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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in Islip, New York, is another cold winter month, with an average temperature varying between 37.9°F (3.3°C) and 30°F (-1.1°C). January, marked by an average high-temperature of 37.9°F (3.3°C) and a low-temperature of 30°F (-1.1°C), is the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is also an icy month in Islip, New York, with an average temperature fluctuating between 31.1°F (-0.5°C) and 39.7°F (4.3°C). As Islip welcomes February, the average high-temperature is noted at a still icy 39.7°F (4.3°C), closely aligning with the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Islip, is a chilly month, with an average temperature fluctuating between 44.2°F (6.8°C) and 36.1°F (2.3°C). Islip transitions into March recording an average high-temperature of a chilly 44.2°F (6.8°C), closely aligning with the preceding month's temperature. Weather in March »
Weather in April
April in Islip, New York, is a fresh spring month, with an average temperature varying between 45.1°F (7.3°C) and 52.9°F (11.6°C). April's arrival is noted with a slight increase in the average high-temperature, moving from a frosty 44.2°F (6.8°C) in March to a cool 52.9°F (11.6°C). Weather in April »
Weather in May
May, the last month of the spring in Islip, is an enjoyable month, with temperature in the range of an average high of 62.2°F (16.8°C) and an average low of 54.5°F (12.5°C). The beginning of May signals a rise in the average high-temperature, moving from a fresh 52.9°F (11.6°C) in April to a refreshing 62.2°F (16.8°C). Weather in May »
Weather in June
June, the first month of the summer in Islip, is a pleasant 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). Islip's weather in June shows a rise in the average high-temperature, moving up from May's comfortable 62.2°F (16.8°C) 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 an average temperature varying between 71.8°F (22.1°C) and 79°F (26.1°C). July stands out as Islip's warmest month, with an average high-temperature of 79°F (26.1°C) and a low-temperature of 71.8°F (22.1°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Islip, New York, with an average temperature varying between 78.4°F (25.8°C) and 72°F (22.2°C). August welcomes an average high-temperature of a still warm 78.4°F (25.8°C), not much different from the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Islip, is still a pleasant month, with an average temperature ranging between min 65.3°F (18.5°C) and max 72.1°F (22.3°C). As September begins, there is a minor decrease in the average high-temperature, softly falling from a warm 78.4°F (25.8°C) in August to an agreeable 72.1°F (22.3°C). Weather in September »
Weather in October
October, like September, in Islip, New York, is another refreshing autumn month, with temperature in the range of an average high of 62.4°F (16.9°C) and an average low of 55.8°F (13.2°C). The move into October indicates a reduction in the average high-temperature, down from September's agreeable 72.1°F (22.3°C) to a refreshing 62.4°F (16.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Islip, is also a fresh month, with an average temperature varying between 44.2°F (6.8°C) and 52°F (11.1°C). The arrival of November corresponds with a shift in temperature, down 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 an average temperature varying between 43.9°F (6.6°C) and 36.9°F (2.7°C). The beginning of December brings a minor change in the average high-temperature, shifting from a fresh 52°F (11.1°C) in November to a chilly 43.9°F (6.6°C). Weather in December »
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Islip?
The month of January, characterized by an average high of 37.9°F (3.3°C) and a low of 30°F (-1.1°C), is recognized as the coldest.
What is the driest month in Islip?
The month with the least rainfall is January, when the rain falls for 7.6 days and typically collects 2.05" (52mm) of precipitation.
How much does it rain in Islip?
In Islip, New York, during the entire year, the rain falls for 153.2 days and collects up to 34.45" (875mm) of precipitation.
When does it snow in Islip?
January through March, October through December are months with snowfall.
How much does it snow in Islip?
Throughout the year, in Islip, there are 13 snowfall days, and 5.87" (149mm) of snow is accumulated.
What is the month with the lowest UV index in Islip?
The months with the lowest UV index in Islip are January through March and December, with an average maximum UV index of 2.
What is the month with the coldest ocean in Islip?
The month with the coldest seawater in Islip, New York, is February, 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, with an average of 4.8h of sunshine.
What is the snowiest month in Islip?
The month with the most snowfall in Islip is March, when snow falls for 2.6 days and typically aggregates up to 1.97" (50mm) of snow.
When is Daylight Saving Time (DST) in Islip?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Islip, New York, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
When it does not snow in Islip?
April through September are months without snowfall in Islip, New York.
What are the most humid months in Islip?
May and June, with an average relative humidity of 77%, are most humid months in Islip, New York.
When are the longest days in Islip?
With an average of 15h and 0min of daylight, June has the longest days of the year in Islip, New York.
What is the month with the highest UV index in Islip?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What are the warmest months in Islip?
July proves to be the warmest month in Islip, New York, recording an average peak temperature of 79°F (26.1°C) and a minimum temperature of 71.8°F (22.1°C).
What is the rainiest month in Islip?
The month with the most rainfall in Islip, New York, is July, when the rain falls for 17.9 days and typically aggregates up to 3.86" (98mm) of precipitation.
What month has the most sunshine in Islip?
The month with the most sunshine in Islip is July, with an average of 10.8h of sunshine.
What is the month with the warmest ocean in Islip?
With an average ocean temperature of 73.9°F (23.3°C), August is the month with the warmest seawater.
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?
December has the shortest days of the year, with an average of 9h and 18min of daylight.
Average temperature
Islip, NY
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (37.9°F).
The month with the highest average low temperature is August (72°F).
The coldest month (with the lowest average low temperature) is January (30°F).
Average pressure
Islip, NY
- Average pressure in January:
30.05"Hg - Average pressure in February:
30.02"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Islip, NY
- Average wind speed in January:
13.4mph - Average wind speed in February:
12.9mph - Average wind speed in March:
12.5mph - Average wind speed in April:
11.5mph - Average wind speed in May:
9.8mph - Average wind speed in June:
8.9mph
- Average wind speed in July:
8.6mph - Average wind speed in August:
8.8mph - Average wind speed in September:
10.1mph - Average wind speed in October:
11.9mph - Average wind speed in November:
12.6mph - Average wind speed in December:
12.9mph
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).
Average humidity
Islip, NY
The months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).
Average rainfall
Islip, NY
- Average rainfall in January:
2.05" - Average rainfall in February:
2.17" - Average rainfall in March:
2.56" - Average rainfall in April:
2.83" - Average rainfall in May:
2.95" - Average rainfall in June:
2.91"
- Average rainfall in July:
3.86" - Average rainfall in August:
3.35" - Average rainfall in September:
2.56" - Average rainfall in October:
3.23" - Average rainfall in November:
2.4" - Average rainfall in December:
3.58"
The wettest month (with the highest rainfall) is July (3.86").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days
Islip, NY
- Average rainfall days in January:
7.6 days - Average rainfall days in February:
8.5 days - Average rainfall days in March:
10.8 days - Average rainfall days in April:
13.7 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
15.9 days
- Average rainfall days in July:
17.9 days - Average rainfall days in August:
16.3 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
13.1 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
11.6 days
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
The month with the highest snowfall is March (1.97").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days
Islip, NY
- Average snowfall days in January:
3.8 days - Average snowfall days in February:
4.2 days - Average snowfall days in March:
2.6 days - Average snowfall days in April:
0.1 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
0.5 days - Average snowfall days in December:
1.7 days
The month with the highest number of snowfall days is February (4.2 days).
The 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 (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).
Average daylight / Average sunshine
Islip, NY
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 4min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 5min - Average sunshine in August:
10h and 4min - Average sunshine in September:
9h and 1min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days
Islip, NY
- Average sunshine days in January:
19.4 days - Average sunshine days in February:
15.5 days - Average sunshine days in March:
17.3 days - Average sunshine days in April:
14.9 days - Average sunshine days in May:
13.9 days - Average sunshine days in June:
12.7 days
- Average sunshine days in July:
11.2 days - Average sunshine days in August:
12.5 days - Average sunshine days in September:
14.7 days - Average sunshine days in October:
16.8 days - Average sunshine days in November:
19.7 days - Average sunshine days in December:
17.4 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.2 days).
Average UV index
Islip, NY
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover
Islip, NY
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility
Islip, NY
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Islip, New York, USA
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