Green Bay Sea Water Temperature
A temperate beach on the Coastal Waters, warmest around February at about 19.9°C. Today's reading, 7-day forecast, and monthly averages below.
Green Bay water temperature
Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges.
7-Day Water Temperature Forecast
Green Bay Monthly Water Temperature Averages
Historical monthly climatology. The warmest water in Green Bay occurs inJanuary, February, March, December — peaking at19.9°C (67.8°F) in February.
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 | 17.7°C | 19.6°C | 22.5°C | Cool / Refreshing (16°C – 20°C) |
| February | 18.1°C | 19.9°C | 21.3°C | Cool / Refreshing (16°C – 20°C) |
| March | 17.7°C | 19.3°C | 20.6°C | Cool / Refreshing (16°C – 20°C) |
| April | 16.3°C | 18°C | 19.3°C | Cool / Refreshing (16°C – 20°C) |
| May | 14.9°C | 16.6°C | 18.1°C | Cool / Refreshing (16°C – 20°C) |
| June | 14°C | 15.2°C | 16.7°C | Very Cold (< 16°C) |
| July | 12.6°C | 14.2°C | 15.3°C | Very Cold (< 16°C) |
| August | 12.9°C | 13.6°C | 14.6°C | Very Cold (< 16°C) |
| SeptemberCurrent | 12.9°C | 14°C | 15.1°C | Very Cold (< 16°C) |
| October | 13.7°C | 15.2°C | 16.5°C | Very Cold (< 16°C) |
| November | 15.1°C | 16.9°C | 19.2°C | Cool / Refreshing (16°C – 20°C) |
| December | 16.8°C | 18.4°C | 20.3°C | Cool / Refreshing (16°C – 20°C) |
Swimming FAQs for Green Bay
Is the sea warm enough to swim in Green Bay today?
Typical sea surface temperature in Green Bay this time of year is 14°C (57.2°F) — classified as Very Cold (< 16°C). Wetsuit strongly recommended. Sudden entry may cause cold shock. Suitable only for brief, brisk plunges. Live readings load automatically.
What are the warmest months for swimming in Green Bay?
The highest water temperatures in Green Bay typically occur duringJanuary, February, March, December, when monthly averages reach peak seasonal levels.
What is the typical water temperature in Green Bay in September?
Historically in September, water temperatures in Green Bay average around14°C (57.2°F), fluctuating between a recorded minimum of 12.9°C and a maximum of 15.1°C.