September weather forecast
Brookhaven, NY

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Weather in September

The first month of the autumn, September, is also an agreeable month in Brookhaven, New York, with an average temperature varying between 71.4°F (21.9°C) and 65.3°F (18.5°C).

Temperature

During the shift to September, Brookhaven records a mild decrease in average high-temperature, moving from a moderately hot 77.5°F (25.3°C) in August to an agreeable 71.4°F (21.9°C). Brookhaven indicates a consistently low-temperature of 65.3°F (18.5°C) during the nights of September.

Humidity

In Brookhaven, New York, the average relative humidity in September is 75%.

Rainfall

January, February and September are months with the least rain in Brookhaven when the rain falls for 12.4 days and typically aggregates up to 2.01" (51mm) of rain.

Snowfall

May through October are months without snowfall.

Daylight

In Brookhaven, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:19 am and sunset at 7:23 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:34 pm EDT.

Sunshine

In September, the average sunshine is 9.1h.

UV index

In Brookhaven, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: During September, 5 as the daily maximum UV index converts into the following advice:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
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Frequently asked questions

What is the usual temperature for Brookhaven in September?

The high-temperature in Brookhaven, New York, during September is 71.4°F (21.9°C) and the low-temperature is 65.3°F (18.5°C).

What is the average humidity in September in Brookhaven?

In Brookhaven, New York, the average relative humidity in September is 75%.

What is the driest month in Brookhaven?

January, February and September are months with the least rain in Brookhaven when the rain falls for 12.4 days and typically aggregates up to 2.01" (51mm) of rain.

How many days does it rain in September in Brookhaven?

In Brookhaven, New York, in September, it is raining for 12.4 days, with typically 2.01" (51mm) of accumulated precipitation.

When it does not snow in Brookhaven?

In Brookhaven, New York, snow does not fall in May through October.

What is the average length of the day in September in Brookhaven?

In Brookhaven, New York, the average day length in September is 12h and 27min.

When are sunrise and sunset in September in Brookhaven?

In September, on the first day of the month, sunrise is at 6:19 am and sunset at 7:23 pm. On the last day of the month, in Brookhaven, New York, sunrise is at 6:47 am and sunset at 6:34 pm EDT.

How many hours of sunshine does Brookhaven have in September?

The average sunshine duration in September is 9.1h.

What is the UV index reading in September in Brookhaven?

In September, the average daily maximum UV index in Brookhaven is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.
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
Brookhaven, NY

Average temperature in September - Brookhaven, NY
  • Average high temperature in September: 71.4°F

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in September: 65.3°F

The months with the highest average low temperature are July and August (71.4°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

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Average pressure in September
Brookhaven, NY

Average pressure in September - Brookhaven, 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
Brookhaven, NY

Average wind speed in September - Brookhaven, NY
  • Average wind speed in September: 11.1mph

The windiest month (with the highest average wind speed) is January (14.5mph).
The calmest months (with the lowest average wind speed) are July and August (9.6mph).

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Average humidity in September
Brookhaven, NY

Average humidity in September - Brookhaven, NY
  • Average humidity in September: 75%

The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is November (71%).

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Average rainfall in September
Brookhaven, NY

Average rainfall in September - Brookhaven, NY
  • Average rainfall in September: 2.01"

The wettest month (with the highest rainfall) is December (3.31").
The driest months (with the least rainfall) are January, February and September (2.01").

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Average rainfall days in September
Brookhaven, NY

Average rainfall days in September - Brookhaven, NY
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (9 days).

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Average snowfall in September
Brookhaven, NY

Average snowfall in September - Brookhaven, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Brookhaven, NY

Average snowfall days in September - Brookhaven, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Brookhaven, NY

Average daylight in September / Average sunshine in September - Brookhaven, 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: 9h and 1min

The months with the most sunshine are July and August (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
Brookhaven, NY

Average sunshine days in September - Brookhaven, NY
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is February (12.8 days).

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Average UV index in September
Brookhaven, NY

Average UV index in September - Brookhaven, 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
Brookhaven, NY

Average cloud cover in September - Brookhaven, NY
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in September
Brookhaven, NY

Average visibility in September - Brookhaven, 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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Brookhaven, New York, USA

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