September weather forecast
Harrisburg, PA

A church, a mosque, and other buildings along State Street in Harrisburg, Pennsylvania
A church, a mosque, and other buildings along State Street in Harrisburg, Pennsylvania

Weather in September

September, the first month of the autumn in Harrisburg, is still a warm month, with an average temperature ranging between max 74.3°F (23.5°C) and min 55.6°F (13.1°C).

Temperature

In September, the average high-temperature slightly decreases from 81.5°F (27.5°C) in August to a still warm 74.3°F (23.5°C). In September, the average low-temperature is 55.6°F (13.1°C).

Humidity

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

Rainfall

In Harrisburg, in September, it is raining for 9.7 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, there are 122.3 rainfall days, and 11.73" (298mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Harrisburg.

Daylight

The average length of the day in September in Harrisburg is 12h and 27min.
On the first day of September in Harrisburg, sunrise is at 6:35 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:52 pm EDT.

Sunshine

The average sunshine in September in Harrisburg, Pennsylvania, is 9h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Harrisburg?

In Harrisburg, in September, the average high-temperature is 74.3°F (23.5°C), and the average low-temperature is 55.6°F (13.1°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 87.8°F (31°C).

What is the average humidity in September in Harrisburg?

The average relative humidity in September in Harrisburg, Pennsylvania, is 78%.

How many days does it rain in September in Harrisburg?

In Harrisburg, Pennsylvania, during September, the rain falls for 9.7 days and regularly aggregates up to 0.79" (20mm) of precipitation.

When it does not snow in Harrisburg?

In Harrisburg, Pennsylvania, snow does not fall in May through October.

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

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

When are sunrise and sunset in September in Harrisburg?

In September, on the first day of the month, sunrise is at 6:35 am and sunset at 7:40 pm. On the last day of the month, in Harrisburg, Pennsylvania, sunrise is at 7:02 am and sunset at 6:52 pm EDT.

How long on average sun shines in September in Harrisburg?

In September, the average sunshine duration is 9h.

How high is the UV index in September in Harrisburg?

The average daily maximum UV index in September in Harrisburg, Pennsylvania, is 4. A UV Index estimate of 3 to 5 represents a medium health risk from 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
Harrisburg, PA

Average temperature in September - Harrisburg, PA
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in September: 55.6°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).

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Average pressure in September
Harrisburg, PA

Average pressure in September - Harrisburg, PA
  • Average pressure in September: 30.06"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
Harrisburg, PA

Average wind speed in September - Harrisburg, PA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

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Average humidity in September
Harrisburg, PA

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

The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are March and April (75%).

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Average rainfall in September
Harrisburg, PA

Average rainfall in September - Harrisburg, PA
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is August (1.3").
The driest months (with the least rainfall) are January and February (0.71").

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Average rainfall days in September
Harrisburg, PA

Average rainfall days in September - Harrisburg, PA
  • Average rainfall days in September: 9.7 days

The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is January (5.7 days).

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Average snowfall in September
Harrisburg, PA

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

The month with the highest snowfall is February (1.3").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Harrisburg, PA

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

The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

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

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 22min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

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Average sunshine days in September
Harrisburg, PA

Average sunshine days in September - Harrisburg, PA
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is July (14.1 days).

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Average UV index in September
Harrisburg, PA

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

The months with the highest UV index are May, June and July (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
Harrisburg, PA

Average cloud cover in September - Harrisburg, PA
  • Average cloud cover in September: 37

The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in September
Harrisburg, PA

Average visibility in September - Harrisburg, 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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