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
Dayton's shift into September is marked by a subtle change to a still moderately hot 75°F (23.9°C) from August's 79.9°F (26.6°C) in temperature. September sees the temperature falling to a mean low of 57.2°F (14°C).Humidity
In September, the average relative humidity is 78%.Rainfall
In Dayton, in September, during 14 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. Throughout the year, in Dayton, there are 161.4 rainfall days, and 26.89" (683mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Dayton, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 7:15 am and sunset at 8:18 pm. On the last day of September, sunrise is at 7:43 am and sunset at 7:30 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 5 during September leads to these instructions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Dayton have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Dayton have in September?
What is the UV index intensity in September?
Average temperature in September
Dayton, IN
- Average high temperature in September: 75°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.8°F).
- Average low temperature in September: 57.2°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Dayton, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Dayton, IN
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Dayton, IN
- Average humidity in September: 78%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Dayton, IN
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is April (3.43").
The driest month (with the least rainfall) is February (1.54").
Average rainfall days in September
Dayton, IN
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is May (19.4 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in September
Dayton, IN
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.03").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Dayton, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dayton, IN
- Average daylight in September: 12h and 2min
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 2min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Dayton, IN
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is November (17.5 days).
The months with the least sunshine days are May and July (9.3 days).
Average UV index in September
Dayton, IN
- Average UV index in September: 5
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, October, November and December (UV index 2).
Average cloud cover in September
Dayton, IN
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are June, July, August and September (Cloud cover 33).
Average visibility in September
Dayton, IN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Dayton, Indiana, USA
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