September weather forecast
South Salem, NY

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Weather in September

The first month of the autumn, September, is also an agreeable month in South Salem, New York, with temperature in the range of an average low of 56.5°F (13.6°C) and an average high of 73°F (22.8°C).

Temperature

September signifies a gentle decline in South Salem's average high-temperature, easing from a warm 80.2°F (26.8°C) in August to a pleasant 73°F (22.8°C). South Salem's nighttime temperature in September drops to an average of 56.5°F (13.6°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In South Salem, during September, the rain falls for 9.7 days and regularly aggregates up to 0.67" (17mm) of precipitation. In South Salem, during the entire year, the rain falls for 123.7 days and collects up to 11.65" (296mm) of precipitation.

Snowfall

In South Salem, snow does not fall in May through September.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:37 pm EDT.

Sunshine

In September, the average sunshine is 8.6h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A daily maximum UV index of 4 in September translates into the following instructions:
Prioritize safety - Recommendations to avert sunburn are shared. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In September, in South Salem, the average high-temperature is 73°F (22.8°C), and the average low-temperature is 56.5°F (13.6°C). In July, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is calculated to be 87.8°F (31°C).

What is the average humidity in September in South Salem?

In September, the average relative humidity is 78%.

How many days does it rain in September in South Salem?

In South Salem, during September, the rain falls for 9.7 days and regularly aggregates up to 0.67" (17mm) of precipitation.

When it does not snow?

May through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

The average day length in September is 12h and 28min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:21 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:37 pm EDT.

How many hours of sunshine does South Salem have in September?

The average sunshine duration in September is 8.6h.

How high is the UV index in September?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health 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
South Salem, NY

Average temperature in September - South Salem, NY
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

Average pressure in September
South Salem, NY

Average pressure in September - South Salem, NY
  • Average pressure in September: 30.06"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
South Salem, NY

Average wind speed in September - South Salem, NY
  • Average wind speed in September: 5.9mph

The windiest months (with the highest average wind speed) are January and March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in September
South Salem, NY

Average humidity in September - South Salem, NY
  • Average humidity in September: 78%

The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (72%).

Average rainfall in September
South Salem, NY

Average rainfall in September - South Salem, NY
  • Average rainfall in September: 0.67"

The wettest month (with the highest rainfall) is July (1.57").
The driest months (with the least rainfall) are January and February (0.55").

Average rainfall days in September
South Salem, NY

Average rainfall days in September - South Salem, NY
  • Average rainfall days in September: 9.7 days

The month with the highest number of rainy days is July (14.4 days).
The month with the least rainy days is January (5.5 days).

Average snowfall in September
South Salem, NY

Average snowfall in September - South Salem, NY
  • Average snowfall in September: 0"

The months with the highest snowfall are January and February (0.75").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
South Salem, NY

Average snowfall days in September - South Salem, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
South Salem, NY

Average daylight in September / Average sunshine in September - South Salem, 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: 8h and 4min

The months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in September
South Salem, NY

Average sunshine days in September - South Salem, NY
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is January (22.5 days).
The month with the least sunshine days is June (13.3 days).

Average UV index in September
South Salem, NY

Average UV index in September - South Salem, NY
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
South Salem, NY

Average cloud cover in September - South Salem, NY
  • Average cloud cover in September: 37

The months with the most cloud cover are February, March and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 33).

Average visibility in September
South Salem, NY

Average visibility in September - South Salem, NY
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, July, August, September, October, November and December (6mi).
The months with the lowest visibility are May and June (5mi).

South Salem, New York, USA

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