September weather forecast
Pittsburgh, PA

A beautiful dusk panorama of Pittsburgh, Pennsylvania, with the river and several bridges
A beautiful dusk panorama of Pittsburgh, Pennsylvania, with the river and several bridges

Weather in September

The first month of the autumn, September, is also a moderately hot month in Pittsburgh, Pennsylvania, with an average temperature fluctuating between 75.7°F (24.3°C) and 55.9°F (13.3°C).

Temperature

In September, the average high-temperature slightly decreases from 82.2°F (27.9°C) in August to a still warm 75.7°F (24.3°C). In Pittsburgh, in September, the average low-temperature is 55.9°F (13.3°C).

Humidity

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

Rainfall

In September, in Pittsburgh, the rain falls for 12.9 days. Throughout September, 2.13" (54mm) of precipitation is accumulated. In Pittsburgh, Pennsylvania, during the entire year, the rain falls for 163.6 days and collects up to 26.93" (684mm) of precipitation.

Snowfall

May through September are months without snowfall in Pittsburgh, Pennsylvania.

Daylight

In Pittsburgh, Pennsylvania, the average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:47 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:04 pm EDT.

Sunshine

In September, the average sunshine is 8.2h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Pittsburgh?

In September, in Pittsburgh, Pennsylvania, the average high-temperature is 75.7°F (24.3°C), and the average low-temperature is 55.9°F (13.3°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, in August is computed to be 87.8°F (31°C).

What is the average humidity in September in Pittsburgh?

The average relative humidity in September in Pittsburgh, Pennsylvania, is 76%.

How many days does it rain in September in Pittsburgh?

In Pittsburgh, during September, the rain falls for 12.9 days and regularly aggregates up to 2.13" (54mm) of precipitation.

When it does not snow in Pittsburgh?

May through September are months without snowfall in Pittsburgh, Pennsylvania.

Does it snow in Pittsburgh in September?

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

How many hours of daylight does Pittsburgh have in September?

In Pittsburgh, the average day length in September is 12h and 27min.

What time are sunrise and sunset in September in Pittsburgh?

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:52 pm. On the last day of the month, in Pittsburgh, sunrise is at 7:15 am and sunset at 7:04 pm EDT.

How many hours of sunshine does Pittsburgh have in September?

In Pittsburgh, the average sunshine duration in September is 8.2h.

What is the UV index intensity in September in Pittsburgh?

The average daily maximum UV index in September in Pittsburgh, Pennsylvania, is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Pittsburgh, PA

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

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.1°F).

  • Average low temperature in September: 55.9°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21°F).

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Average pressure in September
Pittsburgh, PA

Average pressure in September - Pittsburgh, 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).

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Average wind speed in September
Pittsburgh, PA

Average wind speed in September - Pittsburgh, PA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

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Average humidity in September
Pittsburgh, PA

Average humidity in September - Pittsburgh, PA
  • Average humidity in September: 76%

The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are July and August (73%).

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Average rainfall in September
Pittsburgh, PA

Average rainfall in September - Pittsburgh, PA
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is November (1.54").

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Average rainfall days in September
Pittsburgh, PA

Average rainfall days in September - Pittsburgh, PA
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is January (8.9 days).

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Average snowfall in September
Pittsburgh, PA

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

The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Pittsburgh, PA

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

The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Pittsburgh, PA
  • Average daylight in September: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 1min).
The month with the shortest days is December (Average daylight: 9h and 20min).

  • Average sunshine in September: 8h and 12min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

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Average sunshine days in September
Pittsburgh, PA

Average sunshine days in September - Pittsburgh, PA
  • Average sunshine days in September: 13.8 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (9.6 days).

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Average UV index in September
Pittsburgh, PA

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

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

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Average cloud cover in September
Pittsburgh, PA

Average cloud cover in September - Pittsburgh, PA
  • Average cloud cover in September: 40

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 34).

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Average visibility in September
Pittsburgh, PA

Average visibility in September - Pittsburgh, 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).

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