Naperville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Naperville, a city in Dupage County, Illinois.
Today
78°F
Showers And Thunderstorms
Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Cloudy. High near 78, with temperatures falling to around 75 in the afternoon. Southeast wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Naperville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Showers And Thunderstorms | 5 to 10 mph SE | 100% |
| Tonight | 65°F | Showers And Thunderstorms | 5 to 10 mph ESE | 96% |
| Sunday | 70°F | Showers And Thunderstorms Likely | 10 to 15 mph NNE | 63% |
| Sunday Night | 57°F | Chance Rain Showers | 15 mph NE | 35% |
| Monday | 64°F | Chance Rain Showers | 15 mph ENE | 32% |
| Monday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 24% |
| Tuesday | 63°F | Slight Chance Rain Showers | 10 to 15 mph NE | 18% |
| Tuesday Night | 53°F | Mostly Cloudy | 10 to 15 mph NE | 8% |
| Wednesday | 65°F | Partly Sunny | 10 to 15 mph NE | 10% |
| Wednesday Night | 54°F | Mostly Cloudy | 5 to 10 mph NNE | 3% |
| Thursday | 67°F | Partly Sunny | 5 to 10 mph NNE | 3% |
| Thursday Night | 54°F | Mostly Cloudy | 5 to 10 mph NE | 3% |
| Friday | 71°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Friday Night | 54°F | Partly Cloudy | 5 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Naperville (41.749, -88.162). Updated through the day.
Growing snapshot for Naperville
Last spring frost
Apr 28
First fall frost
Oct 16
Growing season
169 days
Hardiness zone
5b
More local growing data for Naperville: nearby ZIP 60540 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Lisle-Morton Arboretum, Il (5 mi from Naperville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.