September weather forecast and climate
Williamsville, NY

Weather in September

The first month of the autumn, September, is also an agreeable month in Williamsville, New York, with temperature in the range of an average high of 71.8°F (22.1°C) and an average low of 55°F (12.8°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 78.1°F (25.6°C) in August, to a pleasant 71.8°F (22.1°C). In September, the average low-temperature is 55°F (12.8°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

September is the month with the least rainfall in Williamsville, New York. Rain falls for 11.3 days and accumulates 0.91" (23mm) of precipitation.

Snowfall

June through September are months without snowfall in Williamsville.

Daylight

In September, the average length of the day in Williamsville is 12.5h.

Sunshine

In Williamsville, New York, the average sunshine is 9h.

UV index

In Williamsville, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Williamsville?

In September, the average high-temperature is 71.8°F (22.1°C), and the average low-temperature is 55°F (12.8°C).

What is the average humidity in September in Williamsville?

In September, the average relative humidity in Williamsville is 76%.

How many days does it rain in September in Williamsville?

In Williamsville, in September, it is raining for 11.3 days, with typically 0.91" (23mm) of accumulated precipitation.

What is the driest month in Williamsville?

The month with the least rainfall in Williamsville is September when the rain falls for 11.3 days and typically collects 0.91" (23mm) of precipitation.

Does it snow in Williamsville in September?

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

When it does not snow in Williamsville?

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

How many hours of daylight does Williamsville have in September?

In September, the average length of the day in Williamsville is 12.5h.

How many hours of sunshine does Williamsville have in September?

In Williamsville, the average sunshine in September is 9h.

How high is the UV index in September in Williamsville?

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

Average temperature in September
Williamsville, NY

Average temperature in September - Williamsville, NY
  • Average high temperature in September: 71.8°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

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Average pressure in September
Williamsville, NY

Average pressure in September - Williamsville, NY
  • Average pressure in September: 30.04"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
Williamsville, NY

Average wind speed in September - Williamsville, NY
  • Average wind speed in September: 6.9mph

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in September
Williamsville, NY

Average humidity in September - Williamsville, NY
  • Average humidity in September: 76%

Months with the highest relative humidity are January and February (86%).
Months with the lowest relative humidity are July and August (75%).

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Average rainfall in September
Williamsville, NY

Average rainfall in September - Williamsville, NY
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is July (1.61").
The driest month (with the least rainfall) is September (0.91").

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Average rainfall days in September
Williamsville, NY

Average rainfall days in September - Williamsville, NY
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (6.4 days).

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Average snowfall in September
Williamsville, NY

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

Months with the highest snowfall are January and February (2.95").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Williamsville, NY

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

The month with the highest number of snowfall days is January (15.8 days).
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
Williamsville, NY

Average daylight in September / Average sunshine in September - Williamsville, NY
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in September: 9h

Months with the most sunshine are July and August (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 2.4h).

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Average sunshine days in September
Williamsville, NY

Average sunshine days in September - Williamsville, NY
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is February (10.2 days).

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Average UV index in September
Williamsville, NY

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

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

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Average cloud cover in September
Williamsville, NY

Average cloud cover in September - Williamsville, NY
  • Average cloud cover in September: 35

The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in September
Williamsville, NY

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

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

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