September weather forecast and climate
Fort Atkinson, IA

Weather in September

The first month of the autumn, September, is still a pleasant month in Fort Atkinson, Iowa, with average temperature ranging between min 52°F (11.1°C) and max 70.7°F (21.5°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 77.2°F (25.1°C) in August, to a pleasant 70.7°F (21.5°C). In Fort Atkinson, the average low-temperature is 52°F (11.1°C).

Humidity

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

Rainfall

In Fort Atkinson, Iowa, in September, 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.

Daylight

In Fort Atkinson, the average length of the day is 12.5h.

Sunshine

In Fort Atkinson, the average sunshine is 8.9h.

UV index

The average daily maximum UV index in Fort Atkinson is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Fort Atkinson?

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

How many days does it rain in September in Fort Atkinson?

In Fort Atkinson, Iowa, during September, the rain falls for 13.3 days and regularly aggregates up to 2.48" (63mm) of precipitation.

When it does not snow in Fort Atkinson?

June through September are months without snowfall.

Does it snow in Fort Atkinson in September?

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

How many hours of daylight does Fort Atkinson have in September?

In September, the average length of the day is 12.5h.

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

The average sunshine in September in Fort Atkinson is 8.9h.

What is the UV index reading in September in Fort Atkinson?

In Fort Atkinson, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Fort Atkinson, IA

Average temperature in September - Fort Atkinson, IA
  • Average high temperature in September: 21.5°C

The warmest month (with the highest average high temperature) is July (25.8°C).
The month with the lowest average high temperature is January (-5.4°C).

  • Average low temperature in September: 11.1°C

The month with the highest average low temperature is July (16.6°C).
The coldest month (with the lowest average low temperature) is January (-12.4°C).

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Average pressure in September
Fort Atkinson, IA

Average pressure in September - Fort Atkinson, IA
  • Average pressure in September: 1016.5mbar

The month with the highest atmospheric pressure is January (1020.4mbar).
The month with the lowest atmospheric pressure is June (1012.2mbar).

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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: 13km/h

The windiest month (with the highest average wind speed) is April (16.7km/h).
The calmest month (with the lowest average wind speed) is August (11.3km/h).

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Average humidity in September
Fort Atkinson, IA

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

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: 63mm

The wettest month (with the highest rainfall) is June (128mm).
The driest month (with the least rainfall) is January (28mm).

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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

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: 0mm

The month with the highest snowfall is February (152mm).
Months with the least snowfall are June, July, August and September (0mm).

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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).
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: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 8.9h

The month with the most sunshine is August (Average sunshine: 9.8h).
The month with the least sunshine is January (Average sunshine: 3.5h).

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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

Months with the highest UV index are May, June, July and August (UV index 5).
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: 9km

Months with the highest visibility are March, April, May, June, August, September, October and November (9km).
Months with the lowest visibility are January, February, July and December (8km).

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