August weather forecast
Decatur City, IA

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Weather in August

August, the last month of the summer in Decatur City, is another warm month, with an average temperature varying between 63.5°F (17.5°C) and 81.9°F (27.7°C).

Temperature

The advent of August reveals an average high-temperature of a still warm 81.9°F (27.7°C), showing minimal difference from the prior month. An average nighttime temperature of 63.5°F (17.5°C) is recorded during August.

Heat index

August's heat index is calculated to be a tropical 87.8°F (31°C). Enduring exposure and continuous activity might cause a feeling of tiredness and induce heat cramps.
When assessing, remember that heat index measurements are for light winds and shaded spots. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.

Humidity

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

Rainfall

In Decatur City, in August, it is raining for 13.3 days, with typically 1.93" (49mm) of accumulated precipitation. In Decatur City, during the entire year, the rain falls for 132.4 days and collects up to 20.24" (514mm) of precipitation.

Snowfall

In Decatur City, snow does not fall in June through September.

Daylight

The average length of the day in August is 13h and 44min.
On the first day of August, sunrise is at 6:12 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 7:48 pm CDT.

Sunshine

In Decatur City, the average sunshine in August is 10h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 6 during August leads to these advisories:
Take precautions against overexposure. Protection against sun damage is needed. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average August temperature?

In August, in Decatur City, the average high-temperature is 81.9°F (27.7°C), and the average low-temperature is 63.5°F (17.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, in August is calculated to be 87.8°F (31°C).

What is the average humidity in August?

In Decatur City, the average relative humidity in August is 79%.

How much does it rain in August?

In Decatur City, during August, the rain falls for 13.3 days and regularly aggregates up to 1.93" (49mm) of precipitation.

When it does not snow?

June through September are months without snowfall in Decatur City.

How many hours of daylight does Decatur City have in August?

In August, the average day length is 13h and 44min.

What time are sunrise and sunset in August?

In August, on the first day of the month, sunrise is at 6:12 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 7:48 pm CDT.

How long on average sun shines in August?

In August, the average sunshine duration is 10h.

What are the months with the highest UV index?

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

What is the UV index reading in August in Decatur City?

In Decatur City, the average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe 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 August
Decatur City, IA

Average temperature in August - Decatur City, IA
  • Average high temperature in August: 81.9°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in August: 63.5°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

Average pressure in August
Decatur City, IA

Average pressure in August - Decatur City, IA
  • Average pressure in August: 29.96"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in August
Decatur City, IA

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

The windiest months (with the highest average wind speed) are January, February and March (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

Average humidity in August
Decatur City, IA

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

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).

Average rainfall in August
Decatur City, IA

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

The wettest month (with the highest rainfall) is June (3.43").
The driest months (with the least rainfall) are January and December (0.67").

Average rainfall days in August
Decatur City, IA

Average rainfall days in August - Decatur City, IA
  • Average rainfall days in August: 13.3 days

The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is January (4.8 days).

Average snowfall in August
Decatur City, IA

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

The month with the highest snowfall is January (2.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in August
Decatur City, IA

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

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in August /
Average sunshine in August
Decatur City, IA

Average daylight in August / Average sunshine in August - Decatur City, 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 0min

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 24min).

Average sunshine days in August
Decatur City, IA

Average sunshine days in August - Decatur City, IA
  • Average sunshine days in August: 13.8 days

The month with the most sunshine days is December (20.3 days).
The month with the least sunshine days is June (8.9 days).

Average UV index in August
Decatur City, IA

Average UV index in August - Decatur City, IA
  • Average UV index in August: 6

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

Average cloud cover in August
Decatur City, IA

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

The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in August
Decatur City, IA

Average visibility in August - Decatur City, 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).

Decatur City, Iowa, USA

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