September weather forecast and climate
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

The first month of the autumn, September, is still a warm month in Harrisburg, Pennsylvania, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 55.6°F (13.1°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 81.5°F (27.5°C) in August, to a still warm 74.3°F (23.5°C). In Harrisburg, 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, during September, the rain falls for 9.7 days and regularly aggregates up to 0.79" (20mm) of precipitation. In Harrisburg, during the entire year, the rain falls for 122.3 days and collects up to 11.73" (298mm) of precipitation.

Snowfall

May through October are months without snowfall in Harrisburg.

Daylight

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

Sunshine

The average sunshine in September is 9h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Harrisburg?

The average high-temperature, in September, is 74.3°F (23.5°C), while the average low-temperature is 55.6°F (13.1°C).

What is the average humidity in September in Harrisburg?

The average relative humidity in September is 78%.

How much does it rain in Harrisburg in September?

In Harrisburg, in September, during 9.7 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.

When it does not snow in Harrisburg?

May through October are months without snowfall in Harrisburg.

How many hours of daylight does Harrisburg have in September?

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

How long on average sun shines in September in Harrisburg?

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

What is the UV index intensity in September in Harrisburg?

In Harrisburg, Pennsylvania, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

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"

The month with the highest atmospheric pressure is November (30.13").
The month with the lowest atmospheric pressure is June (29.95").

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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%).
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").
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).
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: 12.4h

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

  • Average sunshine in September: 9h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.5h).

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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

Months with the highest UV index are May, June and July (UV index 6).
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

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

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

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