September weather forecast
Wynnewood, PA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Wynnewood, Pennsylvania, with temperature in the range of an average high of 76.5°F (24.7°C) and an average low of 59.9°F (15.5°C).

Temperature

The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a moderately hot 83.7°F (28.7°C) to a still warm 76.5°F (24.7°C). Throughout September, Wynnewood witnesses a nighttime temperature average of 59.9°F (15.5°C).

Humidity

The average relative humidity in September is 75%.

Rainfall

In Wynnewood, during September, the rain falls for 10.1 days and regularly aggregates up to 0.63" (16mm) of precipitation. In Wynnewood, during the entire year, the rain falls for 111.8 days and collects up to 9.69" (246mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:29 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm EDT.

Sunshine

In Wynnewood, Pennsylvania, the average sunshine in September is 8.6h.

UV index

The average daily maximum UV index in September in Wynnewood, Pennsylvania, is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: A daily maximum UV index of 5 in September translates into the following instructions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. To cut down UV radiation exposure by about half, sport a wide-brim hat.

Frequently asked questions

What is the average September temperature?

September temperatures vary between a high-temperature of 76.5°F (24.7°C) and a low-temperature of 59.9°F (15.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in August is estimated at 89.6°F (32°C).

What is the average humidity in September in Wynnewood?

In September, the average relative humidity is 75%.

How many days does it rain in September?

In September, the rain falls for 10.1 days. Throughout September, 0.63" (16mm) of precipitation is accumulated.

When it does not snow?

In Wynnewood, snow does not fall in April through October.

How many hours of daylight does Wynnewood have in September?

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

What time are sunrise and sunset in September?

On the first day of September in Wynnewood, sunrise is at 6:29 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.6h.

How high is the UV index in September?

In September, the average daily maximum UV index is 5. 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
Wynnewood, PA

Average temperature in September - Wynnewood, PA
  • Average high temperature in September: 76.5°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in September
Wynnewood, PA

Average pressure in September - Wynnewood, PA
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Wynnewood, PA

Average wind speed in September - Wynnewood, PA
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in September
Wynnewood, PA

Average humidity in September - Wynnewood, PA
  • Average humidity in September: 75%

The months with the highest relative humidity are February and October (78%).
The months with the lowest relative humidity are April, July and August (71%).

Average rainfall in September
Wynnewood, PA

Average rainfall in September - Wynnewood, PA
  • Average rainfall in September: 0.63"

The wettest months (with the highest rainfall) are July and August (1.14").
The driest month (with the least rainfall) is January (0.55").

Average rainfall days in September
Wynnewood, PA

Average rainfall days in September - Wynnewood, PA
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is January (5.3 days).

Average snowfall in September
Wynnewood, PA

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

The months with the highest snowfall are February and March (0.98").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Wynnewood, PA

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

The month with the highest number of snowfall days is January (4.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Wynnewood, 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 4min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in September
Wynnewood, PA

Average sunshine days in September - Wynnewood, PA
  • Average sunshine days in September: 18.5 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is July (14.9 days).

Average UV index in September
Wynnewood, PA

Average UV index in September - Wynnewood, PA
  • Average UV index in September: 5

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

Average cloud cover in September
Wynnewood, PA

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

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in September
Wynnewood, PA

Average visibility in September - Wynnewood, PA
  • Average visibility in September: 6mi

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

Wynnewood, Pennsylvania, USA

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