Naperville, IL Weather

Naperville, 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 86.80 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 14.20 degrees Fahrenheit.

Temperature variations between night and day tend to be moderate during summer with a difference that can reach 24 degrees Fahrenheit, and fairly limited during winter with an average difference of 18 degrees Fahrenheit.

The annual average precipitation at Naperville is 37.94 Inches. Rainfall in is fairly evenly distributed throughout the year. The wettest month of the year is August with an average rainfall of 4.60 Inches.

Weather Data

Current Conditions

(Updated: 4:52 PM CST SUN NOV 8 2009)

Fair, 64°F	Humidity: 70%	Dewpoint: 54°F
	Wind Speed: S 9.2 MPH (8 KT)	Heat Index: 64°F
	Barometer: 30.02 in.	Wind Chill: 64°F

Weather Forecast

(Generated: 3:37 PM CST SUN NOV 08 2009)

		Tonight: Becoming partly cloudy. Patchy fog during the predawn hours. Continued unseasonably mild. Lows in the lower 50s. South winds 10 to 15 mph.
	Lo: 51°F
	Hi: 65°F	Monday: Mostly cloudy. A 20 percent chance of showers in the afternoon. Highs in the mid 60s. Southwest winds around 10 mph early in the morning becoming light and variable in the late morning and early afternoon...Then becoming northeast around 10 mph late in the afternoon.
	Lo: 45°F
	Hi: 59°F	Tuesday: Partly sunny. A 30 percent chance of showers in the morning. Highs in the upper 50s. Northeast winds 10 to 15 mph.
	Lo: 35°F
	Hi: 55°F	Veterans day: Sunny. Highs in the mid 50s.
	Lo: 39°F
	Hi: 59°F	Thursday: Mostly sunny. Highs in the upper 50s.
	Lo: 45°F
	Hi: 60°F	Friday: Partly cloudy. Lows in the mid 40s. Highs around 60.
	Lo: 45°F
	Hi: 60°F	Friday: Partly cloudy. Lows in the mid 40s. Highs around 60.
	Lo: 45°F

Moon, Sunrise and Sunset

	Moon Phase: Waning Gibbous Moon	Civil Twilight: 6:03 AM CST	Sunrise: 6:32 AM CST
		Sunset: 4:39 PM CST	Civil Twilight: 5:08 PM CST

Normal Climate

Normal Temperatures

(WHEATON 3 SE Weather station, 4.63 miles from Naperville)

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
Max °F	32.0	38.0	50.0	62.8	74.8	83.8	86.8	85.0	78.4	66.5	50.0	36.9	62.1
Mean °F	23.1	28.5	39.2	50.2	61.2	70.6	74.8	73.3	65.9	54.3	40.9	28.7	50.9
Min °F	14.2	18.9	28.4	37.6	47.6	57.4	62.8	61.5	53.4	42.1	31.7	20.5	39.7

Normal Precipitation