South Beloit, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Southwest wind around 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 10 mph SW | 8% |
| Tonight | 64°F | Chance Showers And Thunderstorms | 5 mph WNW | 74% |
| Wednesday | 76°F | Showers And Thunderstorms Likely | 5 mph NW | 74% |
| Wednesday Night | 58°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph NW | 62% |
| Thursday | 78°F | Chance Rain Showers then Partly Sunny | 0 to 5 mph NE | 30% |
| Thursday Night | 57°F | Mostly Clear | 0 mph | 11% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 3% |
| Friday Night | 61°F | Mostly Clear | 0 to 5 mph SSW | 5% |
| Saturday | 83°F | Mostly Sunny | 0 to 10 mph SSW | 10% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 24% |
| Sunday | 84°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 24% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SSW | 44% |
| Monday | 83°F | Chance Rain Showers | 5 to 10 mph SSW | 43% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph NW | 44% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for South Beloit, IL
Last spring frost
May 1
First fall frost
Oct 12
Growing season
162 days
Hardiness zone
5b
Explore more for South Beloit, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Beloit, Wi (2.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.