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 shift from August to September coincides with a small decrease in the average high-temperature, down to a still warm 75.7°F (24.3°C) from a moderately hot 81.1°F (27.3°C). An average nighttime temperature of 56.3°F (13.5°C) is observed in Cotter during September.Humidity
In September, the average relative humidity in Cotter, Iowa, is 76%.Rainfall
In Cotter, in September, it is raining for 6.7 days, with typically 0.59" (15mm) of accumulated precipitation. In Cotter, during the entire year, the rain falls for 81.9 days and collects up to 6.69" (170mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day in Cotter is 12h and 28min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:48 pm CDT.
Sunshine
The average sunshine in September is 9.5h.UV index
In September, the average daily maximum UV index in Cotter is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Cotter in September?
What is the average humidity in September in Cotter?
How much does it rain in Cotter in September?
When it does not snow in Cotter?
Does it snow in Cotter in September?
How many hours of daylight does Cotter have in September?
What time are sunrise and sunset in September in Cotter?
How long on average sun shines in September in Cotter?
What is the UV index reading in September in Cotter?
Average temperature in September
Cotter, IA
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in September
Cotter, 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 (29.9"Hg).
Average wind speed in September
Cotter, IA
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Cotter, IA
- Average humidity in September: 76%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Cotter, IA
- Average rainfall in September: 0.59"
The wettest month (with the highest rainfall) is May (1.1").
The driest months (with the least rainfall) are February and December (0.28").
Average rainfall days in September
Cotter, IA
- Average rainfall days in September: 6.7 days
The month with the highest number of rainy days is June (11 days).
The month with the least rainy days is January (3 days).
Average snowfall in September
Cotter, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.02").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Cotter, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Cotter, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The months with the least sunshine are January and February (Average sunshine: 4h and 18min).
Average sunshine days in September
Cotter, IA
- Average sunshine days in September: 20.9 days
The month with the most sunshine days is December (25.3 days).
The month with the least sunshine days is June (14.8 days).
Average UV index in September
Cotter, 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 and December (UV index 1).
Average cloud cover in September
Cotter, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Cotter, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Cotter, Iowa, USA
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