September weather forecastSaint Clairsville, OH
September
Weather in September
The first month of the autumn, September, is still a warm month in Saint Clairsville, Ohio, with an average temperature ranging between max 75.6°F (24.2°C) and min 55.2°F (12.9°C).Temperature
The commencement of September indicates a gentle shift in the average high-temperature, receding from August's 81.7°F (27.6°C) to a still warm 75.6°F (24.2°C). Throughout September, Saint Clairsville witnesses a consistent average low-temperature of 55.2°F (12.9°C).Humidity
In Saint Clairsville, the average relative humidity in September is 79%.Rainfall
In September, the rain falls for 13.4 days. Throughout September, 1.65" (42mm) of precipitation is accumulated. Throughout the year, there are 159.9 rainfall days, and 22.99" (584mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Saint Clairsville.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:52 am and sunset at 7:54 pm. On the last day of September, sunrise is at 7:19 am and sunset at 7:07 pm EDT.
Sunshine
In September, the average sunshine is 8.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint Clairsville, OH
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in September
Saint Clairsville, OH
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Saint Clairsville, OH
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in September
Saint Clairsville, OH
- Average humidity in September: 79%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Saint Clairsville, OH
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is April (2.4").
The driest month (with the least rainfall) is November (1.5").
Average rainfall days in September
Saint Clairsville, OH
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is May (19.1 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
Saint Clairsville, OH
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Clairsville, OH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.5 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 Clairsville, OH
- Average daylight in September: 12h and 24min
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 12min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Saint Clairsville, OH
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is February (9.4 days).
Average UV index in September
Saint Clairsville, OH
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Saint Clairsville, OH
- Average cloud cover in September: 40
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Saint Clairsville, OH
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January and February (4mi).
