September weather forecast and climate
Commack, NY

The first month of the autumn, September, is also an agreeable month in Commack, New York, 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

In Commack, the average high-temperature slightly decreases, from a moderately hot 78.6°F (25.9°C) in August, to a pleasant 72.3°F (22.4°C). In September, the average low-temperature is 64.8°F (18.2°C).

Humidity

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

Rainfall

In Commack, during September, the rain falls for 13.5 days and regularly aggregates up to 2.64" (67mm) of precipitation. Throughout the year, there are 155.9 rainfall days, and 35.94" (913mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In September, the average length of the day in Commack is 12.4h.

Sunshine

In Commack, the average sunshine is 9.1h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Commack?

In Commack, New York, in September, the average high-temperature is 72.3°F (22.4°C), and the average low-temperature is 64.8°F (18.2°C).

What is the average humidity in September in Commack?

The average relative humidity in September in Commack is 74%.

How many days does it rain in September in Commack?

In Commack, during September, the rain falls for 13.5 days and regularly aggregates up to 2.64" (67mm) of precipitation.

When it does not snow in Commack?

In Commack, New York, snow does not fall in April through October.

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

In September, the average length of the day in Commack, New York, is 12.4h.

How many hours of sunshine does Commack have in September?

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

How high is the UV index in September in Commack?

In September, the average daily maximum UV index in Commack, New York, is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Commack, NY
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (37.6°F).

  • Average low temperature in September: 64.8°F

The month with the highest average low temperature is August (71.6°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).

Average pressure in September - Commack, NY
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

Average wind speed in September - Commack, NY
  • Average wind speed in September: 9.6mph

The windiest month (with the highest average wind speed) is January (12.8mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).

Average humidity in September - Commack, 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 - Commack, NY
  • Average rainfall in September: 2.64"

The wettest month (with the highest rainfall) is July (3.94").
The driest month (with the least rainfall) is January (2.2").

Average rainfall days in September - Commack, NY
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is January (7.8 days).

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

The month with the highest snowfall is March (1.85").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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

The month with the highest number of snowfall days is February (4.8 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Commack, NY
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 9.1h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.8h).

Average sunshine days in September - Commack, NY
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in September - Commack, NY
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March and December (UV index 2).

Average cloud cover in September - Commack, 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 28).

Average visibility in September - Commack, NY
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).