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
A modest decline in the average high-temperature is seen during September, decreasing from a warm 83.8°F (28.8°C) in August to a still moderately hot 77.9°F (25.5°C). Saint Marys observes an average low-temperature of 56.7°F (13.7°C) during September nights.Humidity
In Saint Marys, West Virginia, the average relative humidity in September is 77%.Rainfall
September is the month with the least rainfall in Saint Marys. Rain falls for 13.9 days and accumulates 2.05" (52mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Saint Marys, the average length of the day in September is 12h and 26min.On the first day of September in Saint Marys, sunrise is at 6:53 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:08 pm EDT.
Sunshine
In Saint Marys, West Virginia, the average sunshine in September is 8.4h.UV index
The average daily maximum UV index in September in Saint Marys is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Saint Marys?
What is the average humidity in September in Saint Marys?
What is the driest month in Saint Marys?
How many days does it rain in September in Saint Marys?
When it does not snow in Saint Marys?
Does it snow in Saint Marys in September?
How many hours of daylight does Saint Marys have in September?
When is the sunrise / sunset in September in Saint Marys?
How many hours of sunshine does Saint Marys have in September?
How high is the UV index in September in Saint Marys?
Average temperature in September
Saint Marys, WV
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in September
Saint Marys, WV
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Saint Marys, WV
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is February (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in September
Saint Marys, WV
- Average humidity in September: 77%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (76%).
Average rainfall in September
Saint Marys, WV
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in September
Saint Marys, WV
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is November (10.7 days).
Average snowfall in September
Saint Marys, WV
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.84").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Saint Marys, WV
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Marys, WV
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Saint Marys, WV
- Average sunshine days in September: 13.1 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (8.5 days).
Average UV index in September
Saint Marys, WV
- Average UV index in September: 4
The months with the highest UV index are 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
Saint Marys, WV
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Saint Marys, WV
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The month with the lowest visibility is January (4mi).
Saint Marys, West Virginia, USA
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