Naperville weather by month
Average highs run from 33°F in January to 86°F in July, and January nights average 17°F. It gets 40 inches of rain and melted snow a year and 24 inches of snow. Nights drop below freezing about 128 times a year. The most comfortable months are May and July to October.
Best time to visit Naperville
For comfortable weather, go in May and July to October. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 17°F | 2.1 in | 9.3 in | 5 | 0 | 28 | very cold |
| February | 38°F | 20°F | 2.0 in | 5.1 in | 4 | 0 | 24 | cold |
| March | 50°F | 29°F | 2.5 in | 4.5 in | 6 | 0 | 22 | cool |
| April | 63°F | 38°F | 4.1 in | 0.3 in | 7 | 0 | 8 | mild days, chilly nights |
| May | 74°F | 49°F | 4.5 in | 0.0 in | 8 | 2 | 1 | mild |
| June | 83°F | 59°F | 4.7 in | 0.0 in | 7 | 8 | 0 | warm |
| July | 86°F | 63°F | 3.9 in | 0.0 in | 6 | 10 | 0 | warm |
| August | 84°F | 62°F | 4.4 in | 0.0 in | 6 | 7 | 0 | warm |
| September | 78°F | 54°F | 3.3 in | 0.0 in | 5 | 2 | 0 | warm |
| October | 65°F | 43°F | 3.6 in | 0.0 in | 6 | 0 | 5 | mild |
| November | 50°F | 32°F | 2.8 in | 0.9 in | 5 | 0 | 16 | cool |
| December | 38°F | 23°F | 2.2 in | 4.2 in | 4 | 0 | 25 | cold |
| Year | 62°F avg | 41°F avg | 39.9 in | 24.3 in | 69 | 29 | 128 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Wheaton 3 SE, IL (USC00119221), 4 miles from the city center. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Naperville
The shortest day is December 21, with 9h 08m of daylight; the longest is June 21, with 15h 13m. The earliest sunset comes around December 3 (4:21 pm) and the latest around June 23 (8:31 pm). The sun sets after 8 pm on 92 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:17 am | 4:46 pm | 9h 29m |
| February | 6:48 am | 5:25 pm | 10h 37m |
| March | 7:04 am | 6:59 pm | 11h 55m |
| April | 6:12 am | 7:33 pm | 13h 21m |
| May | 5:32 am | 8:05 pm | 14h 33m |
| June | 5:17 am | 8:28 pm | 15h 12m |
| July | 5:31 am | 8:25 pm | 14h 54m |
| August | 6:01 am | 7:52 pm | 13h 51m |
| September | 6:33 am | 7:01 pm | 12h 28m |
| October | 7:05 am | 6:10 pm | 11h 06m |
| November | 6:42 am | 4:31 pm | 9h 49m |
| December | 7:13 am | 4:22 pm | 9h 09m |
Calculated for 2026 at the center of Naperville with NOAA's solar equations, in local clock time (Central Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Naperville getting warmer?
The last 10 years averaged 2.5°F warmer than the 20th century. See the climate stripes for Naperville.Frequently asked questions
What is the warmest month in Naperville?
July is the warmest month, with an average high of 86°F and an average low of 63°F (NOAA 1991-2020 normals).
What is the coldest month in Naperville?
January is the coldest, with average lows of 17°F and highs of 33°F.
What is the rainiest month in Naperville?
June gets the most precipitation, 4.7 inches on average. February is the driest at 2.0 inches.
Does it snow in Naperville?
Yes. Naperville averages 24 inches of snow a year.
When is the best time to visit Naperville?
For comfortable weather, May and July to October. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Naperville?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Naperville profile.
Compare the weather: Naperville vs Aurora, Naperville vs Schaumburg, Naperville vs Joliet, Naperville vs Elgin.