August weather forecast
Saint David, IL

Weather in August

The last month of the summer, August, is another warm month in Saint David, Illinois, with an average temperature fluctuating between 82°F (27.8°C) and 63.7°F (17.6°C).

Temperature

In Saint David, the average high-temperature in August is relatively the same as in July - a still moderately hot 82°F (27.8°C). The average low-temperature, in Saint David, is 63.7°F (17.6°C).

Heat index

In August, the average heat index is evaluated at a tropical 89.6°F (32°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, metabolic differences, pregnancy, and wind affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.

Humidity

In August, the average relative humidity in Saint David is 80%.

Rainfall

In Saint David, Illinois, during August, the rain falls for 13.2 days and regularly aggregates up to 1.89" (48mm) of precipitation. In Saint David, during the entire year, the rain falls for 131.7 days and collects up to 22.48" (571mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In Saint David, the average length of the day in August is 13h and 44min.
On the first day of the month, sunrise is at 5:57 am and sunset at 8:15 pm. On the last day of August, sunrise is at 6:26 am and sunset at 7:34 pm CDT.

Sunshine

The average sunshine in August is 9.9h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in August in Saint David?

The average high-temperature, in August, in Saint David, is 82°F (27.8°C), while the average low-temperature is 63.7°F (17.6°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in August is evaluated at 89.6°F (32°C).

What is the average humidity in August in Saint David?

The average relative humidity in August in Saint David is 80%.

How many days does it rain in August in Saint David?

In Saint David, Illinois, during August, the rain falls for 13.2 days and regularly aggregates up to 1.89" (48mm) of precipitation.

When it does not snow in Saint David?

May through September are months without snowfall in Saint David, Illinois.

What is the average length of the day in August in Saint David?

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

When is the sunrise / sunset in August in Saint David?

On the first day of August in Saint David, sunrise is at 5:57 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 6:26 am and sunset at 7:34 pm CDT.

How long on average sun shines in August in Saint David?

In Saint David, Illinois, the average sunshine duration in August is 9.9h.

What are the months with the highest UV index in Saint David?

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

What is the UV index reading in August in Saint David?

In Saint David, Illinois, the average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Saint David, IL

Average temperature in August - Saint David, IL
  • Average high temperature in August: 82°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in August: 63.7°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).

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Average pressure in August
Saint David, IL

Average pressure in August - Saint David, IL
  • 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 (29.91"Hg).

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Average wind speed in August
Saint David, IL

Average wind speed in August - Saint David, IL
  • Average wind speed in August: 6.5mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).

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Average humidity in August
Saint David, IL

Average humidity in August - Saint David, IL
  • Average humidity in August: 80%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in August
Saint David, IL

Average rainfall in August - Saint David, IL
  • Average rainfall in August: 1.89"

The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is December (0.94").

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Average rainfall days in August
Saint David, IL

Average rainfall days in August - Saint David, IL
  • Average rainfall days in August: 13.2 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (4.7 days).

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Average snowfall in August
Saint David, IL

Average snowfall in August - Saint David, IL
  • Average snowfall in August: 0"

The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in August
Saint David, IL

Average snowfall days in August - Saint David, IL
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (9.4 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
Saint David, IL

Average daylight in August / Average sunshine in August - Saint David, IL
  • Average daylight in August: 13h and 44min

The month with the longest days is June (Average daylight: 15h and 1min).
The month with the shortest days is December (Average daylight: 9h and 20min).

  • Average sunshine in August: 9h and 54min

The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in August
Saint David, IL

Average sunshine days in August - Saint David, IL
  • Average sunshine days in August: 14.6 days

The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in August
Saint David, IL

Average UV index in August - Saint David, IL
  • 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
Saint David, IL

Average cloud cover in August - Saint David, IL
  • Average cloud cover in August: 30

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

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Average visibility in August
Saint David, IL

Average visibility in August - Saint David, IL
  • 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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