September weather forecast
Carnegie, PA

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Weather in September

September, the first month of the autumn in Carnegie, is still a warm month, with an average temperature ranging between min 55.8°F (13.2°C) and max 75.7°F (24.3°C).

Temperature

As September arrives, Carnegie's weather displays a minor decrease in high-temperatures, transitioning from August's 82.4°F (28°C) to a still warm 75.7°F (24.3°C). Throughout September, Carnegie experiences a low-temperature average of 55.8°F (13.2°C).

Humidity

The average relative humidity in September is 77%.

Rainfall

In Carnegie, during September, the rain falls for 10.6 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, there are 132.6 rainfall days, and 11.5" (292mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

In September, the average length of the day in Carnegie is 12h and 27min.
On the first day of September, sunrise is at 6:48 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:03 pm EDT.

Sunshine

In September, the average sunshine is 8.5h.

UV index

In Carnegie, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the UV index of 4 transforms into the following advice:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

The high-temperature, in September, in Carnegie, records 75.7°F (24.3°C), while the low-temperature is 55.8°F (13.2°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, is appraised at 87.8°F (31°C).

What is the average humidity in September?

In September, the average relative humidity is 77%.

How much does it rain in September?

In Carnegie, Pennsylvania, during September, the rain falls for 10.6 days and regularly aggregates up to 0.79" (20mm) of precipitation.

When it does not snow?

In Carnegie, snow does not fall in May through October.

What is the average length of the day in September?

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

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:48 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:03 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.5h.

What is the UV index intensity in September in Carnegie?

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

Average temperature in September - Carnegie, PA
  • Average high temperature in September: 75.7°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 55.8°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 (21°F).

Average pressure in September
Carnegie, PA

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

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Carnegie, PA

Average wind speed in September - Carnegie, PA
  • Average wind speed in September: 5.1mph

The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

Average humidity in September
Carnegie, PA

Average humidity in September - Carnegie, PA
  • Average humidity in September: 77%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (75%).

Average rainfall in September
Carnegie, PA

Average rainfall in September - Carnegie, PA
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is November (0.67").

Average rainfall days in September
Carnegie, PA

Average rainfall days in September - Carnegie, PA
  • Average rainfall days in September: 10.6 days

The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is February (6.4 days).

Average snowfall in September
Carnegie, PA

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

The month with the highest snowfall is February (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Carnegie, PA

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

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

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

Average daylight in September / Average sunshine in September - Carnegie, 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 18min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in September
Carnegie, PA

Average sunshine days in September - Carnegie, PA
  • Average sunshine days in September: 16.4 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (12.2 days).

Average UV index in September
Carnegie, PA

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

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

Average cloud cover in September
Carnegie, PA

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

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).

Average visibility in September
Carnegie, PA

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

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

Carnegie, Pennsylvania, USA

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