Joliet, IL Weather

Joliet, IL climate is warm during summer when temperatures tend to be in the 70's and very cold during winter when temperatures tend to be in the 20's.

The warmest month of the year is July with an average maximum temperature of 84.60 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 13.50 degrees Fahrenheit.

Temperature variations between night and day tend to be moderate during summer with a difference that can reach 22 degrees Fahrenheit, and fairly limited during winter with an average difference of 17 degrees Fahrenheit.

The annual average precipitation at Joliet is 36.96 Inches. Rainfall in is fairly evenly distributed throughout the year. The wettest month of the year is July with an average rainfall of 4.34 Inches.

Weather Data

Current Conditions

(Updated: 11:05 AM CDT MON OCT 13 2008)

Overcast, 72°F	Humidity: 65%	Dewpoint: 59°F
	Wind Speed: S 9 MPH	Heat Index: 72°F
	Barometer: 30.27 in.	Wind Chill: 72°F

Weather Forecast

(Generated: 4:16 AM CDT MON OCT 13 2008)

	Hi: 81°F	Today: Partly sunny in the morning then becoming mostly cloudy late in the morning then becoming partly sunny late in the afternoon. Highs in the lower 80s. South winds 10 to 15 mph.
	Lo: 60°F
	Hi: 71°F	Tuesday: Mostly cloudy with chance of showers and isolated thunderstorms. Highs in the lower 70s. Light and variable winds. Chance of precipitation 40 percent.
	Lo: 50°F
	Hi: 65°F	Wednesday: Cloudy. Chance of rain in the morning...Then a chance of showers in the afternoon. Cooler. Highs in the mid 60s. Northwest winds around 10 mph. Chance of precipitation 30 percent.
	Lo: 41°F
	Hi: 61°F	Thursday: Mostly sunny in the morning then becoming partly cloudy. Highs in the lower 60s.
	Lo: 41°F
	Hi: 59°F	Friday: Mostly cloudy in the morning then becoming partly sunny. A 20 percent chance of showers. Highs in the upper 50s.
	Lo: 39°F
	Hi: 60°F	Saturday: Mostly clear. Lows in the upper 30s. Highs around 60.
	Lo: 41°F

Moon, Sunrise and Sunset

	Moon Phase: Full Moon	Civil Twilight: 6:33 AM CDT	Sunrise: 7:01 AM CDT
		Sunset: 6:14 PM CDT	Civil Twilight: 6:42 PM CDT

Normal Climate

Normal Temperatures

(JOLIET BRANDON RD DAM Weather station, 1.97 miles from Joliet)

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
Max °F	29.9	35.2	46.8	59.5	71.6	81.3	84.6	82.4	76.0	64.1	48.3	35.2	59.6
Mean °F	21.7	26.9	37.2	48.2	59.6	69.8	73.7	71.6	64.5	52.7	39.9	27.4	49.4
Min °F	13.5	18.6	27.6	36.9	47.5	58.2	62.8	60.7	52.9	41.2	31.4	19.5	39.2

Normal Precipitation