September weather forecast
Melville, NY

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Weather in September

The first month of the autumn, September, is still a pleasant month in Melville, New York, with temperature in the range of an average high of 72.5°F (22.5°C) and an average low of 65.5°F (18.6°C).

Temperature

With September's onset, the weather reveals a slight temperature decrease, transitioning from a warm 78.6°F (25.9°C) in August to an agreeable 72.5°F (22.5°C). Melville's September nights observe a minor shift from the daytime temperatures, resulting in an average dip to a refreshing 65.5°F (18.6°C).

Humidity

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

Rainfall

In Melville, New York, in September, during 12 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, in Melville, there are 128.1 rainfall days, and 12.56" (319mm) of precipitation is accumulated.

Snowfall

June through October are months without snowfall.

Daylight

In September, the average length of the day in Melville is 12h and 27min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:36 pm EDT.

Sunshine

In September, the average sunshine in Melville is 9.1h.

UV index

In September, the average daily maximum UV index in Melville, New York, is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, a regular UV index of 5 translates into these guidelines:
Be vigilant - Preventing sunburn is recommended. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Melville in September?

The high-temperature, in September, in Melville, records 72.5°F (22.5°C), while the low-temperature is 65.5°F (18.6°C).

What is the average humidity in September in Melville?

In Melville, New York, the average relative humidity in September is 74%.

How much does it rain in Melville in September?

In Melville, New York, during September, the rain falls for 12 days and regularly aggregates up to 0.79" (20mm) of precipitation.

When it does not snow in Melville?

June through October are months without snowfall in Melville, New York.

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

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

When are sunrise and sunset in September in Melville?

On the first day of September in Melville, New York, sunrise is at 6:21 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.

How many hours of sunshine does Melville have in September?

In September, the average sunshine duration is 9.1h.

How high is the UV index in September in Melville?

The average daily maximum UV index in September in Melville, New York, is 5. A UV Index estimate of 3 to 5 represents 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
Melville, NY

Average temperature in September - Melville, NY
  • Average high temperature in September: 72.5°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 (37.8°F).

  • Average low temperature in September: 65.5°F

The month with the highest average low temperature is August (71.8°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).

Average pressure in September
Melville, NY

Average pressure in September - Melville, 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
Melville, NY

Average wind speed in September - Melville, NY
  • Average wind speed in September: 10.1mph

The windiest month (with the highest average wind speed) is January (13.3mph).
The calmest month (with the lowest average wind speed) is July (8.7mph).

Average humidity in September
Melville, NY

Average humidity in September - Melville, NY
  • Average humidity in September: 74%

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

Average rainfall in September
Melville, NY

Average rainfall in September - Melville, NY
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is July (1.73").
The driest month (with the least rainfall) is February (0.59").

Average rainfall days in September
Melville, NY

Average rainfall days in September - Melville, NY
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is July (14.1 days).
The month with the least rainy days is January (5.9 days).

Average snowfall in September
Melville, NY

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

The month with the highest snowfall is March (0.35").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Melville, NY

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

The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Melville, 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 month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in September
Melville, NY

Average sunshine days in September - Melville, NY
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is June (14 days).

Average UV index in September
Melville, NY

Average UV index in September - Melville, 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).

Average cloud cover in September
Melville, NY

Average cloud cover in September - Melville, NY
  • Average cloud cover in September: 32

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 in September
Melville, NY

Average visibility in September - Melville, 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).

Melville, New York, USA

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