September weather forecast
Great Valley, NY

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Weather in September

The first month of the autumn, September, is still a pleasant month in Great Valley, New York, with an average temperature varying between 50.2°F (10.1°C) and 69.6°F (20.9°C).

Temperature

With the onset of September, Great Valley's climate undergoes a slight change as the average high-temperature moves from a warm 76.3°F (24.6°C) in August to a pleasant 69.6°F (20.9°C). In the month of September, the nighttime temperature dips to a steady average of 50.2°F (10.1°C).

Humidity

In September, the average relative humidity in Great Valley is 81%.

Rainfall

The month with the least rainfall in Great Valley is September, when the rain falls for 14.4 days and typically collects 1.69" (43mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of September, sunrise is at 6:40 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:57 pm EDT.

Sunshine

In September, the average sunshine is 8.4h.

UV index

In Great Valley, New York, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 3 during September leads to these instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.
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Frequently asked questions

What is the average September temperature in Great Valley?

The high-temperature, in September, in Great Valley, records 69.6°F (20.9°C), while the low-temperature is 50.2°F (10.1°C).

What is the average humidity in September in Great Valley?

In Great Valley, the average relative humidity in September is 81%.

What is the driest month in Great Valley?

September is the month with the least rainfall in Great Valley, New York. Rain falls for 14.4 days and accumulates 1.69" (43mm) of precipitation.

How much does it rain in Great Valley in September?

In Great Valley, New York, during September, the rain falls for 14.4 days and regularly aggregates up to 1.69" (43mm) of precipitation.

When it does not snow in Great Valley?

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

Does it snow in Great Valley in September?

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

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

In September, the average day length is 12h and 28min.

What time are sunrise and sunset in September in Great Valley?

On the first day of September, sunrise is at 6:40 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:57 pm EDT.

How long on average sun shines in September in Great Valley?

In Great Valley, New York, the average sunshine duration in September is 8.4h.

How high is the UV index in September in Great Valley?

In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health risk from 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
Great Valley, NY

Average temperature in September - Great Valley, NY
  • Average high temperature in September: 69.6°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (28°F).

  • Average low temperature in September: 50.2°F

The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).

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Average pressure in September
Great Valley, NY

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

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Great Valley, NY

Average wind speed in September - Great Valley, NY
  • Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

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Average humidity in September
Great Valley, NY

Average humidity in September - Great Valley, NY
  • Average humidity in September: 81%

The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (79%).

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Average rainfall in September
Great Valley, NY

Average rainfall in September - Great Valley, NY
  • Average rainfall in September: 1.69"

The wettest month (with the highest rainfall) is April (3.27").
The driest month (with the least rainfall) is September (1.69").

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Average rainfall days in September
Great Valley, NY

Average rainfall days in September - Great Valley, NY
  • Average rainfall days in September: 14.4 days

The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is January (6.7 days).

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Average snowfall in September
Great Valley, NY

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

The month with the highest snowfall is February (8.98").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Great Valley, NY

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

The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 2min

The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

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Average sunshine days in September
Great Valley, NY

Average sunshine days in September - Great Valley, NY
  • Average sunshine days in September: 13.3 days

The month with the most sunshine days is September (13.3 days).
The month with the least sunshine days is January (8.3 days).

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Average UV index in September
Great Valley, NY

Average UV index in September - Great Valley, NY
  • Average UV index in September: 3

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

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Average cloud cover in September
Great Valley, NY

Average cloud cover in September - Great Valley, NY
  • Average cloud cover in September: 42

The month with the most cloud cover is January (Cloud cover 79).
The months with the least cloud cover are July and August (Cloud cover 39).

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Average visibility in September
Great Valley, NY

Average visibility in September - Great Valley, NY
  • Average visibility in September: 5mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January and February (4mi).

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Great Valley, New York, USA

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