August weather forecast
Fort Madison, IA

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Weather in August

In August, the heat anchor's grip somewhat releases on Fort Madison, though it remains high. The intensity of heat gradually diminishes, laying the ground for the onset of autumn. Longer daylight hours persist, continuing to support outdoor activities. The evening air becomes fresher as nights become slightly cooler than in July. However, heat remains dominant, with temperatures still hovering from 63.9°F (17.7°C) to 82.2°F (27.9°C).

Temperature

Fort Madison records a slight change with August's average high-temperatures adjusting to a still moderately hot 82.2°F (27.9°C) from July's 82.9°F (28.3°C). Throughout August, Fort Madison experiences a low-temperature average of 63.9°F (17.7°C).

Heat index

August's average heat index is estimated at a hot 89.6°F (32°C). Persistent activity under exposure might lead to a feeling of weariness, with subsequent heat cramps.
Know that the heat index computations account for shaded terrains and slight winds. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', marries air temperature and humidity to produce a value illustrating perceived warmth. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Fort Madison, Iowa, the average relative humidity in August is 78%.

Rainfall

In Fort Madison, during August, the rain falls for 9.8 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

May through September are months without snowfall.

Daylight

The average length of the day in August in Fort Madison is 13h and 44min.
On the first day of the month, sunrise is at 6:02 am and sunset at 8:20 pm. On the last day of August, sunrise is at 6:32 am and sunset at 7:38 pm CDT.

Sunshine

In Fort Madison, the average sunshine in August is 10.1h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.
Note: During August, 6 as the daily maximum UV index converts into the following advice:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. 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 August in Fort Madison?

In August, the average high-temperature and low-temperature in Fort Madison, Iowa, are 82.2°F (27.9°C) and 63.9°F (17.7°C) respectively. 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 August in Fort Madison?

In August, the average relative humidity in Fort Madison is 78%.

How much does it rain in Fort Madison in August?

In Fort Madison, during August, the rain falls for 9.8 days and regularly aggregates up to 0.83" (21mm) of precipitation.

When it does not snow in Fort Madison?

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

What is the average length of the day in August in Fort Madison?

The average day length in August is 13h and 44min.

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

In August, on the first day of the month, sunrise is at 6:02 am and sunset at 8:20 pm. On the last day of the month, in Fort Madison, Iowa, sunrise is at 6:32 am and sunset at 7:38 pm CDT.

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

In Fort Madison, the average sunshine duration in August is 10.1h.

When is the highest UV index in Fort Madison?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the UV index intensity in August in Fort Madison?

The average daily maximum UV index in August is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to UV radiation.
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 August
Fort Madison, IA

Average temperature in August - Fort Madison, IA
  • Average high temperature in August: 82.2°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 August: 63.9°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 August
Fort Madison, IA

Average pressure in August - Fort Madison, IA
  • Average pressure in August: 29.97"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 August
Fort Madison, IA

Average wind speed in August - Fort Madison, IA
  • Average wind speed in August: 6.7mph

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 August
Fort Madison, IA

Average humidity in August - Fort Madison, IA
  • Average humidity in August: 78%

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 August
Fort Madison, IA

Average rainfall in August - Fort Madison, IA
  • Average rainfall in August: 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 August
Fort Madison, IA

Average rainfall days in August - Fort Madison, IA
  • Average rainfall days in August: 9.8 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 August
Fort Madison, IA

Average snowfall in August - Fort Madison, IA
  • Average snowfall in August: 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 August
Fort Madison, IA

Average snowfall days in August - Fort Madison, IA
  • Average snowfall days in August: 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 August /
Average sunshine in August
Fort Madison, IA

Average daylight in August / Average sunshine in August - Fort Madison, IA
  • Average daylight in August: 13h and 4min

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 August: 10h and 1min

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 August
Fort Madison, IA

Average sunshine days in August - Fort Madison, IA
  • Average sunshine days in August: 17.6 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 August
Fort Madison, IA

Average UV index in August - Fort Madison, IA
  • Average UV index in August: 6

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 August
Fort Madison, IA

Average cloud cover in August - Fort Madison, IA
  • Average cloud cover in August: 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 August
Fort Madison, IA

Average visibility in August - Fort Madison, IA
  • Average visibility in August: 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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