Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a moderately hot 77.5°F (25.3°C) in August to an agreeable 70.3°F (21.3°C). During September nights, Saint Marys records an average temperature of 50.5°F (10.3°C).Humidity
In Saint Marys, Pennsylvania, the average relative humidity in September is 81%.Rainfall
In Saint Marys, in September, it is raining for 9.9 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, 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
In Saint Marys, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:41 am and sunset at 7:46 pm. On the last day of the month, 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 of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, the average maximum UV index of 3 translates into the following recommendations:
Take precautions - Protection against sunburn is recommended. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Saint Marys have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Saint Marys have in September?
What is the UV index intensity in September?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
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).
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).
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).
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).
Saint Marys, Pennsylvania, USA
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