South Beloit, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Beloit, a city in Winnebago County, Illinois.
This Afternoon
70°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 70. East wind around 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for South Beloit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Chance Rain Showers | 10 mph E | 25% |
| Tonight | 61°F | Showers And Thunderstorms Likely | 10 mph E | 84% |
| Saturday | 74°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph SE | 95% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 74% |
| Sunday | 66°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 61% |
| Sunday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 39% |
| Monday | 62°F | Chance Rain Showers | 15 mph NE | 37% |
| Monday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 37% |
| Tuesday | 61°F | Chance Rain Showers | 10 to 15 mph NE | 25% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 10 mph NE | 9% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 5% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 10 mph NE | 2% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph NE | 5% |
| Thursday Night | 50°F | Mostly Cloudy | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for South Beloit (42.485, -89.027). Updated through the day.
Growing snapshot for South Beloit
Last spring frost
May 1
First fall frost
Oct 12
Growing season
162 days
Hardiness zone
5b
More local growing data for South Beloit: nearby ZIP 61080 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cherry Valley
Durand
Loves Park
Machesney Park
New Milford
Pecatonica
Rockford
Rockton
Roscoe
Westlake Village
Winnebago
Climate data from the nearest NOAA station, Beloit, Wi (2.9 mi from South Beloit). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.