South Beloit, IL Weather & Growing Conditions
Tonight
60°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely between 11pm and 5am, then showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 60. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Showers And Thunderstorms Likely | 10 to 15 mph E | 83% |
| Saturday | 74°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph ESE | 95% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph ENE | 74% |
| Sunday | 66°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 62% |
| Sunday Night | 53°F | Chance Rain Showers | 15 mph NE | 40% |
| Monday | 62°F | Chance Rain Showers | 15 mph ENE | 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 | 26% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 10 mph NNE | 10% |
| 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 NNE | 5% |
| Thursday Night | 49°F | Mostly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 68°F | Mostly Sunny | 0 to 5 mph NE | 5% |
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 Sep 19, 2026.