Groton Long Point Main Beach Sea Water Temperature
A temperate beach on the James Bay, warmest around August at about 21.7°C. Today's reading, 7-day forecast, and monthly averages below.
Groton Long Point Main Beach water temperature
Pleasant and revitalizing. Great for most beachgoers and active recreational swimming.
7-Day Water Temperature Forecast
Groton Long Point Main Beach Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Groton Long Point Main Beach occurs inJuly, August, September, October — peaking at21.7°C (71.1°F) in August.
Year-Round Water Temperature Curve (°C / °F)
Hover a bar for detailsFull 12-month data table — min / avg / max & swimming comfort
| Month | Min Water Temp | Average Water Temp | Max Water Temp | Swimming Comfort |
|---|---|---|---|---|
| January | 2.5°C | 6°C | 8.8°C | Very Cold (< 16°C) |
| February | 1.7°C | 3.9°C | 6.1°C | Very Cold (< 16°C) |
| March | 1.2°C | 4.4°C | 8.1°C | Very Cold (< 16°C) |
| April | 3.9°C | 7°C | 11.3°C | Very Cold (< 16°C) |
| May | 9.1°C | 11.3°C | 16.3°C | Very Cold (< 16°C) |
| June | 11.8°C | 16.5°C | 20.4°C | Cool / Refreshing (16°C – 20°C) |
| July | 18.3°C | 20.5°C | 22.9°C | Comfortable (20°C – 24°C) |
| August | 19.8°C | 21.7°C | 24.2°C | Comfortable (20°C – 24°C) |
| SeptemberCurrent | 18.2°C | 20.4°C | 22.7°C | Comfortable (20°C – 24°C) |
| October | 14.5°C | 17.4°C | 19.4°C | Cool / Refreshing (16°C – 20°C) |
| November | 10.6°C | 13.2°C | 16.3°C | Very Cold (< 16°C) |
| December | 6.7°C | 9.2°C | 11.9°C | Very Cold (< 16°C) |
Swimming FAQs for Groton Long Point Main Beach
Is the sea warm enough to swim in Groton Long Point Main Beach today?
Typical sea surface temperature in Groton Long Point Main Beach this time of year is 20.4°C (68.7°F) — classified as Comfortable (20°C – 24°C). Pleasant and revitalizing. Great for most beachgoers and active recreational swimming. Live readings load automatically.
What are the warmest months for swimming in Groton Long Point Main Beach?
The highest water temperatures in Groton Long Point Main Beach typically occur duringJuly, August, September, October, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Groton Long Point Main Beach in September?
Historically in September, water temperatures in Groton Long Point Main Beach average around20.4°C (68.7°F), fluctuating between a recorded minimum of 18.2°C and a maximum of 22.7°C.