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 brings a slight decrease in temperature, down from 82°F (27.8°C) in August to a still warm 75.4°F (24.1°C). Dayton reports an average low-temperature of 54.5°F (12.5°C) during the nights of September.Humidity
May, September and October, with an average relative humidity of 78%, are the most humid months.Rainfall
In Dayton, in September, during 14.5 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Dayton, during the entire year, the rain falls for 167.3 days and collects up to 30.35" (771mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Dayton, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:11 am and sunset at 6:59 pm EDT.
Sunshine
The average sunshine in September in Dayton is 8.5h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Frequently asked questions
What are September temperatures in Dayton?
What is the most humid month in Dayton?
What is the average humidity in September in Dayton?
How many days does it rain in September in Dayton?
When it does not snow in Dayton?
Does it snow in Dayton in September?
What is the average length of the day in September in Dayton?
When are sunrise and sunset in September in Dayton?
How many hours of sunshine does Dayton have in September?
How high is the UV index in September in Dayton?
Average temperature in September
Dayton, VA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Dayton, VA
- Average pressure in September: 30.06"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
Dayton, VA
- Average wind speed in September: 4.5mph
The windiest months (with the highest average wind speed) are February and April (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Dayton, VA
- Average humidity in September: 78%
The months with the highest relative humidity are May, September and October (78%).
The months with the lowest relative humidity are January and July (74%).
Average rainfall in September
Dayton, VA
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is May (3.46").
The driest month (with the least rainfall) is November (1.77").
Average rainfall days in September
Dayton, VA
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is November (9 days).
Average snowfall in September
Dayton, VA
- Average snowfall in September: 0"
The month with the highest snowfall is March (4.45").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Dayton, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dayton, VA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Dayton, VA
- Average sunshine days in September: 12.3 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (9.9 days).
Average UV index in September
Dayton, VA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Dayton, VA
- Average cloud cover in September: 39
The month with the most cloud cover is March (Cloud cover 46).
The months with the least cloud cover are June and July (Cloud cover 32).
Average visibility in September
Dayton, VA
- Average visibility in September: 5mi
The months with the highest visibility are February, April, June, July and November (6mi).
The months with the lowest visibility are January, March, May, August, September, October and December (5mi).
Dayton, Virginia, USA
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