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
Lake Mills marks the onset of September with an average high-temperature of a pleasant 71.6°F (22°C), a subtle shift from August's 76.6°F (24.8°C). In September, Lake Mills experiences an average nighttime temperature of 53.1°F (11.7°C).Humidity
The average relative humidity in September is 78%.Rainfall
In Lake Mills, during September, the rain falls for 12.5 days and regularly aggregates up to 2.56" (65mm) of precipitation. Throughout the year, there are 138.3 rainfall days, and 28.15" (715mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 29min.On the first day of September, sunrise is at 6:38 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:56 pm CDT.
Sunshine
In Lake Mills, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The UV index of 4 during September leads to these advisories:
Exercise caution. Those with pale skin may experience burns in less than half an hour. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Lake Mills have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Lake Mills, IA
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (21.7°F).
- Average low temperature in September: 53.1°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure in September
Lake Mills, 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
Lake Mills, IA
- Average wind speed in September: 8.7mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.5mph).
Average humidity in September
Lake Mills, IA
- Average humidity in September: 78%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Lake Mills, IA
- Average rainfall in September: 2.56"
The wettest month (with the highest rainfall) is June (4.41").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in September
Lake Mills, IA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is June (19.4 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Lake Mills, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (7.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lake Mills, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lake Mills, IA
- Average daylight in September: 12h and 3min
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: 8h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Lake Mills, IA
- Average sunshine days in September: 15 days
The month with the most sunshine days is October (16.7 days).
The month with the least sunshine days is June (9.1 days).
Average UV index in September
Lake Mills, 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, November and December (UV index 1).
Average cloud cover in September
Lake Mills, IA
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Lake Mills, IA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, September, October and November (6mi).
The months with the lowest visibility are January, February, July, August and December (5mi).
Lake Mills, Iowa, USA
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