September weather forecast and climate
Commack, NY

September, the first month of the autumn, in Commack, is also an agreeable month, with average temperature varying between 64.8°F (18.2°C) and 72.3°F (22.4°C).

Temperature

In September, the average high-temperature marginally drops, from a warm 78.6°F (25.9°C) in August, to an agreeable 72.3°F (22.4°C). The average low-temperature, in Commack, is 64.8°F (18.2°C).

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Commack, it is raining for 13.5 days, with typically 2.64" (67mm) of accumulated precipitation. In Commack, New York, during the entire year, the rain falls for 155.9 days and collects up to 35.94" (913mm) of precipitation.

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

The average daily maximum UV index in Commack is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Commack?

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

What is the average humidity in September in Commack?

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

How much does it rain in Commack in September?

In Commack, in September, it is raining for 13.5 days, with typically 2.64" (67mm) of accumulated precipitation.

When it does not snow in Commack?

In Commack snow does not fall in April through October.

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

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

How long on average sun shines in September in Commack?

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

What is the UV index reading in September in Commack?

In September, the average daily maximum UV index in Commack, New York, is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Commack, NY
  • Average high temperature in September: 22.4°C

The warmest month (with the highest average high temperature) is July (26.3°C).
The month with the lowest average high temperature is January (3.1°C).

  • Average low temperature in September: 18.2°C

The month with the highest average low temperature is August (22°C).
The coldest month (with the lowest average low temperature) is January (-1.7°C).

Average pressure in September - Commack, NY
  • Average pressure in September: 1017.6mbar

The month with the highest atmospheric pressure is November (1019.1mbar).
The month with the lowest atmospheric pressure is June (1013.6mbar).

Average wind speed in September - Commack, NY
  • Average wind speed in September: 15.5km/h

The windiest month (with the highest average wind speed) is January (20.6km/h).
The calmest month (with the lowest average wind speed) is July (13.3km/h).

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: 67mm

The wettest month (with the highest rainfall) is July (100mm).
The driest month (with the least rainfall) is January (56mm).

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: 0mm

The month with the highest snowfall is March (47mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

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: 10km

Months with the highest visibility are June, July, August, September, October and November (10km).
Months with the lowest visibility are January, February, March, April, May and December (9km).