September weather forecast
Port Jefferson Station, NY

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Weather in September

September, the first month of the autumn in Port Jefferson Station, is also an agreeable month, with temperature in the range of an average low of 64.8°F (18.2°C) and an average high of 72.3°F (22.4°C).

Temperature

The move into September indicates a slight reduction in the average high-temperature, down from August's moderately hot 78.4°F (25.8°C) to an agreeable 72.3°F (22.4°C). Throughout September, Port Jefferson Station records a steady low-temperature average of 64.8°F (18.2°C), a minor decrease from its daytime counterpart.

Humidity

In Port Jefferson Station, the average relative humidity in September is 74%.

Rainfall

In Port Jefferson Station, during September, the rain falls for 12.6 days and regularly aggregates up to 2.4" (61mm) of precipitation. In Port Jefferson Station, New York, during the entire year, the rain falls for 146.8 days and collects up to 33.78" (858mm) of precipitation.

Snowfall

April through September are months without snowfall in Port Jefferson Station.

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of September, sunrise is at 6:19 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:35 pm EDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Updated: Jun 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature in Port Jefferson Station?

In Port Jefferson Station, 72.3°F (22.4°C) is the average high-temperature and 64.8°F (18.2°C) is the average low-temperature during September.

What is the average humidity in September?

In September, the average relative humidity is 74%.

How much does it rain in September?

In Port Jefferson Station, New York, in September, during 12.6 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

When it does not snow?

In Port Jefferson Station, snow does not fall in April through September.

Does it snow in September?

In Port Jefferson Station, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Port Jefferson Station have in September?

The average day length in September is 12h and 27min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:19 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:35 pm EDT.

How many hours of sunshine does Port Jefferson Station have in September?

The average sunshine duration in September in Port Jefferson Station is 8.9h.

How high is the UV index in September?

In Port Jefferson Station, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk 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
Port Jefferson Station, NY

Average temperature in September - Port Jefferson Station, NY
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (37.6°F).

  • Average low temperature in September: 64.8°F

The months with the highest average low temperature are July and August (71.1°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).

Average pressure in September
Port Jefferson Station, NY

Average pressure in September - Port Jefferson Station, 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).

Average wind speed in September
Port Jefferson Station, NY

Average wind speed in September - Port Jefferson Station, NY
  • Average wind speed in September: 9.8mph

The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).

Average humidity in September
Port Jefferson Station, NY

Average humidity in September - Port Jefferson Station, NY
  • Average humidity in September: 74%

The months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).

Average rainfall in September
Port Jefferson Station, NY

Average rainfall in September - Port Jefferson Station, NY
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in September
Port Jefferson Station, NY

Average rainfall days in September - Port Jefferson Station, NY
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (6.8 days).

Average snowfall in September
Port Jefferson Station, NY

Average snowfall in September - Port Jefferson Station, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, May, June, July, August and September (0").

Average snowfall days in September
Port Jefferson Station, NY

Average snowfall days in September - Port Jefferson Station, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Port Jefferson Station, NY

Average daylight in September / Average sunshine in September - Port Jefferson Station, NY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in September
Port Jefferson Station, NY

Average sunshine days in September - Port Jefferson Station, NY
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (13 days).

Average UV index in September
Port Jefferson Station, NY

Average UV index in September - Port Jefferson Station, 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, November and December (UV index 2).

Average cloud cover in September
Port Jefferson Station, NY

Average cloud cover in September - Port Jefferson Station, NY
  • Average cloud cover in September: 33

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in September
Port Jefferson Station, NY

Average visibility in September - Port Jefferson Station, 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).

Port Jefferson Station, New York, USA

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