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
The onset of September entails a subtle temperature shift, as the average high-temperature eases from a moderately hot 78.6°F (25.9°C) in August to a pleasant 72.7°F (22.6°C). Throughout September, the nighttime temperature averages to a fresh 54.1°F (12.3°C).Humidity
The average relative humidity in September in Dunkerton is 79%.Rainfall
In Dunkerton, during September, the rain falls for 12.1 days and regularly aggregates up to 2.64" (67mm) of precipitation. In Dunkerton, during the entire year, the rain falls for 143.2 days and collects up to 31.02" (788mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:42 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:51 pm CDT.
Sunshine
The average sunshine in September in Dunkerton is 9h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Dunkerton in September?
What is the average humidity in September in Dunkerton?
How many days does it rain in September in Dunkerton?
When it does not snow in Dunkerton?
Does it snow in Dunkerton in September?
What is the average length of the day in September in Dunkerton?
When is the sunrise / sunset in September in Dunkerton?
How many hours of sunshine does Dunkerton have in September?
What is the UV index intensity in September in Dunkerton?
Average temperature in September
Dunkerton, IA
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in September
Dunkerton, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Dunkerton, IA
- Average wind speed in September: 8.2mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Dunkerton, IA
- Average humidity in September: 79%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Dunkerton, IA
- Average rainfall in September: 2.64"
The wettest month (with the highest rainfall) is June (4.88").
The driest months (with the least rainfall) are January and February (1.14").
Average rainfall days in September
Dunkerton, IA
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is June (19.6 days).
The month with the least rainy days is February (3.7 days).
Average snowfall in September
Dunkerton, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Dunkerton, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dunkerton, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Dunkerton, IA
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is October (17.4 days).
The month with the least sunshine days is June (7.8 days).
Average UV index in September
Dunkerton, IA
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Dunkerton, IA
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in September
Dunkerton, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Dunkerton, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location