Massachusetts, United States
Coastal Waters41.30°N, 70.11°WStation UN-MAS-CLI

Cliff Beach Sea Water Temperature

A cool beach on the Coastal Waters, warmest around August at about 20.6°C. Today's reading, 7-day forecast, and monthly averages below.

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Water Temperature NowBuoy & Sentinel-3 SST

Cliff Beach water temperature

19.1
66.4°FCool / Refreshing (16°C – 20°C)

Invigorating and crisp. Tolerable for active swimming, but chilly for prolonged casual bathing.

+0°vs Sep avgCoastal Waters41.30°N, 70.11°W
Activity Index:SwimmingSnorkelingSurfingTypical conditions
Marine Atmosphere Grid Live Marine Feed
Coastal Air
21°C
69.1°F onshore
Wind Speed
12 km/h
Surface wind
Wave Height
0.8 m
Slight shore chop
Swell
0.6 m
Deep water swell
Wave Period
6 s
Peak interval
UV Index
—
Daily maximum
Sunrise
—
First morning light
Sunset
—
Golden hour close

7-Day Water Temperature Forecast

Open-Meteo ocean model
Today
WedSep 30
19.1°C
66.4°F
Waves: 1m
Refreshing
ThuOct 1
19.4°C
66.9°F
Waves: 0.9m
Refreshing
FriOct 2
19.5°C
67.1°F
Waves: 0.7m
Refreshing
SatOct 3
19.4°C
66.9°F
Waves: 0.6m
Refreshing
SunOct 4
19.1°C
66.4°F
Waves: 0.7m
Refreshing
MonOct 5
18.8°C
65.8°F
Waves: 0.9m
Refreshing
TueOct 6
18.7°C
65.7°F
Waves: 1m
Refreshing
Forecast cooling trend: -0.4°C over 7 days at Cliff Beach.
Confidence: High

Cliff Beach Monthly Water Temperature Averages

Historical monthly climatology. The warmest water in Cliff Beach occurs inJuly, August, September, October — peaking at20.6°C (69.1°F) in August.

Year-Round Water Temperature Curve (°C / °F)

Hover a bar for details
Current month Comfortable (20–24°C) Warm (24°C+) Cool (<20°C)
5
Jan
3
Feb
4
Mar
7
Apr
11
May
15
Jun
19
Jul
21
Aug
Current
19
Sep
15
Oct
11
Nov
8
Dec
Full 12-month data table — min / avg / max & swimming comfort
MonthMin Water TempAverage Water TempMax Water TempSwimming Comfort
January2.7°C5°C7.7°CVery Cold (< 16°C)
February1.9°C3.3°C5.2°CVery Cold (< 16°C)
March0.8°C4°C6.8°CVery Cold (< 16°C)
April4°C6.8°C11.1°CVery Cold (< 16°C)
May7.9°C10.5°C15.8°CVery Cold (< 16°C)
June10°C15.1°C17.8°CVery Cold (< 16°C)
July16.2°C19.2°C22.5°CCool / Refreshing (16°C – 20°C)
August17.6°C20.6°C24.1°CComfortable (20°C – 24°C)
SeptemberCurrent16.3°C19.1°C21.5°CCool / Refreshing (16°C – 20°C)
October11.9°C15.3°C18.6°CVery Cold (< 16°C)
November8.6°C11.1°C15.1°CVery Cold (< 16°C)
December4.7°C7.6°C9.7°CVery Cold (< 16°C)

Swimming FAQs for Cliff Beach

Is the sea warm enough to swim in Cliff Beach today?

Typical sea surface temperature in Cliff Beach this time of year is 19.1°C (66.4°F) — classified as Cool / Refreshing (16°C – 20°C). Invigorating and crisp. Tolerable for active swimming, but chilly for prolonged casual bathing. Live readings load automatically.

What are the warmest months for swimming in Cliff Beach?

The highest water temperatures in Cliff Beach typically occur duringJuly, August, September, October, when monthly averages reach peak seasonal levels.

What is the typical water temperature in Cliff Beach in September?

Historically in September, water temperatures in Cliff Beach average around19.1°C (66.4°F), fluctuating between a recorded minimum of 16.3°C and a maximum of 21.5°C.

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Cliff Beach Coastal Zone Map

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