September weather forecast
Fort Madison, IA

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Weather in September

In September, the city of Fort Madison transitions to Autumn with a noticeable dip in temperature. The humidity levels drop, offering the residents the first signs of relief after the prolonged summer heat. The duration of sunlight reduces, and the leaves start changing colors, making the surroundings picturesque. Wind speed increases slightly, contributing to the pleasant weather parameters. A more significant cooldown is rendered, with temperatures now oscillating between 57.4°F (14.1°C) and 77°F (25°C).

Temperature

September's onset records a minor alteration in the average high-temperature to a still moderately hot 77°F (25°C) from August's 82.2°F (27.9°C). An average nighttime temperature of 57.4°F (14.1°C) is noted in Fort Madison, Iowa, during the month of September.

Humidity

The average relative humidity in September in Fort Madison is 74%.

Rainfall

In Fort Madison, during September, the rain falls for 8.2 days and regularly aggregates up to 0.83" (21mm) of precipitation. In Fort Madison, during the entire year, the rain falls for 101.8 days and collects up to 9.92" (252mm) of precipitation.

Snowfall

In Fort Madison, Iowa, snow does not fall in May through September.

Daylight

In Fort Madison, the average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:33 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:48 pm CDT.

Sunshine

The average sunshine in September is 9.6h.

UV index

In Fort Madison, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 4 translates into these guidelines:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
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Frequently asked questions

What is the temperature in September in Fort Madison?

An average high-temperature, in September, in Fort Madison, is 77°F (25°C) and the average low-temperature is 57.4°F (14.1°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is estimated at 89.6°F (32°C).

What is the average humidity in September in Fort Madison?

In Fort Madison, the average relative humidity in September is 74%.

How much does it rain in Fort Madison in September?

In Fort Madison, during September, the rain falls for 8.2 days and regularly aggregates up to 0.83" (21mm) of precipitation.

When it does not snow in Fort Madison?

In Fort Madison, snow does not fall in May through September.

Does it snow in Fort Madison in September?

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

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

In September, the average day length is 12h and 27min.

What time are sunrise and sunset in September in Fort Madison?

On the first day of September in Fort Madison, Iowa, sunrise is at 6:33 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:48 pm CDT.

How many hours of sunshine does Fort Madison have in September?

In Fort Madison, Iowa, the average sunshine duration in September is 9.6h.

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

The average daily maximum UV index in September in Fort Madison is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Fort Madison, IA

Average temperature in September - Fort Madison, IA
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (30.4°F).

  • Average low temperature in September: 57.4°F

The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

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Average pressure in September
Fort Madison, IA

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

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in September
Fort Madison, IA

Average wind speed in September - Fort Madison, IA
  • Average wind speed in September: 7.7mph

The windiest months (with the highest average wind speed) are January, February, March and April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).

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Average humidity in September
Fort Madison, IA

Average humidity in September - Fort Madison, IA
  • Average humidity in September: 74%

The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Fort Madison, IA

Average rainfall in September - Fort Madison, IA
  • Average rainfall in September: 0.83"

The wettest month (with the highest rainfall) is May (1.46").
The driest months (with the least rainfall) are January and December (0.47").

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Average rainfall days in September
Fort Madison, IA

Average rainfall days in September - Fort Madison, IA
  • Average rainfall days in September: 8.2 days

The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is February (3.5 days).

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Average snowfall in September
Fort Madison, IA

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

The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Fort Madison, IA

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

The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Fort Madison, IA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

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Average sunshine days in September
Fort Madison, IA

Average sunshine days in September - Fort Madison, IA
  • Average sunshine days in September: 19.4 days

The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is May (14 days).

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Average UV index in September
Fort Madison, IA

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Fort Madison, IA

Average cloud cover in September - Fort Madison, IA
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 28).

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Average visibility in September
Fort Madison, IA

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

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

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Fort Madison, Iowa, USA

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