September weather forecastOkoboji, IA
September
Weather in September
September, the first month of the autumn in Okoboji, is still a pleasant month, with temperature in the range of an average low of 53.6°F (12°C) and an average high of 72.5°F (22.5°C).Temperature
The shift from August to September includes a small decrease in the average high-temperature, from a moderately hot 78.3°F (25.7°C) to an agreeable 72.5°F (22.5°C). During September nights, Okoboji records an average temperature of 53.6°F (12°C).Humidity
In September, the average relative humidity in Okoboji is 74%.Rainfall
In September, the rain falls for 11.5 days. Throughout September, 2.13" (54mm) of precipitation is accumulated. In Okoboji, Iowa, during the entire year, the rain falls for 124.6 days and collects up to 24.37" (619mm) of precipitation.Snowfall
In Okoboji, snow does not fall in June through September.Daylight
The average length of the day in September in Okoboji is 12h and 29min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:55 pm. On the last day of September, sunrise is at 7:17 am and sunset at 7:02 pm CDT.
Sunshine
In September, the average sunshine is 9h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Okoboji, IA
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure in September
Okoboji, IA
- Average pressure in September: 30"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
Okoboji, IA
- Average wind speed in September: 9.1mph
The windiest months (with the highest average wind speed) are January, February and April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Okoboji, IA
- Average humidity in September: 74%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
Okoboji, IA
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is June (3.9").
The driest month (with the least rainfall) is January (0.83").
Average rainfall days in September
Okoboji, IA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is February (2.1 days).
Average snowfall in September
Okoboji, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.47").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Okoboji, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (10.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Okoboji, IA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Okoboji, IA
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is June (8.6 days).
Average UV index in September
Okoboji, 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, February and November (UV index 1).
Average cloud cover in September
Okoboji, IA
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Okoboji, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
