Monthly weather forecast and climate
Islip, NY

Weather in January

January, the same as December, is a wintry winter month in Islip, New York, with average temperature ranging between min 30°F (-1.1°C) and max 37.9°F (3.3°C). The coldest month is January, with an average high-temperature of 37.9°F (3.3°C) and an average low-temperature of 30°F (-1.1°C). Weather in January »

Weather in February

The last month of the winter, February, is also a wintry month in Islip, New York, with temperature in the range of an average high of 39.7°F (4.3°C) and an average low of 31.1°F (-0.5°C). In Islip, the average high-temperature in February is relatively the same as in January - a still cold 39.7°F (4.3°C). Weather in February »

Weather in March

March, the first month of the spring, in Islip, is a chilly month, with average temperature fluctuating between 44.2°F (6.8°C) and 36.1°F (2.3°C). In March, the average high-temperature is relatively the same as in February - a chilly 44.2°F (6.8°C). Weather in March »

Weather in April

April is a cool spring month in Islip, New York, with temperature in the range of an average high of 52.9°F (11.6°C) and an average low of 45.1°F (7.3°C). In April, the average high-temperature marginally rises, from a frosty 44.2°F (6.8°C) in March, to a fresh 52.9°F (11.6°C). Weather in April »

Weather in May

May, the last month of the spring, in Islip, is a comfortable month, with average temperature ranging between min 54.5°F (12.5°C) and max 62.2°F (16.8°C). In May, the average high-temperature increases, from a cool 52.9°F (11.6°C) in April, to an enjoyable 62.2°F (16.8°C). Weather in May »

Weather in June

June, the first month of the summer, in Islip, is an agreeable month, with temperature in the range of an average low of 63.9°F (17.7°C) and an average high of 71.4°F (21.9°C). In June, the average high-temperature rises, from an enjoyable 62.2°F (16.8°C) in May, to a pleasant 71.4°F (21.9°C). Weather in June »

Weather in July

July in Islip, New York, is a warm summer month, with average temperature fluctuating between 79°F (26.1°C) and 71.8°F (22.1°C). With an average high-temperature of 79°F (26.1°C) and an average low-temperature of 71.8°F (22.1°C), July is the warmest month. Weather in July »

Weather in August

August, the last month of the summer, in Islip, is also a moderately hot month, with temperature in the range of an average high of 78.4°F (25.8°C) and an average low of 72°F (22.2°C). In Islip, the average high-temperature is essentially the same as in July - a still moderately hot 78.4°F (25.8°C). Weather in August »

Weather in September

September, the first month of the autumn, in Islip, is still a pleasant month, with average temperature ranging between min 65.3°F (18.5°C) and max 72.1°F (22.3°C). In September, the average high-temperature marginally drops, from a moderately hot 78.4°F (25.8°C) in August, to an agreeable 72.1°F (22.3°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Islip, New York, with temperature in the range of an average low of 55.8°F (13.2°C) and an average high of 62.4°F (16.9°C). In October, the average high-temperature drops, from an agreeable 72.1°F (22.3°C) in September, to an enjoyable 62.4°F (16.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Islip, New York, with temperature in the range of an average low of 44.2°F (6.8°C) and an average high of 52°F (11.1°C). In Islip, New York, the average high-temperature decreases, from an enjoyable 62.4°F (16.9°C) in October, to a fresh 52°F (11.1°C). Weather in November »

Weather in December

The first month of the winter, December, is also a frosty month in Islip, New York, with average temperature ranging between max 43.9°F (6.6°C) and min 36.9°F (2.7°C). In December, the average high-temperature marginally drops, from a fresh 52°F (11.1°C) in November, to a frosty 43.9°F (6.6°C). Weather in December »
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FAQ

What is the coldest month in Islip?

The coldest month in Islip is January, with an average high-temperature of 37.9°F (3.3°C) and an average low-temperature of 30°F (-1.1°C).

How much does it rain in Islip?

Throughout the year, there are 153.2 rainfall days, and 34.45" (875mm) of precipitation is accumulated.

What is the driest month in Islip?

The month with the least rainfall in Islip, New York, is January when the rain falls for 7.6 days and typically collects 2.05" (52mm) of precipitation.

When does it snow in Islip?

Months with snowfall in Islip are January through March, October through December.

How many days does it snow in Islip?

Throughout the year, there are 13 snowfall days, and 5.87" (149mm) of snow is accumulated.

What are the months with the lowest UV index in Islip?

Months with the lowest UV index in Islip, New York, are January through March and December, with an average maximum UV index of 2.

What is the month with the coldest ocean in Islip?

February is the month with the coldest seawater, with an average ocean temperature of 39.7°F (4.3°C).

What is the month with the least sunshine in Islip?

February has the least sunshine of the year in Islip, with an average of 4.8h of sunshine.

When does it snow the most in Islip?

The month with the most snowfall is March when snow falls for 2.6 days and typically aggregates up to 1.97" (50mm) of snow.

When it does not snow in Islip?

April through September are months without snowfall in Islip.

What are the most humid months in Islip?

Months with the highest humidity in Islip, New York, are May and June, with an average relative humidity of 77%.

When are the longest days in Islip?

The month with the longest days in Islip is June, with an average of 15.1h of daylight.

When is the highest UV index in Islip?

Months with the highest UV index in Islip, New York, are June through August, with an average maximum UV index of 6.

What is the warmest month in Islip?

With an average high-temperature of 79°F (26.1°C) and an average low-temperature of 71.8°F (22.1°C), July is the warmest month in Islip.

What is the rainiest month in Islip?

July is the month with the most rainfall. Rain falls for 17.9 days and accumulates 3.86" (98mm) of precipitation.

What month has the most sunshine in Islip?

The month with the most sunshine in Islip, New York, is July, with an average of 10.8h of sunshine.

When is the ocean warmest in Islip?

The month with the warmest seawater is August, with an average ocean temperature of 73.9°F (23.3°C).

What is the least humid month in Islip?

The least humid month is November, with an average relative humidity of 71%.

What is the month with the shortest days in Islip?

The month with the shortest days is December, with an average of 9.3h of daylight.

Average pressure
Islip, NY

Average pressure - Islip, NY

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed
Islip, NY

Average wind speed - Islip, NY

The windiest month (with the highest average wind speed) is January (13.4mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).

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Average rainfall
Islip, NY

Average rainfall - Islip, NY

The wettest month (with the highest rainfall) is July (3.86").
The driest month (with the least rainfall) is January (2.05").

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Average rainfall days
Islip, NY

Average rainfall days - Islip, NY

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (7.6 days).

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Average snowfall
Islip, NY

Average snowfall - Islip, NY

The month with the highest snowfall is March (1.97").
Months with the least snowfall are April, May, June, July, August and September (0").

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Average snowfall days
Islip, NY

Average snowfall days - Islip, NY

The month with the highest number of snowfall days is February (4.2 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature
Islip, NY

Average sea temperature - Islip, NY

The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

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Average daylight / Average sunshine
Islip, NY

Average daylight / Average sunshine - Islip, NY

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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Average sunshine days
Islip, NY

Average sunshine days - Islip, NY

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.2 days).

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Average UV index
Islip, NY

Average UV index - Islip, NY

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March and December (UV index 2).

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Average visibility
Islip, NY

Average visibility - Islip, NY

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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