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 minor shift in the average high-temperature, adjusting from 82°F (27.8°C) in August to a still moderately hot 75.9°F (24.4°C). Corydon experiences a nighttime temperature average of 56.5°F (13.6°C) during September.Humidity
The average relative humidity in September in Corydon is 77%.Rainfall
In September, in Corydon, the rain falls for 11 days. Throughout September, 2.13" (54mm) of precipitation is accumulated. Throughout the year, there are 125.7 rainfall days, and 20.39" (518mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Corydon.Daylight
In Corydon, Iowa, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:41 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:56 pm CDT.
Sunshine
In September, the average sunshine in Corydon is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 4 during September leads to these advisories:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
What is the temperature in September in Corydon?
What is the average humidity in September in Corydon?
How many days does it rain in September in Corydon?
When it does not snow in Corydon?
Does it snow in Corydon in September?
How many hours of daylight does Corydon have in September?
When is the sunrise / sunset in September in Corydon?
How many hours of sunshine does Corydon have in September?
How high is the UV index in September in Corydon?
Average temperature in September
Corydon, IA
- Average high temperature in September: 75.9°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (30°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in September
Corydon, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Corydon, IA
- Average wind speed in September: 8mph
The windiest months (with the highest average wind speed) are January and March (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Corydon, IA
- Average humidity in September: 77%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Corydon, IA
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is June (3.31").
The driest months (with the least rainfall) are January and December (0.71").
Average rainfall days in September
Corydon, IA
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in September
Corydon, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Corydon, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Corydon, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Corydon, IA
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in September
Corydon, IA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Corydon, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July, August and September (Cloud cover 29).
Average visibility in September
Corydon, 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).
Corydon, Iowa, USA
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