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 the average high-temperature, shifting from a warm 81.5°F (27.5°C) in August to a still moderately hot 75.6°F (24.2°C). In Dunlap, the average low-temperature during the month of September is a moderate 56.3°F (13.5°C).Humidity
The average relative humidity in September is 73%.Rainfall
In Dunlap, during September, the rain falls for 11.7 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, there are 120.4 rainfall days, and 19.88" (505mm) of precipitation is accumulated.Snowfall
In Dunlap, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:55 pm. On the last day of September, sunrise is at 7:19 am and sunset at 7:05 pm CDT.
Sunshine
In September, the average sunshine is 9.2h.UV index
In Dunlap, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
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 Dunlap have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Dunlap have in September?
What is the UV index intensity in September?
Average temperature in September
Dunlap, IA
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in September
Dunlap, IA
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Dunlap, IA
- Average wind speed in September: 8.6mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in September
Dunlap, IA
- Average humidity in September: 73%
The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are April and October (67%).
Average rainfall in September
Dunlap, IA
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is May (3.27").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in September
Dunlap, IA
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is June (16.3 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in September
Dunlap, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.56").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Dunlap, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dunlap, IA
- Average daylight in September: 12h and 3min
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 1min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in September
Dunlap, IA
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is December (21.7 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in September
Dunlap, IA
- Average UV index in September: 4
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
Dunlap, IA
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Dunlap, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Dunlap, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location