September weather forecast and climate
Hewlett, NY

September, the first month of the autumn, in Hewlett, is also an agreeable month, with average temperature varying between 64.2°F (17.9°C) and 73.2°F (22.9°C).

Temperature

In Hewlett, the average high-temperature slightly decreases, from a moderately hot 79.9°F (26.6°C) in August, to a pleasant 73.2°F (22.9°C). In Hewlett, the average low-temperature is 64.2°F (17.9°C).

Humidity

The average relative humidity in Hewlett is 74%.

Rainfall

In Hewlett, in September, during 12.4 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In Hewlett, New York, during the entire year, the rain falls for 135.3 days and collects up to 18.62" (473mm) of precipitation.

Snowfall

In Hewlett snow does not fall in April through September.

Daylight

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

Sunshine

In September, the average sunshine is 9.1h.

UV index

In September, the average daily maximum UV index in Hewlett is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. 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 Hewlett?

In September, in Hewlett, New York, the average high-temperature is 73.2°F (22.9°C), and the average low-temperature is 64.2°F (17.9°C).

What is the average humidity in September in Hewlett?

The average relative humidity in September in Hewlett, New York, is 74%.

How many days does it rain in September in Hewlett?

In Hewlett, New York, during September, the rain falls for 12.4 days and regularly aggregates up to 1.38" (35mm) of precipitation.

Does it snow in Hewlett in September?

In Hewlett, New York, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Hewlett?

April through September are months without snowfall in Hewlett.

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

The average length of the day in September in Hewlett, New York, is 12.4h.

How many hours of sunshine does Hewlett have in September?

In September, the average sunshine is 9.1h.

How high is the UV index in September in Hewlett?

In September, the average daily maximum UV index in Hewlett, New York, is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in September - Hewlett, NY
  • Average high temperature in September: 22.9°C

The warmest month (with the highest average high temperature) is July (27°C).
The month with the lowest average high temperature is January (2.8°C).

  • Average low temperature in September: 17.9°C

The month with the highest average low temperature is August (21.7°C).
The coldest month (with the lowest average low temperature) is January (-2.1°C).

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

The month with the highest atmospheric pressure is November (1019.3mbar).
The month with the lowest atmospheric pressure is June (1013.6mbar).

Average wind speed in September - Hewlett, NY
  • Average wind speed in September: 14.6km/h

The windiest month (with the highest average wind speed) is January (19.9km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).

Average humidity in September - Hewlett, 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 (72%).

Average rainfall in September - Hewlett, NY
  • Average rainfall in September: 35mm

The wettest months (with the highest rainfall) are July and August (59mm).
The driest month (with the least rainfall) is January (23mm).

Average rainfall days in September - Hewlett, NY
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in September - Hewlett, NY
  • Average snowfall in September: 0mm

The month with the highest snowfall is March (26mm).
Months with the least snowfall are April, May, June, July, August and September (0mm).

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

The month with the highest number of snowfall days is January (4.6 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Hewlett, 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 - Hewlett, NY
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is July (13.6 days).

Average UV index in September - Hewlett, 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, November and December (UV index 2).

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

Months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September - Hewlett, NY
  • Average visibility in September: 10km

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