September weather forecast
Mastic, NY

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Weather in September

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

Temperature

A minor decrease in the average high-temperature is observed during September, shifting from a moderately hot 77.5°F (25.3°C) in August to a pleasant 71.4°F (21.9°C). The nighttime temperature demonstrates a marginal decline, averaging at a refreshing 65.3°F (18.5°C) during September.

Humidity

In September, the average relative humidity is 75%.

Rainfall

The months with the least rainfall are January, February and September Rain falls for 12.4 days and accumulates 2.01" (51mm) of rain.

Snowfall

In Mastic, snow does not fall in May through October.

Daylight

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

Sunshine

The average sunshine in September in Mastic is 9.1h.

UV index

In Mastic, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

The high-temperature, in September, in Mastic, records 71.4°F (21.9°C), while the low-temperature is 65.3°F (18.5°C).

What is the average humidity in September?

In Mastic, the average relative humidity in September is 75%.

What is the driest month?

January, February and September are months with the least rain 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 Mastic, in September, it is raining for 12.4 days, with typically 2.01" (51mm) of accumulated precipitation.

When it does not snow?

May through October are months without snowfall.

What is the average length of the day in September?

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

What time are sunrise and sunset in September?

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, sunrise is at 6:47 am and sunset at 6:34 pm EDT.

How many hours of sunshine does Mastic have in September?

In September, the average sunshine duration is 9.1h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability 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
Mastic, NY

Average temperature in September - Mastic, 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).

Average pressure in September
Mastic, NY

Average pressure in September - Mastic, 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
Mastic, NY

Average wind speed in September - Mastic, 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).

Average humidity in September
Mastic, NY

Average humidity in September - Mastic, 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%).

Average rainfall in September
Mastic, NY

Average rainfall in September - Mastic, 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").

Average rainfall days in September
Mastic, NY

Average rainfall days in September - Mastic, 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).

Average snowfall in September
Mastic, NY

Average snowfall in September - Mastic, 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").

Average snowfall days in September
Mastic, NY

Average snowfall days in September - Mastic, 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).

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

Average daylight in September / Average sunshine in September - Mastic, 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).

Average sunshine days in September
Mastic, NY

Average sunshine days in September - Mastic, 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).

Average UV index in September
Mastic, NY

Average UV index in September - Mastic, 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
Mastic, NY

Average cloud cover in September - Mastic, 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).

Average visibility in September
Mastic, NY

Average visibility in September - Mastic, 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).

Mastic, New York, USA

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