September weather forecast
Greenwich, NY

Share

Weather in September

September, the first month of the autumn in Greenwich, is also an agreeable month, with an average temperature fluctuating between 51.1°F (10.6°C) and 71.6°F (22°C).

Temperature

Greenwich experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a moderately hot 78.6°F (25.9°C) in August to a pleasant 71.6°F (22°C). In Greenwich, the average temperature during the nights of September drops to a fresh 51.1°F (10.6°C).

Humidity

The average relative humidity in September in Greenwich is 78%.

Rainfall

In Greenwich, in September, during 10.1 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. Throughout the year, in Greenwich, there are 123.3 rainfall days, and 18.62" (473mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Greenwich.

Daylight

In September, the average length of the day in Greenwich is 12h and 29min.
On the first day of the month, sunrise is at 6:19 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:36 pm EDT.

Sunshine

The average sunshine in September is 9h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
[Resources]

Frequently asked questions

What is the usual temperature for Greenwich in September?

In Greenwich, in September, the average high-temperature is 71.6°F (22°C), and the average low-temperature is 51.1°F (10.6°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in July is appraised at 86°F (30°C).

What is the average humidity in September in Greenwich?

In September, the average relative humidity in Greenwich is 78%.

How much does it rain in Greenwich in September?

In Greenwich, in September, it is raining for 10.1 days, with typically 1.38" (35mm) of accumulated precipitation.

When it does not snow in Greenwich?

June through September are months without snowfall in Greenwich, New York.

Does it snow in Greenwich in September?

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

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

In September, the average day length is 12h and 29min.

When is the sunrise / sunset in September in Greenwich?

On the first day of September in Greenwich, sunrise is at 6:19 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:36 pm EDT.

How many hours of sunshine does Greenwich have in September?

The average sunshine duration in September in Greenwich is 9h.

What is the UV index reading in September in Greenwich?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
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
Greenwich, NY

Average temperature in September - Greenwich, NY
  • Average high temperature in September: 71.6°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in September: 51.1°F

The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).

[Resources]

Average pressure in September
Greenwich, NY

Average pressure in September - Greenwich, 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 (29.92"Hg).

[Resources]

Average wind speed in September
Greenwich, NY

Average wind speed in September - Greenwich, NY
  • Average wind speed in September: 5.5mph

The windiest months (with the highest average wind speed) are January and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

[Resources]

Average humidity in September
Greenwich, NY

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

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (73%).

[Resources]

Average rainfall in September
Greenwich, NY

Average rainfall in September - Greenwich, NY
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is July (2.01").
The driest month (with the least rainfall) is March (1.1").

[Resources]

Average rainfall days in September
Greenwich, NY

Average rainfall days in September - Greenwich, NY
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is June (14.1 days).
The month with the least rainy days is January (4 days).

[Resources]

Average snowfall in September
Greenwich, NY

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

The month with the highest snowfall is February (5").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in September
Greenwich, NY

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

The month with the highest number of snowfall days is February (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

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

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

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).

[Resources]

Average sunshine days in September
Greenwich, NY

Average sunshine days in September - Greenwich, NY
  • Average sunshine days in September: 18.2 days

The month with the most sunshine days is January (20.4 days).
The month with the least sunshine days is June (14.3 days).

[Resources]

Average UV index in September
Greenwich, NY

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

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

[Resources]

Average cloud cover in September
Greenwich, NY

Average cloud cover in September - Greenwich, NY
  • Average cloud cover in September: 34

The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 33).

[Resources]

Average visibility in September
Greenwich, NY

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

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

[Resources]

Greenwich, New York, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location