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
67°F
Rain Showers
Rain showers. Cloudy, with a high near 67. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for South Beloit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Rain Showers | 15 mph S | 84% |
| Tonight | 57°F | Rain Showers | 15 mph S | 83% |
| Wednesday | 60°F | Chance Rain Showers | 15 mph S | 50% |
| Wednesday Night | 45°F | Chance Rain Showers | 15 mph SW | 33% |
| Thursday | 54°F | Rain Showers Likely | 10 to 15 mph W | 64% |
| Thursday Night | 39°F | Chance Rain Showers | 5 to 10 mph NW | 34% |
| Friday | 50°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph N | 18% |
| Friday Night | 31°F | Partly Cloudy | 0 to 10 mph N | 2% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph W | 3% |
| Sunday | 58°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 16% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 5% |
| Monday | 60°F | Sunny | 5 to 15 mph SW | 1% |
| Monday Night | 37°F | Mostly Clear | 5 to 10 mph W | 1% |
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 Nov 4, 2026.