September weather forecast
Orrstown, PA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Orrstown, Pennsylvania, with temperature in the range of an average low of 55.4°F (13°C) and an average high of 74.3°F (23.5°C).

Temperature

A mild drop in Orrstown's average high-temperature is observed in September, transitioning from 81.7°F (27.6°C) in August to a still warm 74.3°F (23.5°C). During September, the temperature in Orrstown is averaged to a low of 55.4°F (13°C) at night.

Humidity

The average relative humidity in September in Orrstown is 79%.

Rainfall

In Orrstown, in September, during 13.9 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, there are 156 rainfall days, and 27.2" (691mm) of precipitation is accumulated.

Snowfall

In Orrstown, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:41 pm. On the last day of September, in Orrstown, sunrise is at 7:06 am and sunset at 6:53 pm EDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 4 translates into these guidelines:
Make use of precautions - Shielding skin and eyes from injury is a requirement. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.

Frequently asked questions

What is the average September temperature?

In Orrstown, 74.3°F (23.5°C) is the average high-temperature and 55.4°F (13°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What is the average humidity in September in Orrstown?

In September, the average relative humidity is 79%.

How many days does it rain in September?

In Orrstown, during September, the rain falls for 13.9 days and regularly aggregates up to 1.89" (48mm) of precipitation.

When it does not snow?

In Orrstown, snow does not fall in June through September.

Does it snow in September?

In Orrstown, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Orrstown have in September?

In Orrstown, the average day length in September is 12h and 26min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:38 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:53 pm EDT.

How many hours of sunshine does Orrstown have in September?

In September, the average sunshine duration is 8.5h.

What is the UV index intensity in September in Orrstown?

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

Average temperature in September - Orrstown, 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: 55.4°F

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).

Average pressure in September
Orrstown, PA

Average pressure in September - Orrstown, PA
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Orrstown, PA

Average wind speed in September - Orrstown, PA
  • Average wind speed in September: 5.1mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in September
Orrstown, PA

Average humidity in September - Orrstown, PA
  • Average humidity in September: 79%

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

Average rainfall in September
Orrstown, PA

Average rainfall in September - Orrstown, PA
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is January (1.85").

Average rainfall days in September
Orrstown, PA

Average rainfall days in September - Orrstown, PA
  • Average rainfall days in September: 13.9 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in September
Orrstown, PA

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

The month with the highest snowfall is January (4.92").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Orrstown, PA

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

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Orrstown, 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 3min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

Average sunshine days in September
Orrstown, PA

Average sunshine days in September - Orrstown, PA
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (11.6 days).

Average UV index in September
Orrstown, PA

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

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

Average cloud cover in September
Orrstown, PA

Average cloud cover in September - Orrstown, PA
  • Average cloud cover in September: 40

The months with the most cloud cover are January, February and December (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in September
Orrstown, PA

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

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

Orrstown, Pennsylvania, USA

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