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 to September in Storm Lake signals an average high-temperature of a still moderately hot 73.9°F (23.3°C), subtly varied from August's 79°F (26.1°C). During September, Storm Lake witnesses a consistent average low-temperature of 55.2°F (12.9°C).Humidity
The average relative humidity in September in Storm Lake is 74%.Rainfall
In Storm Lake, Iowa, in September, it is raining for 12.5 days, with typically 2.32" (59mm) of accumulated precipitation. In Storm Lake, during the entire year, the rain falls for 135.1 days and collects up to 26.73" (679mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Storm Lake, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:46 am and sunset at 7:54 pm. On the last day of September, in Storm Lake, sunrise is at 7:17 am and sunset at 7:03 pm CDT.
Sunshine
In Storm Lake, the average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September in Storm Lake is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Guard yourself - Avoiding sunburn is suggested. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Storm Lake?
What is the average humidity in September in Storm Lake?
How many days does it rain in September in Storm Lake?
When it does not snow in Storm Lake?
Does it snow in Storm Lake in September?
How many hours of daylight does Storm Lake have in September?
When is the sunrise / sunset in September in Storm Lake?
How many hours of sunshine does Storm Lake have in September?
What is the UV index reading in September in Storm Lake?
Average temperature in September
Storm Lake, IA
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (24.6°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in September
Storm Lake, 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
Storm Lake, IA
- Average wind speed in September: 8.8mph
The windiest months (with the highest average wind speed) are January and April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in September
Storm Lake, IA
- Average humidity in September: 74%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are April and October (68%).
Average rainfall in September
Storm Lake, IA
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is June (4.02").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
Storm Lake, IA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is June (19 days).
The month with the least rainy days is February (3.7 days).
Average snowfall in September
Storm Lake, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.79").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Storm Lake, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Storm Lake, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Storm Lake, IA
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is June (8.1 days).
Average UV index in September
Storm Lake, 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 February (UV index 1).
Average cloud cover in September
Storm Lake, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Storm Lake, 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).
Storm Lake, Iowa, USA
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