August weather forecastHarristown, IL
August
Weather in August
August, the last month of the summer in Harristown, is also a moderately hot month, with an average temperature varying between 63.9°F (17.7°C) and 81.1°F (27.3°C).Temperature
Transitioning into August, Harristown experiences an average high-temperature of a still warm 81.1°F (27.3°C), marking a minor shift from the preceding month. During the month of August, the temperature generally drops to a low average of 63.9°F (17.7°C).Heat index
For most parts of August, the heat index is appraised at a hot 87.8°F (31°C). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.Heat index evaluations are typically in the context of light winds and shaded environments. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Humidity
In Harristown, the average relative humidity in August is 82%.Rainfall
In Harristown, in August, it is raining for 11.8 days, with typically 1.5" (38mm) of accumulated precipitation. Throughout the year, in Harristown, there are 130.2 rainfall days, and 16.34" (415mm) of precipitation is accumulated.Snowfall
In Harristown, snow does not fall in May through October.Daylight
In August, the average length of the day in Harristown is 13h and 41min.On the first day of the month, sunrise is at 5:55 am and sunset at 8:09 pm. On the last day of August, sunrise is at 6:24 am and sunset at 7:28 pm CDT.
Sunshine
The average sunshine in August is 9.9h.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 threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In August, the maximum UV index of 6 transforms into these recommendations:
Deter overexposure. Protecting against the sun's effects is essential. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Harristown, IL
- Average high temperature in August: 81.1°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in August: 63.9°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in August
Harristown, IL
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in August
Harristown, IL
- Average wind speed in August: 6.3mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in August
Harristown, IL
- Average humidity in August: 82%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in August
Harristown, IL
- Average rainfall in August: 1.5"
The wettest month (with the highest rainfall) is May (2.01").
The driest months (with the least rainfall) are February and December (0.87").
Average rainfall days in August
Harristown, IL
- Average rainfall days in August: 11.8 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in August
Harristown, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in August
Harristown, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in August /
Average sunshine in August
Harristown, IL
- Average daylight in August: 13h and 42min
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 24min).
- Average sunshine in August: 9h and 54min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in August
Harristown, IL
- Average sunshine days in August: 16.6 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in August
Harristown, 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).
Average cloud cover in August
Harristown, IL
- Average cloud cover in August: 31
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in August
Harristown, IL
- Average visibility in August: 5mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
