Janesville, IL Weather & Growing Conditions
Today
84°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 84. South southeast wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Patchy Fog then Sunny | 1 to 5 mph SSE | 0% |
| Tonight | 64°F | Mostly Clear | 3 mph SSE | 0% |
| Wednesday | 85°F | Sunny | 5 mph S | 1% |
| Wednesday Night | 67°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 35% |
| Thursday | 82°F | Showers And Thunderstorms Likely | 6 mph SSW | 67% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms | 5 mph S | 37% |
| Friday | 83°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 24% |
| Friday Night | 67°F | Slight Chance Showers And Thunderstorms | 3 mph SSW | 20% |
| Saturday | 85°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 19% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 mph SSW | 16% |
| Sunday | 87°F | Sunny | 6 to 10 mph SSW | 8% |
| Sunday Night | 71°F | Mostly Clear | 8 mph SSW | 9% |
| Monday | 88°F | Mostly Sunny | 10 mph SW | 12% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 8 mph SSW | 24% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Janesville, IL
Last spring frost
Apr 15
First fall frost
Oct 24
Growing season
189 days
Hardiness zone
6a
Explore more for Janesville, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mattoon Coles Co Ap, Il (5.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.