September weather forecast
Sweet Briar, PA

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Weather in September

The first month of the autumn, September, is still a warm month in Sweet Briar, Pennsylvania, with an average temperature varying between 76.1°F (24.5°C) and 59°F (15°C).

Temperature

A minor decrease in the average high-temperature is observed during September, shifting from 83.3°F (28.5°C) in August to a still warm 76.1°F (24.5°C). The low-temperature averages to a refreshing 59°F (15°C) during the nights of September.

Humidity

The average relative humidity in September is 76%.

Rainfall

In Sweet Briar, in September, during 10.8 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 138.2 rainfall days, and 15.59" (396mm) of precipitation is accumulated.

Snowfall

April, June through November are months without snowfall.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:29 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:44 pm EDT.

Sunshine

In September, the average sunshine is 8.8h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Aug 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

The high-temperature, in September, in Sweet Briar, records 76.1°F (24.5°C), while the low-temperature is 59°F (15°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is appraised at 89.6°F (32°C).

What is the average humidity in September?

In September, the average relative humidity is 76%.

How much does it rain in September?

In Sweet Briar, in September, during 10.8 rainfall days, 0.98" (25mm) of precipitation is typically accumulated.

When it does not snow?

In Sweet Briar, snow does not fall in April, June through November.

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?

On the first day of September, sunrise is at 6:29 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:44 pm EDT.

How many hours of sunshine does Sweet Briar have in September?

The average sunshine duration in September is 8.8h.

What is the UV index intensity in September?

In September, the average daily maximum UV index 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
Sweet Briar, PA

Average temperature in September - Sweet Briar, PA
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in September: 59°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in September
Sweet Briar, PA

Average pressure in September - Sweet Briar, 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
Sweet Briar, PA

Average wind speed in September - Sweet Briar, PA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in September
Sweet Briar, PA

Average humidity in September - Sweet Briar, PA
  • Average humidity in September: 76%

The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April and July (72%).

Average rainfall in September
Sweet Briar, PA

Average rainfall in September - Sweet Briar, PA
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is July (1.89").
The driest month (with the least rainfall) is February (0.91").

Average rainfall days in September
Sweet Briar, PA

Average rainfall days in September - Sweet Briar, PA
  • Average rainfall days in September: 10.8 days

The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is November (7.4 days).

Average snowfall in September
Sweet Briar, PA

Average snowfall in September - Sweet Briar, PA
  • Average snowfall in September: 0"

The months with the highest snowfall are February and March (0.55").
The months with the least snowfall are April, June, July, August, September, October and November (0").

Average snowfall days in September
Sweet Briar, PA

Average snowfall days in September - Sweet Briar, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Sweet Briar, PA

Average daylight in September / Average sunshine in September - Sweet Briar, 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 48min).

Average sunshine days in September
Sweet Briar, PA

Average sunshine days in September - Sweet Briar, PA
  • Average sunshine days in September: 17.3 days

The month with the most sunshine days is November (20.5 days).
The months with the least sunshine days are May and June (12.8 days).

Average UV index in September
Sweet Briar, PA

Average UV index in September - Sweet Briar, 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
Sweet Briar, PA

Average cloud cover in September - Sweet Briar, 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 32).

Average visibility in September
Sweet Briar, PA

Average visibility in September - Sweet Briar, 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).

Sweet Briar, Pennsylvania, USA

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