Pennsylvania, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Exton, PA

The first month of the autumn, September, is still a warm month in Exton, Pennsylvania, with average temperature fluctuating between 53.6°F (12°C) and 78.8°F (26°C).


In Exton, Pennsylvania, the average high-temperature decreases, from a tropical 89.6°F (32°C) in August, to a warm 78.8°F (26°C). The average low-temperature, in September, is 53.6°F (12°C).


Throughout September, 3.7" (94mm) of precipitation is accumulated. Throughout the year, 45.8" (1164mm) of rain is accumulated.


In September, the average length of the day in Exton is 12.4h.

What is the temperature in September in Exton?

In Exton, Pennsylvania, in September, the average high-temperature is 78.8°F (26°C), and the average low-temperature is 53.6°F (12°C).

How much does it rain in Exton in September?

During September, Exton regularly aggregates up to 3.7" (94mm) of precipitation.

What is the average length of the day in September in Exton?

In Exton, the average length of the day in September is 12.4h.
Average temperature in September - Exton, PA
  • Average high temperature in September: 78.8°F

The warmest month (with the highest average high temperature) is July (91.4°F).
The month with the lowest average high temperature is January (51.8°F).

  • Average low temperature in September: 53.6°F

The month with the highest average low temperature is June (68°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).

Average rainfall in September - Exton, PA
  • Average rainfall in September: 3.7"

Wettest months (with the highest rainfall) are June and August (4.5").
Driest months (with the lowest rainfall) are February, October and November (3.3").

Average daylight in September - Exton, PA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9.4h).