September weather forecast
Harriman, NY

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Weather in September

September, the first month of the autumn in Harriman, is still a warm month, with an average temperature varying between 54.9°F (12.7°C) and 74.1°F (23.4°C).

Temperature

Harriman's September weather features a light decline in high-temperatures, reducing from a warm 81.5°F (27.5°C) in August to a still moderately hot 74.1°F (23.4°C). Harriman, in the month of September, anticipates a consistent average low-temperature of 54.9°F (12.7°C).

Humidity

The average relative humidity in September is 78%.

Rainfall

In September, the rain falls for 12.1 days. Throughout September, 1.54" (39mm) of precipitation is accumulated. In Harriman, during the entire year, the rain falls for 141.2 days and collects up to 25" (635mm) of precipitation.

Snowfall

In Harriman, snow does not fall in June through September.

Daylight

In Harriman, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:23 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:39 pm EDT.

Sunshine

The average sunshine in September is 8.8h.

UV index

In Harriman, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: A maximum high daily UV index of 4 during September translates into the following directions:
Prioritize safety - Suggestions to prevent sun damage are offered. To protect against the Sun's most potent rays, avoid direct exposure around midday. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

In Harriman, in September, the average high-temperature is 74.1°F (23.4°C), and the average low-temperature is 54.9°F (12.7°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is calculated to be 86°F (30°C).

What is the average humidity in September?

The average relative humidity in September is 78%.

How much does it rain in September?

In Harriman, during September, the rain falls for 12.1 days and regularly aggregates up to 1.54" (39mm) of precipitation.

When it does not snow?

In Harriman, snow does not fall in June through September.

Does it snow in Harriman in September?

In Harriman, in September, it doesn't snow. In October, it regularly snows.

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

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

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:23 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:39 pm EDT.

How many hours of sunshine does Harriman have in September?

In Harriman, the average sunshine duration in September is 8.8h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's 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
Harriman, NY

Average temperature in September - Harriman, NY
  • Average high temperature in September: 74.1°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (33.3°F).

  • Average low temperature in September: 54.9°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in September
Harriman, NY

Average pressure in September - Harriman, NY
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Harriman, NY

Average wind speed in September - Harriman, NY
  • Average wind speed in September: 5mph

The windiest months (with the highest average wind speed) are January, February and March (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

Average humidity in September
Harriman, NY

Average humidity in September - Harriman, NY
  • Average humidity in September: 78%

The months with the highest relative humidity are February and December (81%).
The month with the lowest relative humidity is April (74%).

Average rainfall in September
Harriman, NY

Average rainfall in September - Harriman, NY
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is July (2.68").
The driest month (with the least rainfall) is January (1.46").

Average rainfall days in September
Harriman, NY

Average rainfall days in September - Harriman, NY
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (5.5 days).

Average snowfall in September
Harriman, NY

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

The month with the highest snowfall is February (4.29").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Harriman, NY

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

The month with the highest number of snowfall days is February (7.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Harriman, NY

Average daylight in September / Average sunshine in September - Harriman, 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 5min

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

Average sunshine days in September
Harriman, NY

Average sunshine days in September - Harriman, NY
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is January (21 days).
The month with the least sunshine days is June (11.8 days).

Average UV index in September
Harriman, NY

Average UV index in September - Harriman, NY
  • Average UV index in September: 4

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, November and December (UV index 2).

Average cloud cover in September
Harriman, NY

Average cloud cover in September - Harriman, NY
  • Average cloud cover in September: 38

The months with the most cloud cover are February and March (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 34).

Average visibility in September
Harriman, NY

Average visibility in September - Harriman, NY
  • Average visibility in September: 5mi

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

Harriman, New York, USA

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