What is the average water temperature in Connecticut?

The current average water temperature across Connecticut's monitored water bodies is 55.6°F.

🌡️

Connecticut Water Temperatures

Q: What is the warmest lake in Connecticut today?

Quinebaug River At Quinebaug, Ct at 73°F.

Current lake & river temperatures in Connecticut — updated daily from USGS sensors.

With Data

55.6°F

State Avg

73°F

Warmest

73°F

Warmest

Quinebaug River At Quinebaug, Ct

55.6°F

State Average

75 water bodies

32.9°F

Coldest

Bunnell Brook Near Burlington, Ct

🏊

Swimming Conditions

🚫 Too cold for most swimmers

Based on avg 55.6°F

🎣

Fishing Conditions

🎣 Good — trout, walleye, bass

Based on avg 55.6°F

Connecticut — Ranked by Temperature

17 with data

#	Water Body	°F	°C	Condition	🏊	Date
1	Quinebaug River At Quinebaug, Ct River	73°	22.8°	🌤️ Comfortable	✅ Good	Sep 27
2	Connecticut River At Thompsonville, Ct River	72.5°	22.5°	🌤️ Comfortable	✅ Good	Aug 23
3	Still River At Route 7 At Brookfield Center, Ct River	70.2°	21.2°	🌤️ Comfortable	⚠️ Brisk	Sep 16
4	Hubbard River Near West Hartland, Ct River	70°	21.1°	🌤️ Comfortable	⚠️ Brisk	Aug 6
5	Connecticut River At Middle Haddam, Ct River	67.8°	19.9°	🌤️ Comfortable	⚠️ Brisk	Sep 29
6	West Branch Farmington River At Riverton, Ct River	64.6°	18.1°	🌊 Cool	🚫 Cold	Oct 2
7	Housatonic River At Stevenson, Ct River	62.6°	17°	🌊 Cool	🚫 Cold	Oct 10
8	Mattabesset River At Route 372 At East Berlin River	58.1°	14.5°	🌊 Cool	🚫 Cold	Sep 29
9	Housatonic River Near New Milford, Ct River	57.9°	14.4°	🌊 Cool	🚫 Cold	May 18
10	Hockanum River Near East Hartford, Ct River	57.9°	14.4°	🌊 Cool	🚫 Cold	Oct 18
11	Quinnipiac River At Wallingford, Ct River	54°	12.2°	❄️ Cold	⛔ Very cold	Apr 5
12	Willimantic River Near Coventry, Ct River	46.8°	8.2°	❄️ Cold	⛔ Very cold	Oct 29
13	Eightmile River At North Plain, Ct River	42.8°	6°	🧊 Very Cold	⛔ Very cold	Mar 17
14	East Branch Eightmile River Near North Lyme, Ct River	42.1°	5.6°	🧊 Very Cold	⛔ Very cold	Feb 27
15	Salmon River Near East Hampton, Ct River	37.4°	3°	🧊 Very Cold	⛔ Very cold	Feb 4
16	Natchaug River At Marcy Rd. Near Chaplin, Ct River	34.5°	1.4°	🧊 Very Cold	⛔ Very cold	Feb 12
17	Bunnell Brook Near Burlington, Ct River	32.9°	0.5°	🧊 Very Cold	⛔ Very cold	Jan 5
18	Shepaug River At Peters Dam At Woodville, Ct River	—	—	—	—	—
19	Fivemile River Near New Canaan, Ct River	—	—	—	—	—
20	Quinebaug River At West Thompson, Ct River	—	—	—	—	—
21	Shepaug R Nr Roxbury, Ct Lake	—	—	—	—	—
22	Saugatuck R Below Saugatuck Res Nr Lyons Plain, Ct Lake	—	—	—	—	—
23	Shetucket River Near Willimantic, Ct River	—	—	—	—	—
24	Coginchaug River At Middlefield, Ct River	—	—	—	—	—
25	Naugatuck River At Thomaston, Ct River	—	—	—	—	—
26	Fenton River At Mansfield, Ct River	—	—	—	—	—
27	Nepaug R Nr Nepaug, Ct. Lake	—	—	—	—	—
28	Housatonic River At Falls Village, Ct River	—	—	—	—	—
29	Rooster River At Fairfield, Ct River	—	—	—	—	—
30	Rippowam River At Stamford, Ct. River	—	—	—	—	—
31	Bride Brook Nr East Lyme, Ct River	—	—	—	—	—
32	Connecticut River At Hartford, Ct River	—	—	—	—	—
33	Mill River Near Hamden, Ct River	—	—	—	—	—
34	Weekeepeemee River At Hotchkissville, Ct River	—	—	—	—	—
35	Willimantic River At Merrow Rd. Near Merrow, Ct River	—	—	—	—	—
36	Little River At Harrisville, Ct River	—	—	—	—	—
37	Indian River Near Clinton, Ct River	—	—	—	—	—
38	Pootatuck River At Sandy Hook, Ct River	—	—	—	—	—
39	Saugatuck River Near Westport, Ct River	—	—	—	—	—
40	Quinebaug River At Putnam, Ct River	—	—	—	—	—
41	Farm River At Totoket Road At Totoket, Ct River	—	—	—	—	—
42	Sasco Brook Near Southport, Ct River	—	—	—	—	—
43	Shetucket River At Taftville, Ct River	—	—	—	—	—
44	Saugatuck River Near Redding, Ct River	—	—	—	—	—
45	Natchaug River At Willimantic, Ct River	—	—	—	—	—
46	Broad Brook At Broad Brook, Ct River	—	—	—	—	—
47	Muddy River Near East Wallingford, Ct River	—	—	—	—	—
48	Hop Brook Near Naugatuck, Ct River	—	—	—	—	—
49	Pendleton Hill Brook Near Clarks Falls, Ct River	—	—	—	—	—
50	Norwalk River At South Wilton, Ct River	—	—	—	—	—
51	Yantic River At Yantic, Ct River	—	—	—	—	—
52	Farmington River At Tariffville, Ct River	—	—	—	—	—
53	Nonewaug River At Minortown, Ct River	—	—	—	—	—
54	Pawcatuck River At Westerly, Ri River	—	—	—	—	—
55	French River At North Grosvenordale, Ct River	—	—	—	—	—
56	Pootatuck River At Berkshire River	—	—	—	—	—
57	Aspetuck River At Aspetuck, Ct River	—	—	—	—	—
58	Still River At Robertsville, Ct River	—	—	—	—	—
59	Naugatuck River At Beacon Falls, Ct River	—	—	—	—	—
60	Little River Near Hanover, Ct River	—	—	—	—	—
61	Salmon Creek At Lime Rock, Ct River	—	—	—	—	—
62	Mill River Near Fairfield, Ct River	—	—	—	—	—
63	Mount Hope River Near Warrenville, Ct River	—	—	—	—	—
64	Byram River At Pemberwick, Ct River	—	—	—	—	—
65	North Branch Park River At Hartford, Ct River	—	—	—	—	—
66	Housatonic River At Gaylordsville, Ct River	—	—	—	—	—
67	Pomperaug River At Southbury, Ct River	—	—	—	—	—
68	Willimantic River Near Mansfield Depot, Ct River	—	—	—	—	—
69	Stony Brook Near West Suffield, Ct River	—	—	—	—	—
70	Honeypot Brook At Creamery Road At Cheshire, Ct River	—	—	—	—	—
71	Naugatuck River At Waterbury, Ct River	—	—	—	—	—
72	Ridgefield Brook At Shields Lane Nr Ridgefield, Ct River	—	—	—	—	—
73	Quinebaug River At Jewett City, Ct River	—	—	—	—	—
74	Farmington River At Unionville, Ct River	—	—	—	—	—
75	Quinnipiac River At Southington, Ct River	—	—	—	—	—

Quinebaug River At Quinebaug, Ct River

73°F

🌤️ Comfortable

Connecticut River At Thompsonville, Ct River

72.5°F

🌤️ Comfortable

Still River At Route 7 At Brookfield Center, Ct River

70.2°F

🌤️ Comfortable

Hubbard River Near West Hartland, Ct River

70°F

🌤️ Comfortable

Connecticut River At Middle Haddam, Ct River

67.8°F

🌤️ Comfortable

West Branch Farmington River At Riverton, Ct River

64.6°F

🌊 Cool

Housatonic River At Stevenson, Ct River

62.6°F

🌊 Cool

Mattabesset River At Route 372 At East Berlin River

58.1°F

🌊 Cool

Housatonic River Near New Milford, Ct River

57.9°F

🌊 Cool

Hockanum River Near East Hartford, Ct River

57.9°F

🌊 Cool

Quinnipiac River At Wallingford, Ct River

54°F

❄️ Cold

Willimantic River Near Coventry, Ct River

46.8°F

❄️ Cold

Eightmile River At North Plain, Ct River

42.8°F

🧊 Very Cold

East Branch Eightmile River Near North Lyme, Ct River

42.1°F

🧊 Very Cold

Salmon River Near East Hampton, Ct River

37.4°F

🧊 Very Cold

Natchaug River At Marcy Rd. Near Chaplin, Ct River

34.5°F

🧊 Very Cold

Bunnell Brook Near Burlington, Ct River

32.9°F

🧊 Very Cold

Shepaug River At Peters Dam At Woodville, Ct River

—

Fivemile River Near New Canaan, Ct River

—

Quinebaug River At West Thompson, Ct River

—

More Connecticut Resources

🗺️ Connecticut Water Levels 🎣 Weekly Fishing Report ⛵ Boat Ramp Status 🌵 Drought Conditions 🌡️ All States

❓ Connecticut Water Temperature FAQ

What is the warmest lake in Connecticut today?

Based on our latest USGS data, Quinebaug River At Quinebaug, Ct is currently the warmest water body in Connecticut at 73°F.

Which Connecticut lakes are good for swimming right now?

Lakes with water temperatures above 72°F are generally comfortable for swimming. Currently, Connecticut's average water temperature is 55.6°F — check individual lakes above for specific conditions.

What is the best water temperature for fishing in Connecticut?

The optimal temperature range depends on your target species. For bass fishing, look for water bodies between 65–75°F. For trout, target the coldest water bodies in Connecticut — typically 50–65°F. Use the table above to identify which lakes are in the ideal range for your target species.

🔬 Data Methodology & Sources

Water temperature readings on this site are collected from USGS (United States Geological Survey) monitoring stations installed at lakes, rivers, and reservoirs across the country. Sensors measure water surface temperature in Celsius, which is converted to Fahrenheit for display. Data is retrieved and stored daily. Temperatures shown reflect the most recent available sensor reading for each water body, typically from the past 1–30 days depending on station reporting frequency.

⚠️ Water temperatures can vary significantly across a water body due to depth, currents, and time of day. Sensor readings represent conditions at the monitoring station location. Always exercise caution when swimming and consult local authorities for official safety advisories.