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
Duncombe records an average high-temperature of a still warm 74.3°F (23.5°C) in September, closely mirroring the climate of the previous month. An average temperature of 54.9°F (12.7°C) is recorded during the nights in September.Humidity
In Duncombe, the average relative humidity in September is 76%.Rainfall
In September, the rain falls for 12.4 days. Throughout September, 2.6" (66mm) of precipitation is accumulated. In Duncombe, during the entire year, the rain falls for 135.2 days and collects up to 26.5" (673mm) of precipitation.Snowfall
In Duncombe, 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 6:41 am and sunset at 7:49 pm. On the last day of September, in Duncombe, sunrise is at 7:12 am and sunset at 6:58 pm CDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Duncombe in September?
What is the average humidity in September in Duncombe?
How many days does it rain in September in Duncombe?
When it does not snow in Duncombe?
Does it snow in Duncombe in September?
What is the average length of the day in September in Duncombe?
When is the sunrise / sunset in September in Duncombe?
How many hours of sunshine does Duncombe have in September?
What is the UV index intensity in September in Duncombe?
Average temperature in September
Duncombe, IA
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in September
Duncombe, IA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Duncombe, IA
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is April (11mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in September
Duncombe, IA
- Average humidity in September: 76%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (69%).
Average rainfall in September
Duncombe, IA
- Average rainfall in September: 2.6"
The wettest month (with the highest rainfall) is June (4.02").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in September
Duncombe, IA
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is June (18.1 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in September
Duncombe, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.65").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Duncombe, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Duncombe, 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 6min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Duncombe, IA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in September
Duncombe, IA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Duncombe, IA
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility in September
Duncombe, 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).
Duncombe, Iowa, USA
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