September weather forecastDonora, PA

September

Weather in September

The first month of the autumn, September, is also a moderately hot month in Donora, Pennsylvania, with an average temperature fluctuating between 55°F (12.8°C) and 75.4°F (24.1°C).

Temperature

September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's 81.9°F (27.7°C) to a still warm 75.4°F (24.1°C). Donora, during the month of September, experiences an average low-temperature of 55°F (12.8°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Donora, in September, it is raining for 14.3 days, with typically 2.4" (61mm) of accumulated precipitation. In Donora, during the entire year, the rain falls for 191.3 days and collects up to 35.24" (895mm) of precipitation.

Snowfall

In Donora, Pennsylvania, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of September, sunrise is at 6:47 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:02 pm EDT.

Sunshine

In Donora, the average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 4 during September leads to these advisories:
Take precautions - Protection against skin and eye damage is obliged. It's recommended to limit sun exposure when its radiation is at its peak during midday. 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.

Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature and low-temperature during September are 75.4°F (24.1°C) and 55°F (12.8°C) respectively. In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 87.8°F (31°C).

In Donora, the average relative humidity in September is 78%.

In September, the rain falls for 14.3 days. Throughout September, 2.4" (61mm) of precipitation is accumulated.

June through September are months without snowfall.

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

In September, the average day length is 12h and 26min.

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:02 pm EDT.

The average sunshine duration in September is 8.7h.

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 Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

81.9°F

75.4°F

62.2°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5mph

5.3mph

6.7mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

12.3

13.7

12.7

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Donora, PA

Average high temperature in September: 75.4°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34°F).

Average low temperature in September: 55°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

Average pressure in September
Donora, PA

Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Donora, PA

Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

Average humidity in September
Donora, PA

Average humidity in September: 78%

The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (76%).

Average rainfall in September
Donora, PA

Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is November (2.13").

Average rainfall days in September
Donora, PA

Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is May (21.8 days).
The months with the least rainy days are January and February (11.7 days).

Average snowfall in September
Donora, PA

Average snowfall in September: 0"

The month with the highest snowfall is January (6.26").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Donora, PA

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (17.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September: 12h and 24min

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 42min

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).