Islip
New York, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Islip, NY

January, like December, in Islip, New York, is a wintry winter month, with average temperature fluctuating between 30°F (-1.1°C) and 37.9°F (3.3°C). January is the coldest month, 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 »

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

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

April is a fresh spring month in Islip, New York, with average temperature varying between 45.1°F (7.3°C) and 52.9°F (11.6°C). In April, the average high-temperature slightly increases, from a frosty 44.2°F (6.8°C) in March, to a fresh 52.9°F (11.6°C). Weather in April »

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

The first month of the summer, June, is an agreeable month in Islip, New York, 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 »

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

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

The first month of the autumn, September, is still a pleasant month in Islip, New York, 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 a pleasant 72.1°F (22.3°C). Weather in September »

October, the same as September, is another comfortable autumn month in Islip, New York, with average temperature fluctuating between 62.4°F (16.9°C) and 55.8°F (13.2°C). In October, the average high-temperature drops, from a pleasant 72.1°F (22.3°C) in September, to a comfortable 62.4°F (16.9°C). Weather in October »

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

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

What is the coldest month in Islip?

January is the coldest month, 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, in Islip, New York, there are 153.2 rainfall days, and 34.45" (875mm) of precipitation is accumulated.

What is the driest month in Islip?

January is the month with the least rainfall. Rain falls for 7.6 days and accumulates 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, in Islip, New York, there are 13 snowfall days, and 5.87" (149mm) of snow is accumulated.

When is the lowest UV index in Islip?

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

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?

The month with the least sunshine in Islip, New York, is February, with an average of 4.8h of sunshine.

What is the snowiest month in Islip?

March is the month with the most snowfall in Islip, New York. Snow falls for 2.6 days and accumulates 1.97" (50mm) of snow.

When it does not snow in Islip?

April through September are months without snowfall.

What is the most humid month in Islip?

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

When are the longest days in Islip?

June has the longest days of the year in Islip, with an average of 15.1h of daylight.

What are the months with 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, New York.

What is the wettest 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?

July has the most sunshine of the year in Islip, New York, with an average of 10.8h of sunshine.

When is the ocean warmest in Islip?

The month with the warmest seawater in Islip 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?

With an average of 9.3h of daylight, December has the shortest days of the year in Islip, New York.
Average rainfall - 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).

Average snowfall - 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).

Average sea temperature - Islip, NY

The best month for swimming (with the highest average sea temperature) is August (23.3°C).
The coldest month (with the lowest average sea temperature) is February (4.3°C).

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).

Average UV index - Islip, NY