September weather forecast
West Jonestown, PA

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Weather in September

The first month of the autumn, September, is also an agreeable month in West Jonestown, Pennsylvania, with an average temperature fluctuating between 73.2°F (22.9°C) and 54.9°F (12.7°C).

Temperature

September's arrival aligns with a minor decrease in average high-temperatures, from August's warm 79.7°F (26.5°C) to an agreeable 73.2°F (22.9°C). An average temperature of 54.9°F (12.7°C) is recorded during the nights in September.

Humidity

In September, the average relative humidity is 80%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.8 days and accumulates 2.32" (59mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In West Jonestown, the average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:34 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:49 pm EDT.

Sunshine

The average sunshine in September is 8.6h.

UV index

In West Jonestown, Pennsylvania, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 4 during September translates into the following directions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.

Frequently asked questions

What is the usual temperature for West Jonestown in September?

September temperatures vary between a high-temperature of 73.2°F (22.9°C) and a low-temperature of 54.9°F (12.7°C). In July, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 87.8°F (31°C).

What is the average humidity in September?

The average relative humidity in September is 80%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 12.8 days and typically collects 2.32" (59mm) of precipitation.

How much does it rain in September?

In West Jonestown, during September, the rain falls for 12.8 days and regularly aggregates up to 2.32" (59mm) of precipitation.

When it does not snow?

June through September are months without snowfall in West Jonestown.

Does it snow in September?

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

What is the average length of the day in September?

The average day length in September is 12h and 27min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:34 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:49 pm EDT.

How many hours of sunshine does West Jonestown have in September?

In September, the average sunshine duration is 8.6h.

What is the UV index intensity in September in West Jonestown?

The average daily maximum UV index in September is 4. A UV Index reading 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
West Jonestown, PA

Average temperature in September - West Jonestown, PA
  • Average high temperature in September: 73.2°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.6°F).

  • Average low temperature in September: 54.9°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 (21.2°F).

Average pressure in September
West Jonestown, PA

Average pressure in September - West Jonestown, 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 (29.94"Hg).

Average wind speed in September
West Jonestown, PA

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

The windiest month (with the highest average wind speed) is March (8.7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in September
West Jonestown, PA

Average humidity in September - West Jonestown, PA
  • Average humidity in September: 80%

The months with the highest relative humidity are February, May, June and October (81%).
The month with the lowest relative humidity is April (76%).

Average rainfall in September
West Jonestown, PA

Average rainfall in September - West Jonestown, PA
  • Average rainfall in September: 2.32"

The wettest months (with the highest rainfall) are May and July (3.58").
The driest month (with the least rainfall) is September (2.32").

Average rainfall days in September
West Jonestown, PA

Average rainfall days in September - West Jonestown, PA
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (9.1 days).

Average snowfall in September
West Jonestown, PA

Average snowfall in September - West Jonestown, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (5.08").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
West Jonestown, PA

Average snowfall days in September - West Jonestown, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
West Jonestown, PA

Average daylight in September / Average sunshine in September - West Jonestown, 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 18min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

Average sunshine days in September
West Jonestown, PA

Average sunshine days in September - West Jonestown, PA
  • Average sunshine days in September: 15.3 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is May (10.1 days).

Average UV index in September
West Jonestown, PA

Average UV index in September - West Jonestown, PA
  • Average UV index in September: 4

The month with the highest UV index is June (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
West Jonestown, PA

Average cloud cover in September - West Jonestown, PA
  • Average cloud cover in September: 40

The months with the most cloud cover are February and December (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in September
West Jonestown, PA

Average visibility in September - West Jonestown, PA
  • Average visibility in September: 5mi

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

West Jonestown, Pennsylvania, USA

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