The most pleasant months of the year for Joliet are September, June and August. In Joliet, there are 5 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Joliet with an average high temperature of 84.3°, which ranks it as cooler than most places in Illinois. December is the snowiest month in Joliet with 8.6 inches of snow, and 5 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.
Today's Weather - Joliet, IL
7 PM PST
Mostly Cloudy then Patchy Fog
|7 DAY FORECAST||DESCRIPTION||HIGH/LOW||WIND|
|Tonight||Mostly Cloudy then Patchy Fog||56° / 79°||NNE 0 to 5 mph|
|Tuesday Night||Mostly Cloudy then Chance Showers And Thunderstorms||61° / 76°||E 0 to 5 mph|
|Wednesday Night||Showers And Thunderstorms Likely||58° / 74°||NNE 10 mph|
|Thursday Night||Partly Cloudy||56° / 78°||ESE 5 mph|
|Friday Night||Chance Showers And Thunderstorms||64° / 85°||SE 10 mph|
|Saturday Night||Chance Showers And Thunderstorms||66° / 82°||SW 10 mph|
|Sunday Night||Chance Showers And Thunderstorms||64° / 81°||S 5 to 10 mph|
Weather Highs & Lows
Summer High: the July high is around 84 degrees
Winter Low: the January low is 16
SPERLING'S COMFORT INDEX
Joliet ranks 41/100 for Comfort Index
A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 54. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
YOU SHOULD KNOW
Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.
Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.
Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.
Average Monthly High / Low (°F)
|January||31° / 16°|
|February||36° / 20°|
|March||48° / 29°|
|April||61° / 39°|
|May||71° / 49°|
|June||81° / 60°|
|July||84° / 64°|
|August||82° / 63°|
|September||76° / 54°|
|October||64° / 43°|
|November||49° / 33°|
|December||35° / 20°|
Hot, Freezing, Rainy, Snowy Days: Joliet
|Month||Hot Days||Freezing Days||Rainy Days||Snowy Days|