September weather forecast
Gwynedd Valley, PA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Gwynedd Valley, Pennsylvania, with an average temperature ranging between min 58.3°F (14.6°C) and max 75.9°F (24.4°C).

Temperature

As Gwynedd Valley enters September, the average high-temperature subtly lowers from the a warm 82.8°F (28.2°C) of August to a still moderately hot 75.9°F (24.4°C). During the month of September, an average low-temperature of 58.3°F (14.6°C) is recorded in Gwynedd Valley.

Humidity

The average relative humidity in September is 76%.

Rainfall

The month with the least rainfall is September, when the rain falls for 9.4 days and typically collects 0.59" (15mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

In Gwynedd Valley, the average length of the day in September is 12h and 27min.
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

The average sunshine in September is 8.9h.

UV index

In Gwynedd Valley, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 4 in September interprets into the following advice:
Exercise prevention - Precautions against solar damage are endorsed. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

In September, in Gwynedd Valley, the average high-temperature is 75.9°F (24.4°C), and the average low-temperature is 58.3°F (14.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is computed to be 87.8°F (31°C).

What is the average humidity in September?

In September, the average relative humidity is 76%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 9.4 days and accumulates 0.59" (15mm) of precipitation.

How many days does it rain in September?

In Gwynedd Valley, during September, the rain falls for 9.4 days and regularly aggregates up to 0.59" (15mm) of precipitation.

When it does not snow?

June through October are months without snowfall.

What is the average length of the day in September in Gwynedd Valley?

In September, the average day length in Gwynedd Valley is 12h and 27min.

When is the sunrise / sunset in September?

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.

How long on average sun shines in September?

In Gwynedd Valley, the average sunshine duration in September is 8.9h.

What is the UV index intensity in September?

In Gwynedd Valley, Pennsylvania, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health 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
Gwynedd Valley, PA

Average temperature in September - Gwynedd Valley, PA
  • Average high temperature in September: 75.9°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in September: 58.3°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).

Average pressure in September
Gwynedd Valley, PA

Average pressure in September - Gwynedd Valley, PA
  • Average pressure in September: 30.06"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
Gwynedd Valley, PA

Average wind speed in September - Gwynedd Valley, PA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in September
Gwynedd Valley, PA

Average humidity in September - Gwynedd Valley, PA
  • Average humidity in September: 76%

The months with the highest relative humidity are February, October and December (79%).
The months with the lowest relative humidity are April, July and August (73%).

Average rainfall in September
Gwynedd Valley, PA

Average rainfall in September - Gwynedd Valley, PA
  • Average rainfall in September: 0.59"

The wettest month (with the highest rainfall) is July (1.3").
The driest month (with the least rainfall) is September (0.59").

Average rainfall days in September
Gwynedd Valley, PA

Average rainfall days in September - Gwynedd Valley, PA
  • Average rainfall days in September: 9.4 days

The month with the highest number of rainy days is July (13.8 days).
The months with the least rainy days are January and February (6.3 days).

Average snowfall in September
Gwynedd Valley, PA

Average snowfall in September - Gwynedd Valley, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (1.02").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Gwynedd Valley, PA

Average snowfall days in September - Gwynedd Valley, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Gwynedd Valley, PA

Average daylight in September / Average sunshine in September - Gwynedd Valley, 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 5min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in September
Gwynedd Valley, PA

Average sunshine days in September - Gwynedd Valley, PA
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is July (13.9 days).

Average UV index in September
Gwynedd Valley, PA

Average UV index in September - Gwynedd Valley, PA
  • Average UV index in September: 4

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, March, November and December (UV index 2).

Average cloud cover in September
Gwynedd Valley, PA

Average cloud cover in September - Gwynedd Valley, PA
  • Average cloud cover in September: 38

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in September
Gwynedd Valley, PA

Average visibility in September - Gwynedd Valley, PA
  • Average visibility in September: 5mi

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

Gwynedd Valley, Pennsylvania, USA

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