July is a popular month to ask about Fire Island because conditions can shift week to week along this coast. Expect the water near 22.0°C, with daily variation from wind, tides and recent storms. We refresh the live value from Open-Meteo Marine every hour, so the headline above always reflects the current state of the Atlantic Ocean.
Fire Island sea temperature in July — averages 22.0°C
The sea at Fire Island in United States averages 22.0°C during July, based on long-run climatology for the Atlantic Ocean. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · July
22.0°C
warm · Excellent
Live water now
…
Recommended wetsuit
Rash vest or swimsuit
At 22.0°C most swimmers and surfers are comfortable in a swimsuit or thin rash top.
Monthly comparison
Yes — comfortable for most swimmers · Fire Island
Can you swim at Fire Island in June? — 18.0°C water18.0°CCan you swim at Fire Island in July? — 22.0°C water22.0°CCan you swim at Fire Island in August? — 23.0°C water23.0°CCan you swim at Fire Island in September? — 20.0°C water20.0°CCan you swim at Fire Island in October? — 16.0°C water16.0°CCan you swim at Fire Island in November? — 11.0°C water11.0°C
Frequently asked questions
What is the average sea temperature at Fire Island in July?
Fire Island averages 22.0°C in July, based on long-run climatology for the Atlantic Ocean.
Is the sea warm enough to swim at Fire Island in July?
Yes, most swimmers find 22.0°C comfortable for unrestricted swimming.
Do I need a wetsuit at Fire Island in July?
Most swimmers don't need a wetsuit; a rash vest helps for longer sessions.