Long Beach Island, NJ
Water temperature by month
The ocean off Long Beach Island is warmest in August, averaging 75°F at the Barnegat buoy, and coldest in February, at 42°F. At the Atlantic City tide gauge the warmest month is August, at 73°F, and the coldest is February, at 38°F. Today's reading is on the conditions page.
| Month | Buoy 44091, off Barnegat Inlet | Atlantic City, NJ, NOAA tide gauge |
|---|---|---|
| January | 45.7°F | 39.6°F |
| February | 42.3°F | 38.4°F |
| March | 43.0°F | 42.1°F |
| April | 47.8°F | 48.8°F |
| May | 55.6°F | 56.5°F |
| June | 66.1°F | 64.6°F |
| July | 74.7°F | 68.9°F |
| August | 75.2°F | 72.9°F |
| September | 72.1°F | 72.1°F |
| October | 65.7°F | 64.2°F |
| November | 58.4°F | 53.8°F |
| December | 50.5°F | 45.2°F |
Where these are measured
Neither column is measured at the beach. Buoy 44091 floats about 18 miles off Barnegat Inlet. Its column is this site's average of the buoy's readings from 2015 through 2025, from NOAA's National Data Buoy Center: the mean for each month of each year, then the mean of those years. A month counts for a year when the buoy reported on at least 20 of its days, so each month rests on 9 to 11 years.
The Atlantic City column is the monthly average NOAA's National Centers for Environmental Information publishes for its tide gauge in Atlantic City, south of Long Beach Island. Its table does not say which years its averages cover, so the two columns may span different years as well as different places. They differ most in January, by 6.1°F, when the buoy reads warmer than the gauge.
Buoy averages computed October 21, 2026. Sources: NDBC station 44091 history, NCEI Coastal Water Temperature Guide.