September weather forecast
West Islip, NY

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Weather in September

The first month of the autumn, September, is also an agreeable month in West Islip, New York, with temperature in the range of an average high of 72.3°F (22.4°C) and an average low of 65.5°F (18.6°C).

Temperature

As September arrives, West Islip's weather displays a minor decrease in high-temperatures, transitioning from August's warm 78.4°F (25.8°C) to an agreeable 72.3°F (22.4°C). September witnesses a minor deviation from daytime peaks, with an average nighttime temperature of 65.5°F (18.6°C).

Humidity

In West Islip, the average relative humidity in September is 74%.

Rainfall

In West Islip, in September, it is raining for 13.8 days, with typically 2.56" (65mm) of accumulated precipitation. Throughout the year, in West Islip, New York, there are 157 rainfall days, and 35.98" (914mm) of precipitation is accumulated.

Snowfall

In West Islip, snow does not fall in May through September.

Daylight

In West Islip, the average length of the day in September is 12h and 27min.
On the first day of September in West Islip, sunrise is at 6:20 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:36 pm EDT.

Sunshine

In West Islip, the average sunshine in September is 9.1h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 5 suggests these recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
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Frequently asked questions

What is the usual temperature for West Islip in September?

West Islip in September has an average high-temperature of 72.3°F (22.4°C) and an average low-temperature of 65.5°F (18.6°C).

What is the average humidity in September in West Islip?

The average relative humidity in September is 74%.

How much does it rain in West Islip in September?

In West Islip, New York, during September, the rain falls for 13.8 days and regularly aggregates up to 2.56" (65mm) of precipitation.

When it does not snow in West Islip?

In West Islip, New York, snow does not fall in May through September.

Does it snow in West Islip in September?

In West Islip, New York, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in West Islip?

In September, the average day length is 12h and 27min.

What time are sunrise and sunset in September in West Islip?

In September, on the first day of the month, sunrise is at 6:20 am and sunset at 7:25 pm. On the last day of the month, in West Islip, New York, sunrise is at 6:49 am and sunset at 6:36 pm EDT.

How many hours of sunshine does West Islip have in September?

The average sunshine duration in September is 9.1h.

What is the UV index reading in September in West Islip?

In West Islip, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
West Islip, NY

Average temperature in September - West Islip, NY
  • Average high temperature in September: 72.3°F

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).

  • Average low temperature in September: 65.5°F

The months with the highest average low temperature are July and August (72°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).

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Average pressure in September
West Islip, NY

Average pressure in September - West Islip, NY
  • Average pressure in September: 30.05"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).

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Average wind speed in September
West Islip, NY

Average wind speed in September - West Islip, NY
  • Average wind speed in September: 10.3mph

The windiest month (with the highest average wind speed) is January (13.6mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).

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Average humidity in September
West Islip, NY

Average humidity in September - West Islip, NY
  • Average humidity in September: 74%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is November (71%).

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Average rainfall in September
West Islip, NY

Average rainfall in September - West Islip, NY
  • Average rainfall in September: 2.56"

The wettest month (with the highest rainfall) is July (3.98").
The driest month (with the least rainfall) is January (2.2").

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Average rainfall days in September
West Islip, NY

Average rainfall days in September - West Islip, NY
  • Average rainfall days in September: 13.8 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.1 days).

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Average snowfall in September
West Islip, NY

Average snowfall in September - West Islip, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.17").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
West Islip, NY

Average snowfall days in September - West Islip, NY
  • Average snowfall days in September: 0 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).

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Average daylight in September /
Average sunshine in September
West Islip, NY

Average daylight in September / Average sunshine in September - West Islip, NY
  • Average daylight in September: 12h and 3min

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 September: 9h and 1min

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).

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Average sunshine days in September
West Islip, NY

Average sunshine days in September - West Islip, NY
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is July (11.4 days).

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Average UV index in September
West Islip, NY

Average UV index in September - West Islip, NY
  • Average UV index in September: 5

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).

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Average cloud cover in September
West Islip, NY

Average cloud cover in September - West Islip, NY
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
West Islip, NY

Average visibility in September - West Islip, NY
  • Average visibility in September: 6mi

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).

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West Islip, New York, USA

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