.1°C state-wide average

What the water feels like in February

Water at this temperature is freezing cold, can cause pain and takes your breath away. Unless you are very experienced and are under strict supervision, swimming in this water for more than a few minutes can be very dangerous. Be careful, stay safe, and enjoy the rush of endorphins and exhilaration from a brief cold water swim.

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

Month by month around the Connecticut coast

Connecticut sea temperatures swing from 3.1°C in February to 23.3°C in August on average across the coast. That's a spread of 20°C. Pick a single month for a focused ranking:

Connecticut sea temperature map

Today's pin colours show the latest daily reading at every Connecticut beach we track. Drag and zoom; click any pin for that beach's full page.

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 beaches in Connecticut

Sorted by year-round average. Click any beach for its 30-day chart, monthly profile, and 10-year history.

# Location Annual mean
1 Cos Cob Harbor, Connecticut Connecticut 13.4°C
2 East Norwalk Connecticut 13.4°C
3 Long Neck Point, Long Island Sound Connecticut 13.4°C
4 Mianus Connecticut 13.4°C
5 Rowayton, Fivemile River, Connecticut Connecticut 13.4°C
6 Saugatuck, Saugatuck River, Long Island Sound Connecticut 13.4°C
7 South Norwalk, Connecticut Connecticut 13.4°C
8 South Norwalk, Norwalk River Connecticut 13.4°C
9 Southport, Southport Harbor Connecticut 13.4°C
10 Branford Connecticut 13.4°C
11 Bridgeport Connecticut 13.4°C
12 Milford Connecticut 13.4°C
13 New Haven Connecticut 13.4°C
14 West Haven Connecticut 13.4°C
15 Black Rock Harbor, Cedar Creek Connecticut 13.4°C
16 Gulf Beach, Connecticut Connecticut 13.4°C
17 Long Hill, Housatonic River, Connecticut Connecticut 13.4°C
18 Milford Harbor, Connecticut Connecticut 13.4°C
19 Shelton, Housatonic River, Connecticut Connecticut 13.4°C
20 Sniffens Point, Housatonic River, Connecticut Connecticut 13.4°C
21 Stratford, I-95 bridge, Housatonic River, Connecticut Connecticut 13.4°C
22 Clinton Connecticut 13.1°C
23 Guilford Connecticut 13.1°C
24 Hammonasset Beach Connecticut 13.1°C
25 Madison Connecticut 13.1°C
Show 25 more ▸
26 Woodmont Connecticut 13.1°C
27 Haddam, Connecticut River, Connecticut Connecticut 13.1°C
28 East Haddam Connecticut 13.0°C
29 Essex, Connecticut River, Connecticut Connecticut 13.0°C
30 Hadlyme, Connecticut River, Connecticut Connecticut 13.0°C
31 Lyme, highway bridge, Connecticut River, Connecticut Connecticut 13.0°C
32 Saybrook Jetty, Connecticut River, Connecticut Connecticut 13.0°C
33 Saybrook Point, Connecticut River, Connecticut Connecticut 13.0°C
34 Tylerville, Connecticut River, Connecticut Connecticut 13.0°C
35 Old Lyme Connecticut 13.0°C
36 Old Saybrook Connecticut 13.0°C
37 Saybrook Manor Connecticut 13.0°C
38 Westbrook Connecticut 13.0°C
39 West Mystic, Mystic River, Long Island Sound Connecticut 13.0°C
40 New London, Thames River Connecticut 12.9°C
41 Norwich, Thames River, Connecticut Connecticut 12.9°C
42 Yale boathouse, Thames River, Connecticut Connecticut 12.9°C
43 Mystic Connecticut 12.9°C
44 Noank Connecticut 12.9°C
45 Stonington Connecticut 12.9°C
46 Groton Connecticut 12.9°C
47 New London Connecticut 12.9°C
48 Niantic Connecticut 12.9°C
49 Ocean Beach Park Connecticut 12.9°C
50 Waterford Connecticut 12.9°C

Warmest 10 in Connecticut for contrast

Same data flipped. The warmest year-round spots in the state.

# Location Annual mean
1 Great Captain Island Connecticut 13.9°C
2 Byram Connecticut 13.6°C
3 Cos Cob Connecticut 13.6°C
4 Greenwich Connecticut 13.6°C
5 Old Greenwich Connecticut 13.6°C
6 Stamford Connecticut 13.6°C
7 Darien Connecticut 13.6°C
8 Fairfield Connecticut 13.6°C
9 Norwalk Connecticut 13.6°C
10 Westport Connecticut 13.6°C

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