September weather forecastDayton, IA
September
Weather in September
The first month of the autumn, September, is still a warm month in Dayton, Iowa, with an average temperature ranging between max 74.8°F (23.8°C) and min 55.9°F (13.3°C).Temperature
The advent of September brings a subtle shift in temperature, with the average high moving from a moderately hot 80.2°F (26.8°C) in August to a still warm 74.8°F (23.8°C). The average temperature drops to a mild 55.9°F (13.3°C) during the night in the month of September.Humidity
The average relative humidity in September is 75%.Rainfall
In Dayton, in September, it is raining for 11.6 days, with typically 3.03" (77mm) of accumulated precipitation. Throughout the year, there are 126.1 rainfall days, and 26.85" (682mm) of precipitation is accumulated.Snowfall
In Dayton, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:42 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:13 am and sunset at 6:58 pm CDT.
Sunshine
In September, the average sunshine is 9.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dayton, IA
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (26.8°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in September
Dayton, IA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Dayton, IA
- Average wind speed in September: 8.2mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7mph).
Average humidity in September
Dayton, IA
- Average humidity in September: 75%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).
Average rainfall in September
Dayton, IA
- Average rainfall in September: 3.03"
The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
Dayton, IA
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is June (16.7 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Dayton, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Dayton, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 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, IA
- 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: 9h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Dayton, IA
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is October (19 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in September
Dayton, IA
- 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, October, November and December (UV index 2).
Average cloud cover in September
Dayton, IA
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are July and September (Cloud cover 31).
Average visibility in September
Dayton, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
