September weather forecast
Cornell, PA

Share

Weather in September

September, the first month of the autumn in Cornell, is still a warm month, with an average temperature fluctuating between 59.4°F (15.2°C) and 76.3°F (24.6°C).

Temperature

September brings a minor shift in the average high-temperature, adjusting from a warm 83.3°F (28.5°C) in August to a still moderately hot 76.3°F (24.6°C). Cornell temperatures generally rest at a low of 59.4°F (15.2°C) during the September nights.

Humidity

In Cornell, Pennsylvania, the average relative humidity in September is 75%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.2 days and accumulates 1.89" (48mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:31 pm. On the last day of September, in Cornell, sunrise is at 6:56 am and sunset at 6:43 pm EDT.

Sunshine

In September, the average sunshine is 8.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 4 during September translates into the following directions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

September temperatures vary between a high-temperature of 76.3°F (24.6°C) and a low-temperature of 59.4°F (15.2°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 89.6°F (32°C).

What is the average humidity in September in Cornell?

In Cornell, the average relative humidity in September is 75%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 12.2 days and typically collects 1.89" (48mm) of precipitation.

How many days does it rain in September?

In Cornell, during September, the rain falls for 12.2 days and regularly aggregates up to 1.89" (48mm) of precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

The average day length in September is 12h and 27min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:28 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:43 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.7h.

What is the UV index reading in September?

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 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
Cornell, PA

Average temperature in September - Cornell, PA
  • Average high temperature in September: 76.3°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in September: 59.4°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in September
Cornell, PA

Average pressure in September - Cornell, PA
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Cornell, PA

Average wind speed in September - Cornell, PA
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in September
Cornell, PA

Average humidity in September - Cornell, PA
  • Average humidity in September: 75%

The months with the highest relative humidity are February and October (78%).
The months with the lowest relative humidity are April, July and August (72%).

Average rainfall in September
Cornell, PA

Average rainfall in September - Cornell, PA
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is December (3.31").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in September
Cornell, PA

Average rainfall days in September - Cornell, PA
  • Average rainfall days in September: 12.2 days

The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is November (8.5 days).

Average snowfall in September
Cornell, PA

Average snowfall in September - Cornell, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (3.78").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Cornell, PA

Average snowfall days in September - Cornell, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Cornell, PA

Average daylight in September / Average sunshine in September - Cornell, PA
  • Average daylight in September: 12h and 2min

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 24min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in September
Cornell, PA

Average sunshine days in September - Cornell, PA
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is June (11.4 days).

Average UV index in September
Cornell, PA

Average UV index in September - Cornell, PA
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in September
Cornell, PA

Average cloud cover in September - Cornell, PA
  • Average cloud cover in September: 38

The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in September
Cornell, PA

Average visibility in September - Cornell, PA
  • Average visibility in September: 5mi

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

Cornell, Pennsylvania, USA

Weather forecast for your location

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