September weather forecast
Pottstown, PA

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Weather in September

The first month of the autumn, September, is still a warm month in Pottstown, Pennsylvania, with an average temperature fluctuating between 57.2°F (14°C) and 75.2°F (24°C).

Temperature

The advent of September brings a slight shift in average high-temperature, moving from a moderately hot 81.9°F (27.7°C) in August to a still warm 75.2°F (24°C). Throughout September, an average nighttime temperature of 57.2°F (14°C) is experienced in Pottstown.

Humidity

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

Rainfall

The month with the least rainfall in Pottstown, Pennsylvania, is September, when the rain falls for 12.3 days and typically collects 1.81" (46mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in September in Pottstown is 12h and 27min.
On the first day of September in Pottstown, sunrise is at 6:30 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:46 pm EDT.

Sunshine

The average sunshine in September in Pottstown is 8.8h.

UV index

In September, the average daily maximum UV index in Pottstown is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: A daily maximum UV index of 4 in September translates into the following instructions:
Take necessary precautions - Suggestions to elude sunburn are provided. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
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Frequently asked questions

What are September temperatures in Pottstown?

In Pottstown, 75.2°F (24°C) is the average high-temperature and 57.2°F (14°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 87.8°F (31°C).

What is the average humidity in September in Pottstown?

The average relative humidity in September is 78%.

What is the driest month in Pottstown?

The month with the least rainfall in Pottstown, Pennsylvania, is September, when the rain falls for 12.3 days and typically collects 1.81" (46mm) of precipitation.

How many days does it rain in September in Pottstown?

In Pottstown, during September, the rain falls for 12.3 days and regularly aggregates up to 1.81" (46mm) of precipitation.

When it does not snow in Pottstown?

May through October are months without snowfall.

How many hours of daylight does Pottstown have in September?

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

What time are sunrise and sunset in September in Pottstown?

In September, on the first day of the month, sunrise is at 6:30 am and sunset at 7:33 pm. On the last day of the month, in Pottstown, sunrise is at 6:58 am and sunset at 6:46 pm EDT.

How many hours of sunshine does Pottstown have in September?

The average sunshine duration in September in Pottstown is 8.8h.

What is the UV index reading in September in Pottstown?

In September, the average daily maximum UV index in Pottstown, Pennsylvania, is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health 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
Pottstown, PA

Average temperature in September - Pottstown, PA
  • Average high temperature in September: 75.2°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in September: 57.2°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).

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Average pressure in September
Pottstown, PA

Average pressure in September - Pottstown, 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).

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Average wind speed in September
Pottstown, PA

Average wind speed in September - Pottstown, PA
  • Average wind speed in September: 5.5mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in September
Pottstown, PA

Average humidity in September - Pottstown, PA
  • Average humidity in September: 78%

The months with the highest relative humidity are February and October (80%).
The months with the lowest relative humidity are April and July (75%).

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Average rainfall in September
Pottstown, PA

Average rainfall in September - Pottstown, PA
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is August (3.15").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in September
Pottstown, PA

Average rainfall days in September - Pottstown, PA
  • Average rainfall days in September: 12.3 days

The months with the highest number of rainy days are May and July (17 days).
The month with the least rainy days is January (7.3 days).

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Average snowfall in September
Pottstown, PA

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

The month with the highest snowfall is March (3.7").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Pottstown, PA

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

The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Pottstown, 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 24min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in September
Pottstown, PA

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

The month with the most sunshine days is November (21 days).
The month with the least sunshine days is May (12.3 days).

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Average UV index in September
Pottstown, PA

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

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in September
Pottstown, PA

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

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in September
Pottstown, PA

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

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

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Pottstown, Pennsylvania, USA

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