Monthly weather forecast and climate
Mystic Island, NJ

Weather in January

In Mystic Island, New Jersey, the average seawater temperature in January is 43.3°F (6.3°C). Note: Swimming in 43.3°F (6.3°C) is considered dangerous. Weather in January »

Weather in February

The month with the coldest seawater in Mystic Island, New Jersey, is February, with an average ocean temperature of 40.8°F (4.9°C). Note: For swimming, this is considered very dangerous and immediately life-threatening. Weather in February »

Weather in March

In Mystic Island, New Jersey, in March, the average water temperature is 41.2°F (5.1°C). Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in March »

Weather in April

In April, the average ocean temperature in Mystic Island, New Jersey, is 46.6°F (8.1°C). Note: Swimming in 46.6°F (8.1°C) is considered dangerous. Weather in April »

Weather in May

In Mystic Island, New Jersey, in May, the average water temperature is 54.9°F (12.7°C). Note: Swimming in 54.9°F (12.7°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation. Weather in May »

Weather in June

In June, the average ocean temperature in Mystic Island, New Jersey, is 66.2°F (19°C). Note: For most, swimming in 66.2°F (19°C) is not an enjoyable activity. Weather in June »

Weather in July

In Mystic Island, New Jersey, the average seawater temperature in July is 73.4°F (23°C). Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 73.4°F (23°C) water. Weather in July »

Weather in August

August is the month with the warmest seawater in Mystic Island, New Jersey, with an average ocean temperature of 75.7°F (24.3°C). Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 75.7°F (24.3°C) water. Weather in August »

Weather in September

In Mystic Island, New Jersey, in September, the average water temperature is 71.2°F (21.8°C). Note: For swimming, a surface water temperature of 71.2°F (21.8°C) is not enjoyable for the majority. Weather in September »

Weather in October

In October, the average ocean temperature in Mystic Island, New Jersey, is 64.8°F (18.2°C). Note: For swimming, a surface water temperature of 64.8°F (18.2°C) is not enjoyable for the majority. Weather in October »

Weather in November

In Mystic Island, New Jersey, in November, the average water temperature is 55.8°F (13.2°C). Note: Swimming in 55.8°F (13.2°C) is considered dangerous. Weather in November »

Weather in December

In December, the average ocean temperature in Mystic Island, New Jersey, is 48.6°F (9.2°C). Note: Swimming in 48.6°F (9.2°C) is considered dangerous. Weather in December »
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FAQ

What month is the ocean coldest in Mystic Island?

With an average ocean temperature of 40.8°F (4.9°C), February is the month with the coldest seawater.

When are the longest days in Mystic Island?

June has the longest days of the year in Mystic Island, New Jersey, with an average of 14.9h of daylight.

What is the month with the warmest ocean in Mystic Island?

The month with the warmest seawater in Mystic Island, New Jersey, is August, with an average ocean temperature of 75.7°F (24.3°C).

What is the month with the shortest days in Mystic Island?

The month with the shortest days in Mystic Island is December, with an average of 9.4h of daylight.

Average sea temperature
Mystic Island, NJ

Average sea temperature - Mystic Island, NJ

The best month for swimming (with the highest average sea temperature) is August (75.8°F).
The coldest month (with the lowest average sea temperature) is February (40.8°F).

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Average daylight
Mystic Island, NJ

Average daylight - Mystic Island, NJ

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

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