Stony Brook
New York, USA
Long-term weather forecast
Long-term weather forecast

July weather forecast and climate
Stony Brook, NY

Ocean temperature

In Julio, the average ocean temperature in Stony Brook, New York, is 72.1°F (22.3°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 72.1°F (22.3°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

The average length of the day in Julio in Stony Brook, New York, is 14.8h.

What is the water temperature in Julio in Stony Brook?

In Stony Brook, the average seawater temperature in Julio is 72.1°F (22.3°C). For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 72.1°F (22.3°C).

What is the average length of the day in Julio in Stony Brook?

In Julio, the average length of the day in Stony Brook is 14.8h.
Average sea temperature in July - Stony Brook, NY
  • Average sea temperature in July: 72.1°F

The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

Average daylight in July - Stony Brook, NY
  • Average daylight in July: 14.8h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).