The water will feel freezing / baltic. You would have to be insane or getting paid to want to get in water this cold! If you do make sure you are wearing a top end drysuit and all the accessories.
Air temperature
°C - °C
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The measurements for the water temperature in Mystic Island, New Jersey are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.
*Live data may vary from satellite readings for a number of reasons. These include local factors, depth of smapling and time of day.
The graph below shows the range of monthly Mystic Island water temperature derived from many years of historical sea surface temperature data.
Maximum and minimum monthly sea temperatures in Mystic Island
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Min °C
3
2.9
3.1
4.4
8.2
14.7
20.9
22
19.5
14.5
10.9
5.9
Max °C
8.3
6.4
6.9
11.7
16.5
23.1
25.3
26.6
24.1
21.4
15
11.8
Min °F
39.5
38.6
39.1
42.8
50
61.8
71.4
73.4
68.9
60.8
53.2
44.9
Max °F
44.8
42.1
42.9
50.1
58.3
70.2
75.8
78
73.5
67.7
57.3
50.8
The warmest water temperature is in August with an average around 75.7°F / 24.3°C. The coldest month is February with an average water temperature of 40.3°F / 4.6°C.
Whilst sea temperatures for Mystic Island are as accurate as current data allows, there may be slight local and regional variations depending on conditions. Time of day and wind direction may have a temporary local effect as can water flows from neraby rivers.