Mount Carroll, IL Weather & Growing Conditions
Overnight
63°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms between 1am and 3am, then showers and thunderstorms likely between 3am and 4am, then patchy fog and occasional showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Chance Showers And Thunderstorms | 10 mph SE | 76% |
| Saturday | 78°F | Patchy Fog | 5 to 10 mph SE | 96% |
| Saturday Night | 62°F | Showers And Thunderstorms | 5 to 10 mph NW | 90% |
| Sunday | 69°F | Chance Rain Showers | 10 to 15 mph NE | 53% |
| Sunday Night | 55°F | Chance Rain Showers | 15 mph NE | 34% |
| Monday | 64°F | Chance Rain Showers | 15 mph NE | 46% |
| Monday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 28% |
| Tuesday | 63°F | Slight Chance Rain Showers then Partly Sunny | 15 mph NE | 20% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 15 mph NE | 7% |
| Wednesday | 66°F | Mostly Sunny | 10 mph NE | 2% |
| Wednesday Night | 50°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 67°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 51°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 70°F | Mostly Sunny | 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mount Carroll, IL
Last spring frost
May 2
First fall frost
Oct 7
Growing season
154 days
Hardiness zone
5a
Explore more for Mount Carroll, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mt Carroll, Il (1.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.