Barnum Island
New York, USA
Long-term weather forecast
Long-term weather forecast

March weather forecast and climate
Barnum Island, NY

Ocean temperature

In Barnum Island, New York, the average seawater temperature in Marzo is 40.6°F (4.8°C).
Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.


In Marzo, the average length of the day in Barnum Island is 12h.

How cold is the water in Marzo in Barnum Island?

In Barnum Island, in Marzo, the average water temperature is 40.6°F (4.8°C). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

How many hours of daylight does Barnum Island have in Marzo?

In Barnum Island, the average length of the day in Marzo is 12h.
Average sea temperature in March - Barnum Island, NY
  • Average sea temperature in March: 40.7°F

The best month for swimming (with the highest average sea temperature) is August (74.1°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

Average daylight in March - Barnum Island, NY
  • Average daylight in March: 12h

The month with the longest days is June (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9.3h).