August weather forecast and climate
Marion, IL

Weather in August

August, the last month of the summer, in Marion, is also a moderately hot month, with temperature in the range of an average low of 66.4°F (19.1°C) and an average high of 85.6°F (29.8°C).

Temperature

In Marion, the average high-temperature in August is almost the same as in July - a moderately hot 85.6°F (29.8°C). The average low-temperature,, is 66.4°F (19.1°C).

Heat index

The average heat index is calculated to be a sweltering 96.8°F (36°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in August is 76%.

Rainfall

In Marion, it is raining for 13.5 days, with typically 1.89" (48mm) of accumulated precipitation. In Marion, during the entire year, the rain falls for 137.6 days and collects up to 23.03" (585mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

The average length of the day in August is 13.6h.

Sunshine

The average sunshine in Marion, Illinois, is 10.3h.

UV index

Months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in August in Marion?

The average high-temperature, in August, in Marion, Illinois, is 85.6°F (29.8°C), while the average low-temperature is 66.4°F (19.1°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 96.8°F (36°C).

What is the average humidity in August in Marion?

In Marion, Illinois, the average relative humidity in August is 76%.

How much does it rain in Marion in August?

In Marion, in August, it is raining for 13.5 days, with typically 1.89" (48mm) of accumulated precipitation.

When it does not snow in Marion?

May through September are months without snowfall.

How many hours of daylight does Marion have in August?

In August, the average length of the day in Marion is 13.6h.

How many hours of sunshine does Marion have in August?

The average sunshine in August in Marion is 10.3h.

What is the month with the highest UV index in Marion?

Months with the highest UV index are May through August, with an average maximum UV index of 6.

What is the UV index reading in August in Marion?

In Marion, 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 the UV radiation.

Average temperature in August
Marion, IL

Average temperature in August - Marion, IL
  • Average high temperature in August: 85.6°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).

  • Average low temperature in August: 66.4°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure in August
Marion, IL

Average pressure in August - Marion, IL
  • Average pressure in August: 29.98"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in August
Marion, IL

Average wind speed in August - Marion, IL
  • Average wind speed in August: 5.8mph

The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

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Average humidity in August
Marion, IL

Average humidity in August - Marion, IL
  • Average humidity in August: 76%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in August
Marion, IL

Average rainfall in August - Marion, IL
  • Average rainfall in August: 1.89"

The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.1").

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Average rainfall days in August
Marion, IL

Average rainfall days in August - Marion, IL
  • Average rainfall days in August: 13.5 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.8 days).

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Average snowfall in August
Marion, IL

Average snowfall in August - Marion, IL
  • Average snowfall in August: 0"

Months with the highest snowfall are January and February (0.94").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in August
Marion, IL

Average snowfall days in August - Marion, IL
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (4.3 days).
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
Marion, IL

Average daylight in August / Average sunshine in August - Marion, IL
  • Average daylight in August: 13.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in August: 10.3h

Months with the most sunshine are June and July (Average sunshine: 10.5h).
The month with the least sunshine is January (Average sunshine: 4.6h).

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Average sunshine days in August
Marion, IL

Average sunshine days in August - Marion, IL
  • Average sunshine days in August: 14.9 days

The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (12.9 days).

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Average UV index in August
Marion, IL

Average UV index in August - Marion, IL
  • Average UV index in August: 6

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

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Average cloud cover in August
Marion, IL

Average cloud cover in August - Marion, IL
  • Average cloud cover in August: 28

The month with the most cloud cover is February (Cloud cover 51).
Months with the least cloud cover are June, August and September (Cloud cover 28).

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Average visibility in August
Marion, IL

Average visibility in August - Marion, IL
  • Average visibility in August: 6mi

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

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