September weather forecastRoswell, OH
September
Weather in September
The first month of the autumn, September, is still a warm month in Roswell, Ohio, with an average temperature fluctuating between 74.8°F (23.8°C) and 55°F (12.8°C).Temperature
September ushers in a minute temperature change, with average high-temperatures reducing from August's 81.1°F (27.3°C) to a still warm 74.8°F (23.8°C). Throughout September, the nighttime temperature averages to a cool 55°F (12.8°C).Humidity
In September, the average relative humidity is 79%.Rainfall
January and September are months with the least rain when the rain falls for 9.5 days and typically aggregates up to 0.87" (22mm) of rain.Snowfall
June through October are months without snowfall in Roswell.Daylight
In Roswell, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:53 am and sunset at 7:56 pm. On the last day of September, in Roswell, Ohio, sunrise is at 7:21 am and sunset at 7:08 pm EDT.
Sunshine
In September, the average sunshine in Roswell is 8.2h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Roswell, OH
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Roswell, OH
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Roswell, OH
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is January (8.2mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in September
Roswell, OH
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April and July (77%).
Average rainfall in September
Roswell, OH
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is June (1.73").
The driest months (with the least rainfall) are January and September (0.87").
Average rainfall days in September
Roswell, OH
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in September
Roswell, OH
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.73").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Roswell, OH
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (8.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Roswell, 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 18min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Roswell, OH
- Average sunshine days in September: 18 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is May (13.2 days).
Average UV index in September
Roswell, OH
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Roswell, OH
- Average cloud cover in September: 39
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Roswell, 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, February, March, May, June, July, August, September, October and December (5mi).
