September weather forecastJefferson, OH
September
Weather in September
September, the first month of the autumn in Jefferson, is still a pleasant month, with an average temperature ranging between max 70.7°F (21.5°C) and min 58.6°F (14.8°C).Temperature
On the advent of September, Jefferson's average high-temperature exhibits a minor adjustment to a pleasant 70.7°F (21.5°C) from August's 75.9°F (24.4°C). During September, Jefferson's temperature averages to a moderate 58.6°F (14.8°C) at night.Humidity
July through September, with an average relative humidity of 78%, are the least humid months.Rainfall
In Jefferson, in September, it is raining for 16.7 days, with typically 2.64" (67mm) of accumulated precipitation. Throughout the year, there are 181 rainfall days, and 36.34" (923mm) of precipitation is accumulated.Snowfall
In Jefferson, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September in Jefferson, sunrise is at 6:49 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:05 pm EDT.
Sunshine
The average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 4 in September translates into these instructions:
Take necessary precautions - Defending against sun damage is advocated. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Jefferson, OH
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in September
Jefferson, OH
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Jefferson, OH
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is January (11.4mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).
Average humidity in September
Jefferson, OH
- Average humidity in September: 78%
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are July, August and September (78%).
Average rainfall in September
Jefferson, OH
- Average rainfall in September: 2.64"
The wettest month (with the highest rainfall) is June (3.94").
The driest months (with the least rainfall) are February and November (2.4").
Average rainfall days in September
Jefferson, OH
- Average rainfall days in September: 16.7 days
The month with the highest number of rainy days is August (18.8 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in September
Jefferson, OH
- Average snowfall in September: 0"
The month with the highest snowfall is January (6.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Jefferson, OH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Jefferson, OH
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).
Average sunshine days in September
Jefferson, OH
- Average sunshine days in September: 11 days
The month with the most sunshine days is September (11 days).
The month with the least sunshine days is January (5.9 days).
Average UV index in September
Jefferson, OH
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Jefferson, OH
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Jefferson, OH
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
