September weather forecast
Derby, NY

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Weather in September

September, the first month of the autumn in Derby, is still a pleasant month, with an average temperature ranging between max 70.2°F (21.2°C) and min 54.7°F (12.6°C).

Temperature

September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a moderately hot 75.9°F (24.4°C) in August to an agreeable 70.2°F (21.2°C). During the nights in September, the temperature averages to a cool 54.7°F (12.6°C).

Humidity

August and September, with an average relative humidity of 78%, are the least humid months.

Rainfall

In Derby, New York, in September, during 14.2 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. In Derby, during the entire year, the rain falls for 160.5 days and collects up to 24.17" (614mm) of precipitation.

Snowfall

In Derby, New York, snow does not fall in June through September.

Daylight

In Derby, the average length of the day in September is 12h and 29min.
On the first day of September in Derby, sunrise is at 6:41 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:58 pm EDT.

Sunshine

In September, the average sunshine in Derby, New York, is 8.9h.

UV index

In September, the average daily maximum UV index in Derby is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
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Frequently asked questions

What is the usual temperature for Derby in September?

In September, in Derby, the average high-temperature is 70.2°F (21.2°C), and the average low-temperature is 54.7°F (12.6°C).

What is the least humid month in Derby?

The months with the lowest humidity are August and September, with an average relative humidity of 78%.

What is the average humidity in September in Derby?

In Derby, New York, the average relative humidity in September is 78%.

How many days does it rain in September in Derby?

In Derby, during September, the rain falls for 14.2 days and regularly aggregates up to 1.57" (40mm) of precipitation.

When it does not snow in Derby?

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

Does it snow in Derby in September?

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

How many hours of daylight does Derby have in September?

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

When are sunrise and sunset in September in Derby?

On the first day of September in Derby, sunrise is at 6:41 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:58 pm EDT.

How many hours of sunshine does Derby have in September?

In September, the average sunshine duration is 8.9h.

What is the UV index reading in September in Derby?

In Derby, New York, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium health risk 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
Derby, NY

Average temperature in September - Derby, NY
  • Average high temperature in September: 70.2°F

The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in September: 54.7°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

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Average pressure in September
Derby, NY

Average pressure in September - Derby, 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).

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Average wind speed in September
Derby, NY

Average wind speed in September - Derby, NY
  • Average wind speed in September: 7.5mph

The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).

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Average humidity in September
Derby, NY

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

The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are August and September (78%).

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Average rainfall in September
Derby, NY

Average rainfall in September - Derby, NY
  • Average rainfall in September: 1.57"

The wettest month (with the highest rainfall) is July (2.52").
The driest month (with the least rainfall) is January (1.54").

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Average rainfall days in September
Derby, NY

Average rainfall days in September - Derby, NY
  • Average rainfall days in September: 14.2 days

The months with the highest number of rainy days are July and October (18.1 days).
The month with the least rainy days is February (7 days).

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Average snowfall in September
Derby, NY

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

The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Derby, NY

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

The month with the highest number of snowfall days is January (15.6 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
Derby, NY

Average daylight in September / Average sunshine in September - Derby, 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: 8h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).

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Average sunshine days in September
Derby, NY

Average sunshine days in September - Derby, NY
  • Average sunshine days in September: 12.6 days

The month with the most sunshine days is March (13 days).
The month with the least sunshine days is January (8.3 days).

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Average UV index in September
Derby, NY

Average UV index in September - Derby, NY
  • Average UV index in September: 3

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

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Average cloud cover in September
Derby, NY

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

The month with the most cloud cover is January (Cloud cover 76).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in September
Derby, NY

Average visibility in September - Derby, NY
  • Average visibility in September: 6mi

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

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Derby, New York, USA

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