Where is Hempstead Harbor?

Hempstead Harbor is a bay in New York.

What is the water temperature at Hempstead Harbor?

As of August 21, 2026, the water temperature at Hempstead Harbor in New York is 75°F (24°C), measured by NOAA buoy BATN6, 21 miles away.

Updated June 13, 2026

Hempstead Harbor

Bay

Comfortable for a swim today

Good to swim

Comfortable for a swim today: water temperature is 75°F, within the comfortable 70–86°F range.

Water temperature is 75°F, within the comfortable 70–86°F range.
Heavy rain today can raise bacteria levels near outfalls and river mouths.

See full conditions ↓Can I swim today? →

Good to swimGood conditions today

Bay on north coast of Long Island, New York

Interactive map not available

Comfortable for a swim today

Good to swim

Comfortable for a swim today: water temperature is 75°F, within the comfortable 70–86°F range.

Water temperature is 75°F, within the comfortable 70–86°F range. — NOAA buoy BATN6, as of Aug 21, 10:30 PM UTC
Heavy rain today can raise bacteria levels near outfalls and river mouths.

Water temp

75°F

24°C

No official beach-advisory feed for New York yet — follow posted signs and local guidance.

Live data from NOAA buoy BATN6 (21 mi away), as of Aug 21, 10:30 PM UTC.

Live map near here →

Weather at Hempstead Harbor

H: 74° L: 64°

Overcast

71°

Feels like 72°

Precipitation

86%

Humidity

85%

Wind

8 mph

UV Index

0.1

Water Conditions:

🏊Cool but swimmable

12 AM

64°

3 AM

64°

6 AM

64°

9 AM

68°

12 PM

73°

3 PM

74°

6 PM

71°

9 PM

68°

Pack smarter for Hempstead Harbor

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Quick-Dry TowelEasy to pack and useful after swims, spray, or surprise rain.

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Frequently asked questions

Where is Hempstead Harbor?: Hempstead Harbor is a bay in New York.
What is the water temperature at Hempstead Harbor?: As of August 21, 2026, the water temperature at Hempstead Harbor in New York is 75°F (24°C), measured by NOAA buoy BATN6, 21 miles away.
Can you swim at Hempstead Harbor?: Comfortable for a swim today: water temperature is 75°F, within the comfortable 70–86°F range. Checked August 21, 2026.

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Location & Contact

New York

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