September weather forecast
Riddlesburg, PA

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Weather in September

The first month of the autumn, September, is also an agreeable month in Riddlesburg, Pennsylvania, with an average temperature ranging between max 73°F (22.8°C) and min 53.1°F (11.7°C).

Temperature

The onset of September is marked by a minor decrease in temperature, transitioning from a warm 80.2°F (26.8°C) in August to a pleasant 73°F (22.8°C). An average temperature of 53.1°F (11.7°C) is recorded during the nights in September.

Humidity

In Riddlesburg, the average relative humidity in September is 79%.

Rainfall

In Riddlesburg, Pennsylvania, during September, the rain falls for 12.5 days and regularly aggregates up to 1.38" (35mm) of precipitation. Throughout the year, there are 146.6 rainfall days, and 19.84" (504mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of September, sunrise is at 6:41 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:56 pm EDT.

Sunshine

In Riddlesburg, the average sunshine in September is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: A maximum UV index of 4 in September translates into the following recommendations:
Make use of precautions - It is urged to ward off sun damage. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. 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 Riddlesburg in September?

September temperatures vary between a high-temperature of 73°F (22.8°C) and a low-temperature of 53.1°F (11.7°C). The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in July is evaluated at 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 79%.

How many days does it rain in September?

In September, the rain falls for 12.5 days. Throughout September, 1.38" (35mm) of precipitation is accumulated.

When it does not snow?

In Riddlesburg, snow does not fall in May through September.

Does it snow in September?

In Riddlesburg, 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 26min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:41 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:56 pm EDT.

How many hours of sunshine does Riddlesburg have in September?

In September, the average sunshine duration is 8.5h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe 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
Riddlesburg, PA

Average temperature in September - Riddlesburg, PA
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (32.5°F).

  • Average low temperature in September: 53.1°F

The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).

Average pressure in September
Riddlesburg, PA

Average pressure in September - Riddlesburg, 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
Riddlesburg, PA

Average wind speed in September - Riddlesburg, PA
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in September
Riddlesburg, PA

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

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

Average rainfall in September
Riddlesburg, PA

Average rainfall in September - Riddlesburg, PA
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is November (1.18").

Average rainfall days in September
Riddlesburg, PA

Average rainfall days in September - Riddlesburg, PA
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in September
Riddlesburg, PA

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

The month with the highest snowfall is February (3.74").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Riddlesburg, PA

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

The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Riddlesburg, 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 January (Average sunshine: 4h and 12min).

Average sunshine days in September
Riddlesburg, PA

Average sunshine days in September - Riddlesburg, PA
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).

Average UV index in September
Riddlesburg, PA

Average UV index in September - Riddlesburg, 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
Riddlesburg, PA

Average cloud cover in September - Riddlesburg, PA
  • Average cloud cover in September: 39

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in September
Riddlesburg, PA

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

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

Riddlesburg, Pennsylvania, USA

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