Naperville, Illinois Weather
Naperville weather this week
Over the next 7 days in Naperville, daytime highs range from 8°C to 14°C and night-time lows from -3°C to 7°C. The warmest afternoon is likely on Thursday at 14°C, while the coolest night is expected on Monday night at -3°C. Temperatures trend warmer through the week, rising by about 4°C.
No significant rain is expected in Naperville this week. The highest rain chance is just 11%, on Thursday.
Winds stay mostly light this week, peaking at about 27 km/h on Thursday. UV levels stay moderate or lower, peaking at 3. Average humidity is a comfortable 63% or so.
| Day | Conditions | High / Low | Rain chance | Rain | Max wind |
|---|---|---|---|---|---|
| Today (Saturday) | Overcast | 8° / -1° | 1% | 0.0 mm | 16 km/h |
| Tomorrow (Sunday) | Overcast | 10° / -3° | 0% | 0.0 mm | 8 km/h |
| Monday | Overcast | 10° / -3° | 0% | 0.0 mm | 15 km/h |
| Tuesday | Overcast | 12° / 3° | 0% | 0.0 mm | 16 km/h |
| Wednesday | Overcast | 13° / 5° | 0% | 0.0 mm | 27 km/h |
| Thursday | Overcast | 14° / 7° | 11% | 0.0 mm | 27 km/h |
| Friday | Overcast | 13° / 6° | 7% | 0.0 mm | 18 km/h |
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Today's outlook for Naperville
At 23:00 local time it is 0°C in Naperville under clear skies, feeling like -3°C. Today's forecast high is 8°C and the low is -1°C, and the day overall looks overcast. Rain is unlikely today (1% chance). Winds are blowing at about 6 km/h from the north-west. Humidity is 79%.
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Climate of Naperville: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Naperville, with average daytime highs around 29°C. January is the coolest, when nights typically fall to about -10°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 39°C, so the seasons feel very different from each other.
The area receives about 980 mm of rain in a typical year. Most of it falls from May to August, and May is the wettest month at roughly 120 mm.
For outdoor plans and travel, September usually offers the most comfortable weather in Naperville, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | -1° | -10° | 44 mm | 87% |
| Feb | 0° | -9° | 51 mm | 85% |
| Mar | 7° | -3° | 63 mm | 80% |
| Apr | 15° | 3° | 95 mm | 76% |
| May | 21° | 9° | 120 mm | 76% |
| Jun | 26° | 15° | 112 mm | 74% |
| Jul | 29° | 18° | 100 mm | 72% |
| Aug | 28° | 17° | 106 mm | 72% |
| Sep | 24° | 13° | 87 mm | 74% |
| Oct | 16° | 5° | 91 mm | 76% |
| Nov | 8° | -1° | 58 mm | 81% |
| Dec | 1° | -6° | 57 mm | 87% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Naperville. Values describe typical conditions, not a forecast.
About Naperville weather
Naperville is a place in Illinois's humid continental climate, shaped by its Great Lakes and prairie geography, located about 44 km west of Chicago. Naperville gets warm, humid summers (June–August) each year. Naperville closes out the year with cold winters (December–February) with regular snow, colder near Lake Michigan. This page shows live, auto-refreshing weather for Naperville: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Naperville is about 44 km west of Chicago, in Illinois.
Naperville sees cold winters (December–February) with regular snow, colder near Lake Michigan.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Naperville's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Naperville, with average daytime highs of about 29°C and nights around 18°C.
The coldest nights come in January, when the average low is about -10°C and daytime highs reach around -1°C. Frost is possible on clear, calm nights.
Naperville receives about 980 mm of rain in a typical year. May is the wettest month at roughly 120 mm, and the main rainy period is May to August.
September usually offers the most comfortable weather in Naperville, with mild daytime temperatures and little rain.
In November Naperville typically sees daytime highs near 8°C and lows near -1°C, with about 58 mm of rain over the month and average humidity around 81%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Naperville updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Naperville's day-to-day weather follows the broader pattern of Illinois described above. See the hourly weather forecast or the air quality index for more detail.