Historical Weather in Naperville, IL
See 55+ years of weather history for any date in Naperville going back to 1970.
Part of Illinois weather history · Illinois temperature records
Look Up a Specific Date
Today in Naperville Weather HistorySee records, averages, and 55+ years of data for today's date
→Trending Now
Monthly Climate Averages
Historical temperature and precipitation averages for Naperville, IL, based on 55+ years of weather data.
Warmest MonthJulyAvg High: 85°F / Low: 63°F
Coldest MonthJanuaryAvg High: 31°F / Low: 14°F
Jan
31°/ 14°
💧 4.7"
❄️ 1.5"
Feb
36°/ 18°
💧 5.4"
❄️ 1.7"
Mar
48°/ 28°
💧 6.8"
❄️ 1.5"
Apr
61°/ 38°
💧 8.2"
❄️ 2.0"
May
72°/ 48°
💧 9.3"
Jun
82°/ 58°
💧 10.0"
Jul
85°/ 63°
💧 11.3"
Aug
83°/ 61°
💧 11.5"
Sep
77°/ 54°
💧 10.0"
Oct
64°/ 42°
💧 8.8"
❄️ 1.1"
Nov
49°/ 31°
💧 7.8"
❄️ 1.3"
Dec
36°/ 20°
💧 6.1"
❄️ 1.6"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Naperville, IL Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Avg high Avg low
Naperville, IL Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Rain (in) Snow (in)
Naperville, IL Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Cooler
Hotter
20°40°60°80°100°
Best Time to Visit Naperville, IL
Naperville, IL has no months that meet our "pleasant" threshold — every season has tradeoffs.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Pleasant (65-82°F, ≤2.5" rain) Mild Less ideal
Naperville Temperature Records
- Record High: The hottest temperature ever recorded in Naperville, IL is 103°F, set on June 25, 1988.
- Record Low: The coldest temperature ever recorded in Naperville, IL is -29°F, set on January 31, 2019.
- Data Coverage: Based on 20 years of data from NOAA weather station: LISLE - MORTON ARBORETUM.
All-Time Record High
103°F
June 25, 1988
All-Time Record Low
-29°F
January 31, 2019
Monthly Temperature Records in Naperville
| Month | Record High | Record Low |
|---|---|---|
| January | 66°F(1989) | -29°F(2019) |
| February | 74°F(2024) | -24°F(2019) |
| March | 86°F(2012) | -13°F(2002) |
| April | 91°F(1986) | 8°F(1982) |
| May | 97°F(2012) | 22°F(2013) |
| June | 103°F(1988) | 32°F(1996) |
| July | 103°F(2012) | 42°F(1983) |
| August | 101°F(1991) | 42°F(2009) |
| September | 95°F(1983) | 28°F(1995) |
| October | 92°F(1971) | 15°F(1988) |
| November | 77°F(1974) | -2°F(1976) |
| December | 71°F(2012) | -22°F(1983) |
Naperville Snow RecordsSee the top 10 snowiest days ever recorded
→Holiday Weather in Naperville
Weather Analysis & Trends
RecordsHottest Temperatures Ever Recorded in Every US StateAll 50 state record highs ranked, including Illinois.Severe WeatherTornado Season 2026: Forecasts & What to ExpectAn EF5 already, and the peak still ahead.Climate ForecastEl Niño 2026: What Every US Region Should Expect85% likely by late 2026. Region-by-region impact analysis.