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Is it too cold to swim in Stone Harbor?
The latest NASA JPL satellite analysis, dated November 3, 2026, gives 60°F (15.8°C) at the nearest water pixel. That is cold water.
Between 60°F and 70°F, which the National Center for Cold Water Safety rates as dangerous. It recommends a wetsuit or drysuit below 70°F. Temperature is only one factor: check rip current and surf alerts, and swim near lifeguards.
How cold is too cold to swim?Water temperature through the year
Average water temperature by month, satellite 2016–2025. Warmest in August.
Average ocean temperature by month
| Month | Average | Coldest year | Warmest year |
|---|---|---|---|
| January | 42°F | 36°F | 45°F |
| February | 40°F | 39°F | 43°F |
| March | 44°F | 41°F | 46°F |
| April | 50°F | 46°F | 53°F |
| May | 58°F | 56°F | 60°F |
| June | 68°F | 67°F | 69°F |
| July | 75°F | 72°F | 77°F |
| August | 75°F | 72°F | 78°F |
| September | 73°F | 72°F | 75°F |
| October | 66°F | 63°F | 68°F |
| November | 56°F | 54°F | 59°F |
| December | 47°F | 45°F | 49°F |
Other water temperature readings nearby
| Source | Water | Distance | Updated |
|---|---|---|---|
| Ludlum Thorofare at Sea Isle City NJ bay gauge | 59°F | 8.1 mi | 2 h ago |
| Cape May Harbor at Cape May NJ bay gauge | 60°F | 9.9 mi | 58 min ago |
| Cape May tide station | 61°F | 12 mi | 2 h ago |
| Great Egg Harbor Bay at Ocean City NJ bay gauge | 60°F | 19 mi | 88 min ago |
| Maurice River at Bivalve NJ bay gauge | 60°F | 19 mi | 58 min ago |
| Maurice R at Mauricetown NJ bay gauge | 59°F | 21 mi | 58 min ago |
| Beach Thorofare at Margate NJ bay gauge | 60°F | 24 mi | 56 min ago |
Water temperatures at nearby beaches
Frequently asked questions
Is it too cold to swim in Stone Harbor?
The latest NASA JPL satellite analysis, dated November 3, 2026, gives 60°F (15.8°C) at the nearest water pixel. That is cold water. Between 60°F and 70°F, which the National Center for Cold Water Safety rates as dangerous. It recommends a wetsuit or drysuit below 70°F. Temperature is only one factor: check rip current and surf alerts, and swim near lifeguards. How cold is too cold?
When is the water warmest at Stone Harbor?
Based on satellite data from 2016 to 2025, the water is warmest in August (average 75°F) and coldest in February (average 40°F).
Where does this water temperature come from?
We show NASA JPL’s daily MUR satellite analysis for the nearest water, about 0.2 mi away, when no suitable current in-water sensor is available. Satellite values are typically a degree or two cooler than afternoon readings at the shore. Satellite vs. buoy temperatures.
Sources: NASA JPL MUR satellite analysis; U.S. Geological Survey; NOAA National Data Buoy Center; forecast and alerts from the National Weather Service. Readings are provisional. All New Jersey water temperatures · Methodology