Groton 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 Beach water temperature
Pleasant and revitalizing. Great for most beachgoers and active recreational swimming.
7-Day Water Temperature Forecast
Groton Beach Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Groton 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 Beach
Is the sea warm enough to swim in Groton Beach today?
Typical sea surface temperature in Groton 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 Beach?
The highest water temperatures in Groton Beach typically occur duringJuly, August, September, October, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Groton Beach in September?
Historically in September, water temperatures in Groton Beach average around20.4°C (68.7°F), fluctuating between a recorded minimum of 18.2°C and a maximum of 22.7°C.