September weather forecastSummerville, PA

September

Weather in September

The first month of the autumn, September, is also an agreeable month in Summerville, Pennsylvania, with an average temperature ranging between min 52.2°F (11.2°C) and max 72.1°F (22.3°C).

Temperature

With the onset of September, Summerville's average high-temperature slightly adjusts, moderately receding from August's warm 78.6°F (25.9°C) to an agreeable 72.1°F (22.3°C). During the month of September, Summerville anticipates a mean low-temperature of 52.2°F (11.2°C).

Humidity

The average relative humidity in September is 80%.

Rainfall

In Summerville, in September, it is raining for 12.7 days, with typically 1.73" (44mm) of accumulated precipitation. Throughout the year, there are 150.5 rainfall days, and 22.05" (560mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Summerville.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:44 am and sunset at 7:48 pm. On the last day of September, sunrise is at 7:13 am and sunset at 6:59 pm EDT.

Sunshine

In Summerville, the average sunshine in September is 8.3h.

UV index

In September, the average daily maximum UV index in Summerville is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 3 during September translates into the following guidance:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Employ a wide-brim hat for potent defense against up to 50% of UV rays.

Updated: Aug 1, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Summerville, in September, the average high-temperature is 72.1°F (22.3°C), and the average low-temperature is 52.2°F (11.2°C). In July, the average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, is computed to be 86°F (30°C).

In Summerville, the average relative humidity in September is 80%.

In Summerville, in September, during 12.7 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

June through September are months without snowfall.

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

In Summerville, the average day length in September is 12h and 28min.

In September, on the first day of the month, sunrise is at 6:44 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 6:59 pm EDT.

The average sunshine duration in September is 8.3h.

In Summerville, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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

78.6°F

72.1°F

58.6°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5.9mph

6.2mph

7.8mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

13.9

14.9

14.6

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Summerville, PA

Average high temperature in September: 72.1°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (30.2°F).

Average low temperature in September: 52.2°F

The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).

Average pressure in September
Summerville, PA

Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Summerville, PA

Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in September
Summerville, PA

Average humidity in September: 80%

The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are June, July and August (78%).

Average rainfall in September
Summerville, PA

Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is April (2.56").
The driest month (with the least rainfall) is November (1.26").

Average rainfall days in September
Summerville, PA

Average rainfall days in September: 12.7 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.2 days).

Average snowfall in September
Summerville, PA

Average snowfall in September: 0"

The month with the highest snowfall is February (5.51").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Summerville, PA

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (18 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

Average sunshine in September: 8h and 18min

The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).