August weather forecastIllinois City, IL
August
Weather in August
The last month of the summer, August, is also a moderately hot month in Illinois City, Illinois, with temperature in the range of an average high of 80.8°F (27.1°C) and an average low of 63.1°F (17.3°C).Temperature
August welcomes an average high-temperature of a still warm 80.8°F (27.1°C), not much different from the preceding month. During the month of August, Illinois City anticipates a mean low-temperature of 63.1°F (17.3°C).Heat index
For most parts of August, the heat index is appraised at a hot 86°F (30°C). If one remains active during constant exposure, it might cause exhaustion and heat cramps.Heat index data is primarily for areas with shade and subjected to light winds. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are quite important for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Humidity
The average relative humidity in August is 80%.Rainfall
In Illinois City, during August, the rain falls for 12.3 days and regularly aggregates up to 1.5" (38mm) of precipitation. Throughout the year, there are 128 rainfall days, and 19.29" (490mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In August, the average length of the day is 13h and 47min.On the first day of August, sunrise is at 5:59 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 6:29 am and sunset at 7:37 pm CDT.
Sunshine
The average sunshine in August in Illinois City is 9.9h.UV index
In Illinois City, the average daily maximum UV index in August is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index, 5 during August, leads to the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Illinois City, IL
- Average high temperature in August: 80.8°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in August: 63.1°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in August
Illinois City, 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 (29.9"Hg).
Average wind speed in August
Illinois City, IL
- Average wind speed in August: 6.7mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in August
Illinois City, IL
- Average humidity in August: 80%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in August
Illinois City, IL
- Average rainfall in August: 1.5"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is December (0.75").
Average rainfall days in August
Illinois City, IL
- Average rainfall days in August: 12.3 days
The month with the highest number of rainy days is June (17 days).
The month with the least rainy days is January (4.2 days).
Average snowfall in August
Illinois City, IL
- Average snowfall in August: 0"
The month with the highest snowfall is February (2.52").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Illinois City, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (10.3 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
Illinois City, IL
- Average daylight in August: 13h and 48min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 9h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in August
Illinois City, IL
- Average sunshine days in August: 15.5 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in August
Illinois City, IL
- 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).
Average cloud cover in August
Illinois City, IL
- Average cloud cover in August: 29
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in August
Illinois City, 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).
