September weather forecast
Fort Atkinson, IA

Weather in September

September, the first month of the autumn in Fort Atkinson, is also an agreeable month, with an average temperature fluctuating between 52°F (11.1°C) and 70.7°F (21.5°C).

Temperature

In September, the average high-temperature marginally drops from a moderately hot 77.2°F (25.1°C) in August to a pleasant 70.7°F (21.5°C). In September, the average low-temperature is 52°F (11.1°C).

Humidity

In Fort Atkinson, the average relative humidity in September is 80%.

Rainfall

In Fort Atkinson, during 13.3 rainfall days, 2.48" (63mm) of precipitation is typically accumulated. Throughout the year, there are 149 rainfall days, and 30.59" (777mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Fort Atkinson.

Daylight

In September, the average length of the day in Fort Atkinson is 12h and 29min.
On the first day of September in Fort Atkinson, sunrise is at 6:32 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:51 pm CDT.

Sunshine

In September, the average sunshine is 8.9h.

UV index

In September, the average daily maximum UV index in Fort Atkinson is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Fort Atkinson?

In Fort Atkinson, Iowa, the average relative humidity in September is 80%.

How much does it rain in Fort Atkinson in September?

In Fort Atkinson, Iowa, in September, during 13.3 rainfall days, 2.48" (63mm) of precipitation is typically accumulated.

When it does not snow in Fort Atkinson?

June through September are months without snowfall in Fort Atkinson, Iowa.

Does it snow in Fort Atkinson in September?

In Fort Atkinson, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Fort Atkinson?

The average day length in September is 12h and 29min.

When are sunrise and sunset in September in Fort Atkinson?

On the first day of September, sunrise is at 6:32 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:51 pm CDT.

How long on average sun shines in September in Fort Atkinson?

In September, the average sunshine duration in Fort Atkinson, Iowa, is 8.9h.

How high is the UV index in September in Fort Atkinson?

In September, the average daily maximum UV index in Fort Atkinson is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Fort Atkinson, IA

Average temperature in September - Fort Atkinson, IA
  • Average high temperature in September: 70.7°F

The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (22.3°F).

  • Average low temperature in September: 52°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).

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Average pressure in September
Fort Atkinson, IA

Average pressure in September - Fort Atkinson, IA
  • Average pressure in September: 30.02"Hg

The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in September
Fort Atkinson, IA

Average wind speed in September - Fort Atkinson, IA
  • Average wind speed in September: 8.1mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in September
Fort Atkinson, IA

Average humidity in September - Fort Atkinson, IA
  • Average humidity in September: 80%

The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is October (76%).

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Average rainfall in September
Fort Atkinson, IA

Average rainfall in September - Fort Atkinson, IA
  • Average rainfall in September: 2.48"

The wettest month (with the highest rainfall) is June (5.04").
The driest month (with the least rainfall) is January (1.1").

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Average rainfall days in September
Fort Atkinson, IA

Average rainfall days in September - Fort Atkinson, IA
  • Average rainfall days in September: 13.3 days

The months with the highest number of rainy days are May and June (20.3 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in September
Fort Atkinson, IA

Average snowfall in September - Fort Atkinson, IA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Fort Atkinson, IA

Average snowfall days in September - Fort Atkinson, IA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Fort Atkinson, IA

Average daylight in September / Average sunshine in September - Fort Atkinson, IA
  • Average daylight in September: 12h and 29min

The month with the longest days is June (Average daylight: 15h and 19min).
The month with the shortest days is December (Average daylight: 9h and 3min).

  • Average sunshine in September: 8h and 54min

The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days in September
Fort Atkinson, IA

Average sunshine days in September - Fort Atkinson, IA
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is June (7.1 days).

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Average UV index in September
Fort Atkinson, IA

Average UV index in September - Fort Atkinson, IA
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in September
Fort Atkinson, IA

Average cloud cover in September - Fort Atkinson, IA
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Fort Atkinson, IA

Average visibility in September - Fort Atkinson, IA
  • Average visibility in September: 6mi

The months with the highest visibility are March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, July and December (5mi).

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