September weather forecast
Mastic, NY

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Weather in September

The first month of the autumn, September, is still a pleasant month in Mastic, New York, with temperature in the range of an average low of 65.3°F (18.5°C) and an average high of 71.4°F (21.9°C).

Temperature

September brings a slight decrease in the average high-temperature, shifting from a moderately hot 77.5°F (25.3°C) in August to a pleasant 71.4°F (21.9°C). With a barely noticeable fluctuation in temperature, Mastic reaches an average low of 65.3°F (18.5°C) during the September nights.

Humidity

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

Rainfall

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.

Snowfall

In Mastic, New York, 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 in Mastic, 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

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

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: A daily maximum UV index of 5 in September translates into the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
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Frequently asked questions

What is the average September temperature in Mastic?

The average high-temperature and low-temperature during September are 71.4°F (21.9°C) and 65.3°F (18.5°C) respectively.

What is the average humidity in September in Mastic?

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

What is the driest month in Mastic?

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

How much does it rain in Mastic in September?

In Mastic, during September, the rain falls for 12.4 days and regularly aggregates up to 2.01" (51mm) of precipitation.

When it does not snow in Mastic?

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

How many hours of daylight does Mastic have in September?

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

When are sunrise and sunset in September in Mastic?

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

How long on average sun shines in September in Mastic?

The average sunshine duration in September in Mastic, New York, is 9.1h.

How high is the UV index in September in Mastic?

In Mastic, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health risk 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
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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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).

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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).

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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).

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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).

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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).

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Mastic, New York, USA

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