September weather forecast
Great River, NY

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Weather in September

The first month of the autumn, September, is also an agreeable month in Great River, New York, with an average temperature varying between 65.3°F (18.5°C) and 72.1°F (22.3°C).

Temperature

The transition into September involves a small decrease in the average high-temperature, dipping slightly from a warm 78.1°F (25.6°C) in August to an agreeable 72.1°F (22.3°C). Great River notes a steady average temperature of 65.3°F (18.5°C) during the nights of September.

Humidity

The average relative humidity in September is 74%.

Rainfall

In September, the rain falls for 12.8 days. Throughout September, 2.48" (63mm) of precipitation is accumulated. Throughout the year, there are 155.3 rainfall days, and 34.84" (885mm) of precipitation is accumulated.

Snowfall

April, June through September and November are months without snowfall.

Ocean temperature

In Great River, the average seawater temperature in September is 69.6°F (20.9°C).
Note: The majority find it unenjoyable to swim in 69.6°F (20.9°C). Breathing becomes tougher as the water temperature descends under 69.8°F (21°C).

Daylight

In September, the average length of the day is 12h and 27min.
On the first day of the month, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:35 pm EDT.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In Great River, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a regular UV index of 5 translates into these guidelines:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Stay sun-safe with clothing that is both closely woven and worn loosely.
Updated: Jul 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The average high-temperature, in September, in Great River, is 72.1°F (22.3°C), while the average low-temperature is 65.3°F (18.5°C).

What is the average humidity in September?

The average relative humidity in September is 74%.

How much does it rain in September?

In Great River, in September, it is raining for 12.8 days, with typically 2.48" (63mm) of accumulated precipitation.

When it does not snow in Great River?

In Great River, snow does not fall in April, June through September and November.

Does it snow in September?

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

What is the ocean temperature in September in Great River?

In September, the average ocean temperature is 69.6°F (20.9°C). For most, swimming in 69.6°F (20.9°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does Great River have in September?

In September, the average day length is 12h and 27min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:35 pm EDT.

How many hours of sunshine does Great River have in September?

In September, the average sunshine duration is 9.2h.

What is the UV index reading in September?

In Great River, the average daily maximum UV index in September is 5. 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
Great River, NY

Average temperature in September - Great River, NY
  • Average high temperature in September: 72.1°F

The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in September: 65.3°F

The month with the highest average low temperature is August (71.8°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).

Average pressure in September
Great River, NY

Average pressure in September - Great River, NY
  • Average pressure in September: 30.05"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
Great River, NY

Average wind speed in September - Great River, NY
  • Average wind speed in September: 10.4mph

The windiest month (with the highest average wind speed) is January (13.8mph).
The calmest months (with the lowest average wind speed) are July and August (9mph).

Average humidity in September
Great River, NY

Average humidity in September - Great River, NY
  • Average humidity in September: 74%

The months with the highest relative humidity are May and June (78%).
The month with the lowest relative humidity is November (71%).

Average rainfall in September
Great River, NY

Average rainfall in September - Great River, NY
  • Average rainfall in September: 2.48"

The wettest month (with the highest rainfall) is December (3.74").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in September
Great River, NY

Average rainfall days in September - Great River, NY
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in September
Great River, NY

Average snowfall in September - Great River, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, June, July, August, September and November (0").

Average snowfall days in September
Great River, NY

Average snowfall days in September - Great River, NY
  • Average snowfall days in September: 0 days

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

Average sea temperature in September
Great River, NY

Average sea temperature in September - Great River, NY
  • Average sea temperature in September: 69.6°F

The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

Average daylight in September /
Average sunshine in September
Great River, NY

Average daylight in September / Average sunshine in September - Great River, NY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in September
Great River, NY

Average sunshine days in September - Great River, NY
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is July (11.3 days).

Average UV index in September
Great River, NY

Average UV index in September - Great River, NY
  • Average UV index in September: 5

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 and December (UV index 2).

Average cloud cover in September
Great River, NY

Average cloud cover in September - Great River, NY
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
Great River, NY

Average visibility in September - Great River, NY
  • Average visibility in September: 6mi

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

Great River, New York, USA

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