August weather forecast
Iowa City, IA

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Golden and brown trees in a scenic, neat lawn near the mighty grandeur of the Old Capitol building, Iowa City
Golden and brown trees in a scenic, neat lawn near the mighty grandeur of the Old Capitol building, Iowa City

Weather in August

August witnesses a slight drop in temperature, though the weather continues to stay firmly within the summer category. Residents enjoy moderate balance between warmth and rainfall, thereby fostering enticing days for outdoor recreation. The long daylight hours provide ample viewing time for the city's attractions, complemented by less dense cloud coverage.

Temperature

The average high-temperature in Iowa City, Iowa, during August is a still warm 80.6°F (27°C), almost matching the conditions of the preceding month. Iowa City records a mean low-temperature of 62.2°F (16.8°C) in August.

Heat index

For most parts of August, the heat index is estimated at a tropical 86°F (30°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
The standards for the heat index are set for locations in shade and under light breezes. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', joins air temperature with relative humidity to produce a temperature perception for humans. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.

Humidity

The average relative humidity in August in Iowa City is 79%.

Rainfall

In August, in Iowa City, Iowa, the rain falls for 12.8 days. Throughout August, 1.93" (49mm) of precipitation is accumulated. In Iowa City, during the entire year, the rain falls for 140.4 days and collects up to 29.57" (751mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in August in Iowa City, Iowa, is 13h and 48min.
On the first day of August in Iowa City, sunrise is at 6:01 am and sunset at 8:23 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 7:40 pm CDT.

Sunshine

The average sunshine in August is 9.9h.

UV index

In August, the average daily maximum UV index in Iowa City is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In August, a daily maximum UV index of 5 leads to the following instructions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
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Frequently asked questions

What are the temperatures in Iowa City in August?

In Iowa City, in August, the average high-temperature is 80.6°F (27°C), and the average low-temperature is 62.2°F (16.8°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is estimated at 86°F (30°C).

What is the average humidity in August in Iowa City?

The average relative humidity in August in Iowa City is 79%.

How many days does it rain in August in Iowa City?

In August, in Iowa City, the rain falls for 12.8 days. Throughout August, 1.93" (49mm) of precipitation is accumulated.

When it does not snow in Iowa City?

May through September are months without snowfall.

What is the average length of the day in August in Iowa City?

In August, the average day length in Iowa City, Iowa, is 13h and 48min.

When is the sunrise / sunset in August in Iowa City?

In August, on the first day of the month, sunrise is at 6:01 am and sunset at 8:23 pm. On the last day of the month, in Iowa City, Iowa, sunrise is at 6:31 am and sunset at 7:40 pm CDT.

How many hours of sunshine does Iowa City have in August?

The average sunshine duration in August in Iowa City is 9.9h.

How high is the UV index in August in Iowa City?

The average daily maximum UV index in August in Iowa City, Iowa, is 5. A UV Index reading of 3 to 5 represents a medium 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
Iowa City, IA

Average temperature in August - Iowa City, IA
  • Average high temperature in August: 80.6°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in August: 62.2°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).

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Average pressure in August
Iowa City, IA

Average pressure in August - Iowa City, IA
  • Average pressure in August: 29.97"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in August
Iowa City, IA

Average wind speed in August - Iowa City, IA
  • Average wind speed in August: 6.9mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

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Average humidity in August
Iowa City, IA

Average humidity in August - Iowa City, IA
  • Average humidity in August: 79%

The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in August
Iowa City, IA

Average rainfall in August - Iowa City, IA
  • Average rainfall in August: 1.93"

The wettest month (with the highest rainfall) is May (4.69").
The driest months (with the least rainfall) are January and February (1.34").

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Average rainfall days in August
Iowa City, IA

Average rainfall days in August - Iowa City, IA
  • Average rainfall days in August: 12.8 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5 days).

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Average snowfall in August
Iowa City, IA

Average snowfall in August - Iowa City, IA
  • Average snowfall in August: 0"

The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in August
Iowa City, IA

Average snowfall days in August - Iowa City, IA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (10.9 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
Iowa City, IA

Average daylight in August / Average sunshine in August - Iowa City, IA
  • Average daylight in August: 13h and 5min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in August: 9h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

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Average sunshine days in August
Iowa City, IA

Average sunshine days in August - Iowa City, IA
  • Average sunshine days in August: 15.8 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10 days).

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Average UV index in August
Iowa City, IA

Average UV index in August - Iowa City, IA
  • Average UV index in August: 5

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in August
Iowa City, IA

Average cloud cover in August - Iowa City, IA
  • Average cloud cover in August: 29

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in August
Iowa City, IA

Average visibility in August - Iowa City, IA
  • Average visibility in August: 6mi

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

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Iowa City, Iowa, USA

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