August weather forecast
Grand Chain, IL

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Weather in August

The last month of the summer, August, is also a hot month in Grand Chain, Illinois, with an average temperature fluctuating between 66.7°F (19.3°C) and 86.5°F (30.3°C).

Temperature

Grand Chain, Illinois, observes a minor difference in average high-temperatures between July's 88°F (31.1°C) and August's 86.5°F (30.3°C). During the August nights, an average temperature of 66.7°F (19.3°C) is observed.

Heat index

During August, the heat index is appraised at a fiery hot 98.6°F (37°C). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is achieved by amalgamating air temperature with the relative humidity readings. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

The average relative humidity in August is 76%.

Rainfall

In Grand Chain, in August, it is raining for 11.9 days, with typically 1.3" (33mm) of accumulated precipitation. In Grand Chain, during the entire year, the rain falls for 118.3 days and collects up to 13.03" (331mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in August is 13h and 33min.
On the first day of August, sunrise is at 6:01 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 6:26 am and sunset at 7:25 pm CDT.

Sunshine

The average sunshine in August is 10.3h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 in August transforms into the following instructions:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. 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. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.

Frequently asked questions

How hot is August?

In August, the average high-temperature and low-temperature in Grand Chain are 86.5°F (30.3°C) and 66.7°F (19.3°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in August is appraised at 98.6°F (37°C).

What is the average humidity in August?

The average relative humidity in August is 76%.

How many days does it rain in August?

In Grand Chain, in August, it is raining for 11.9 days, with typically 1.3" (33mm) of accumulated precipitation.

When it does not snow?

April through October are months without snowfall.

How many hours of daylight does Grand Chain have in August?

In August, the average day length is 13h and 33min.

When are sunrise and sunset in August?

In August, on the first day of the month, sunrise is at 6:01 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 6:26 am and sunset at 7:25 pm CDT.

How many hours of sunshine does Grand Chain have in August?

The average sunshine duration in August is 10.3h.

What is the month with the highest UV index?

The 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 Grand Chain?

In Grand Chain, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health risk from 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
Grand Chain, IL

Average temperature in August - Grand Chain, IL
  • Average high temperature in August: 86.5°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in August: 66.7°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 (27°F).

Average pressure in August
Grand Chain, IL

Average pressure in August - Grand Chain, IL
  • Average pressure in August: 29.98"Hg

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

Average wind speed in August
Grand Chain, IL

Average wind speed in August - Grand Chain, IL
  • Average wind speed in August: 5.7mph

The windiest months (with the highest average wind speed) are January and February (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in August
Grand Chain, IL

Average humidity in August - Grand Chain, IL
  • Average humidity in August: 76%

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

Average rainfall in August
Grand Chain, IL

Average rainfall in August - Grand Chain, IL
  • Average rainfall in August: 1.3"

The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is September (0.47").

Average rainfall days in August
Grand Chain, IL

Average rainfall days in August - Grand Chain, IL
  • Average rainfall days in August: 11.9 days

The month with the highest number of rainy days is July (13.1 days).
The months with the least rainy days are January, February and December (7.3 days).

Average snowfall in August
Grand Chain, IL

Average snowfall in August - Grand Chain, IL
  • Average snowfall in August: 0"

The month with the highest snowfall is February (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in August
Grand Chain, IL

Average snowfall days in August - Grand Chain, IL
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in August /
Average sunshine in August
Grand Chain, IL

Average daylight in August / Average sunshine in August - Grand Chain, IL
  • Average daylight in August: 13h and 3min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in August: 10h and 2min

The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in August
Grand Chain, IL

Average sunshine days in August - Grand Chain, IL
  • Average sunshine days in August: 16.3 days

The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is June (14.8 days).

Average UV index in August
Grand Chain, IL

Average UV index in August - Grand Chain, IL
  • Average UV index in August: 6

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

Average cloud cover in August
Grand Chain, IL

Average cloud cover in August - Grand Chain, IL
  • Average cloud cover in August: 30

The months with the most cloud cover are January and February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).

Average visibility in August
Grand Chain, IL

Average visibility in August - Grand Chain, 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).

Grand Chain, Illinois, USA

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