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

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
September, the first month of the autumn, in Harrisburg, is still a warm month, with average temperature ranging between min 56.1°F (13.4°C) and max 75.6°F (24.2°C).

Temperature

In Harrisburg, the average high-temperature in September marginally drops, from a warm 83.5°F (28.6°C) in August, to a still moderately hot 75.6°F (24.2°C). In September, the average low-temperature is 56.1°F (13.4°C).

Humidity

The most humid month in Harrisburg, Pennsylvania, is September, with an average relative humidity of 73.8%.

Rainfall

In Harrisburg, during September, the rain falls for 9.2 days and regularly aggregates up to 4.1" (103.4mm) of precipitation. In Harrisburg, during the entire year, the rain falls for 122 days and collects up to 40.7" (1034.8mm) of precipitation.

Snowfall

In Harrisburg snow does not fall in May through October.

Daylight

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

Sunshine

In September, the average sunshine is 7.6h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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.

What is the temperature in September in Harrisburg?

The average high-temperature, in September, in Harrisburg, is 75.6°F (24.2°C), while the average low-temperature is 56.1°F (13.4°C).

What is the most humid month in Harrisburg?

The most humid month in Harrisburg is September, with an average relative humidity of 73.8%.

What is the average humidity in September in Harrisburg?

In September, the average relative humidity in Harrisburg is 73.8%.

How many days does it rain in September in Harrisburg?

In Harrisburg, during September, the rain falls for 9.2 days and regularly aggregates up to 4.1" (103.4mm) of precipitation.

When it does not snow in Harrisburg?

May through October are months without snowfall in Harrisburg, Pennsylvania.

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

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

How many hours of sunshine does Harrisburg have in September?

The average sunshine in September is 7.6h.

How high is the UV index in September in Harrisburg?

In Harrisburg, Pennsylvania, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Harrisburg, PA
  • Average high temperature in September: 75.6°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in September: 56.2°F

The month with the highest average low temperature is July (66.3°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

Average humidity in September - Harrisburg, PA
  • Average humidity in September: 73.8%

The month with the highest relative humidity is September (73.8%).
The month with the lowest relative humidity is April (59.2%).

Average rainfall in September - Harrisburg, PA
  • Average rainfall in September: 4.1"

The wettest month (with the highest rainfall) is July (4.6").
The driest month (with the lowest rainfall) is February (2.4").

Average rainfall days in September - Harrisburg, PA
  • Average rainfall days in September: 9.2 days

The month with the highest number of rainy days is May (12.2 days).
The month with the lowest number of rainy days is October (8.8 days).

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

The month with the highest snowfall is February (10.5").
Months with the lowest snowfall are May, June, July, August, September and October (0").

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 (5.2 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

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 shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 7.6h

The month with most sunshine is July (Average sunshine: 10h).
The month with least sunshine is December (Average sunshine: 4.1h).

Average UV index in September - Harrisburg, PA
  • Average UV index in September: 6

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).