September weather forecast
Saint Marys, PA

Share

Weather in September

The first month of the autumn, September, is still a pleasant month in Saint Marys, Pennsylvania, with an average temperature ranging between max 70.3°F (21.3°C) and min 50.5°F (10.3°C).

Temperature

September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's moderately hot 77.5°F (25.3°C) to an agreeable 70.3°F (21.3°C). Throughout September, Saint Marys anticipates an average low-temperature of 50.5°F (10.3°C).

Humidity

The average relative humidity in September is 81%.

Rainfall

In Saint Marys, in September, during 9.9 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, in Saint Marys, there are 118.9 rainfall days, and 13.31" (338mm) of precipitation is accumulated.

Snowfall

In Saint Marys, snow does not fall in June through September.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:41 am and sunset at 7:46 pm. On the last day of September, in Saint Marys, sunrise is at 7:10 am and sunset at 6:57 pm EDT.

Sunshine

In September, the average sunshine is 8h.

UV index

In Saint Marys, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 3 in September translates into the following recommendations:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
[Resources]

Frequently asked questions

What is the temperature in September in Saint Marys?

In Saint Marys, in September, the average high-temperature is 70.3°F (21.3°C), and the average low-temperature is 50.5°F (10.3°C).

What is the average humidity in September in Saint Marys?

The average relative humidity in September in Saint Marys, Pennsylvania, is 81%.

How many days does it rain in September in Saint Marys?

In Saint Marys, Pennsylvania, in September, during 9.9 rainfall days, 1.02" (26mm) of precipitation is typically accumulated.

When it does not snow in Saint Marys?

In Saint Marys, snow does not fall in June through September.

Does it snow in Saint Marys in September?

In Saint Marys, Pennsylvania, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Saint Marys?

In Saint Marys, Pennsylvania, the average day length in September is 12h and 28min.

When is the sunrise / sunset in September in Saint Marys?

In September, on the first day of the month, sunrise is at 6:41 am and sunset at 7:46 pm. On the last day of the month, in Saint Marys, sunrise is at 7:10 am and sunset at 6:57 pm EDT.

How long on average sun shines in September in Saint Marys?

In September, the average sunshine duration is 8h.

How high is the UV index in September in Saint Marys?

The average daily maximum UV index in September in Saint Marys, Pennsylvania, is 3. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's 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
Saint Marys, PA

Average temperature in September - Saint Marys, PA
  • Average high temperature in September: 70.3°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in September: 50.5°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).

[Resources]

Average pressure in September
Saint Marys, PA

Average pressure in September - Saint Marys, 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).

[Resources]

Average wind speed in September
Saint Marys, PA

Average wind speed in September - Saint Marys, PA
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

[Resources]

Average humidity in September
Saint Marys, PA

Average humidity in September - Saint Marys, PA
  • Average humidity in September: 81%

The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are June and July (78%).

[Resources]

Average rainfall in September
Saint Marys, PA

Average rainfall in September - Saint Marys, PA
  • Average rainfall in September: 1.02"

The wettest month (with the highest rainfall) is April (1.5").
The driest months (with the least rainfall) are January and November (0.83").

[Resources]

Average rainfall days in September
Saint Marys, PA

Average rainfall days in September - Saint Marys, PA
  • Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (5.1 days).

[Resources]

Average snowfall in September
Saint Marys, PA

Average snowfall in September - Saint Marys, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.21").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in September
Saint Marys, PA

Average snowfall days in September - Saint Marys, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Saint Marys, PA

Average daylight in September / Average sunshine in September - Saint Marys, PA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 0min

The months with the most sunshine are July and August (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).

[Resources]

Average sunshine days in September
Saint Marys, PA

Average sunshine days in September - Saint Marys, PA
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (13 days).

[Resources]

Average UV index in September
Saint Marys, PA

Average UV index in September - Saint Marys, PA
  • Average UV index in September: 3

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

[Resources]

Average cloud cover in September
Saint Marys, PA

Average cloud cover in September - Saint Marys, PA
  • Average cloud cover in September: 47

The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is July (Cloud cover 42).

[Resources]

Average visibility in September
Saint Marys, PA

Average visibility in September - Saint Marys, PA
  • Average visibility in September: 4mi

The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (5mi).
The months with the lowest visibility are August and September (4mi).

[Resources]

Saint Marys, Pennsylvania, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location