Massachusetts, United States
James Bay42.33°N, 71.03°WStation UN-MAS-MST

M Street Beach Sea Water Temperature

A cool beach on the James Bay, warmest around August at about 19°C. Today's reading, 7-day forecast, and monthly averages below.

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Water Temperature NowBuoy & Sentinel-3 SST

M Street Beach water temperature

17.6
63.7°FCool / Refreshing (16°C – 20°C)

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

+0°vs Sep avgJames Bay42.33°N, 71.03°W
Activity Index:SwimmingSnorkelingSurfingTypical conditions
Marine Atmosphere Grid Live Marine Feed
Coastal Air
19°C
66.4°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
17.6°C
63.7°F
Waves: 1m
Refreshing
ThuOct 1
17.9°C
64.2°F
Waves: 0.9m
Refreshing
FriOct 2
18°C
64.4°F
Waves: 0.7m
Refreshing
SatOct 3
17.9°C
64.2°F
Waves: 0.6m
Refreshing
SunOct 4
17.6°C
63.7°F
Waves: 0.7m
Refreshing
MonOct 5
17.3°C
63.1°F
Waves: 0.9m
Refreshing
TueOct 6
17.2°C
63°F
Waves: 1m
Refreshing
Forecast cooling trend: -0.4°C over 7 days at M Street Beach.
Confidence: High

M Street Beach Monthly Water Temperature Averages

Historical monthly climatology. The warmest water in M Street Beach occurs inJune, July, August, September — peaking at19°C (66.2°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)
6
Jan
4
Feb
4
Mar
6
Apr
11
May
15
Jun
18
Jul
19
Aug
Current
18
Sep
14
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°C5.5°C8°CVery Cold (< 16°C)
February2.3°C3.6°C5.3°CVery Cold (< 16°C)
March1.4°C3.8°C6.3°CVery Cold (< 16°C)
April4°C6.2°C9.1°CVery Cold (< 16°C)
May7.4°C10.5°C15.1°CVery Cold (< 16°C)
June12°C15.1°C18°CVery Cold (< 16°C)
July15.9°C18.4°C21.7°CCool / Refreshing (16°C – 20°C)
August16.5°C19°C21.7°CCool / Refreshing (16°C – 20°C)
SeptemberCurrent15.3°C17.6°C20.9°CCool / Refreshing (16°C – 20°C)
October10.6°C14.2°C17.1°CVery Cold (< 16°C)
November8.5°C10.7°C13.8°CVery Cold (< 16°C)
December5.6°C7.9°C10.3°CVery Cold (< 16°C)

Swimming FAQs for M Street Beach

Is the sea warm enough to swim in M Street Beach today?

Typical sea surface temperature in M Street Beach this time of year is 17.6°C (63.7°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 M Street Beach?

The highest water temperatures in M Street Beach typically occur duringJune, July, August, September, when monthly averages reach peak seasonal levels.

What is the typical water temperature in M Street Beach in September?

Historically in September, water temperatures in M Street Beach average around17.6°C (63.7°F), fluctuating between a recorded minimum of 15.3°C and a maximum of 20.9°C.

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M Street Beach Coastal Zone Map

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