Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
The dawn of August sees an average high-temperature of a still moderately hot 80.1°F (26.7°C), subtly contrasting with July's 81.3°F (27.4°C). Throughout August, Joliet encounters an average temperature drop to an enjoyable 62.8°F (17.1°C).Humidity
In Joliet, the average relative humidity in August is 82%.Rainfall
In Joliet, during August, the rain falls for 15.8 days and regularly aggregates up to 2.83" (72mm) of precipitation. Throughout the year, there are 153.6 rainfall days, and 32.72" (831mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Joliet, the average length of the day in August is 13h and 47min.On the first day of the month, sunrise is at 5:47 am and sunset at 8:09 pm. On the last day of August, sunrise is at 6:18 am and sunset at 7:26 pm CDT.
Sunshine
The month with the most sunshine is August, with an average of 9.7h of sunshine.UV index
The average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The average daily UV index of 5 in August transforms into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in August?
What is the average humidity in August?
How many days does it rain in August?
When it does not snow?
How many hours of daylight does Joliet have in August?
When are sunrise and sunset in August?
What month has the most sunshine?
How long on average sun shines in August?
How high is the UV index in August?
Average temperature in August
Joliet, IL
- Average high temperature in August: 80.1°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in August: 62.8°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in August
Joliet, IL
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in August
Joliet, IL
- Average wind speed in August: 5.9mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in August
Joliet, IL
- Average humidity in August: 82%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in August
Joliet, IL
- Average rainfall in August: 2.83"
The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in August
Joliet, IL
- Average rainfall days in August: 15.8 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in August
Joliet, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (4.33").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in August
Joliet, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (11.9 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
Joliet, IL
- Average daylight in August: 13h and 5min
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 4min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in August
Joliet, IL
- Average sunshine days in August: 11.8 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in August
Joliet, IL
- Average UV index in August: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in August
Joliet, IL
- Average cloud cover in August: 34
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in August
Joliet, IL
- Average visibility in August: 5mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Joliet, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location