Mendon, IL Weather & Growing Conditions
Today
55°F
Patchy Drizzle
Patchy drizzle before 2pm. Cloudy, with a high near 55. West wind 12 to 16 mph, with gusts as high as 24 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 55°F | Patchy Drizzle | 12 to 16 mph W | 12% |
| Tonight | 45°F | Mostly Cloudy | 12 mph W | 2% |
| Thursday | 57°F | Mostly Cloudy | 8 to 14 mph W | 12% |
| Thursday Night | 45°F | Slight Chance Light Rain then Mostly Cloudy | 9 mph NW | 18% |
| Friday | 52°F | Partly Sunny | 7 to 10 mph N | 4% |
| Friday Night | 34°F | Partly Cloudy | 2 to 6 mph N | 0% |
| Saturday | 53°F | Mostly Sunny | 5 mph NW | 0% |
| Saturday Night | 36°F | Mostly Clear | 3 mph W | 1% |
| Sunday | 59°F | Sunny | 3 to 7 mph W | 1% |
| Sunday Night | 37°F | Clear | 3 mph W | 0% |
| Monday | 65°F | Sunny | 3 to 8 mph SW | 0% |
| Monday Night | 42°F | Clear | 6 mph SW | 0% |
| Tuesday | 66°F | Sunny | 5 mph NW | 0% |
| Tuesday Night | 44°F | Mostly Clear | 3 mph NE | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mendon, IL
Last spring frost
Apr 14
First fall frost
Oct 23
Growing season
191 days
Hardiness zone
6a
Explore more for Mendon, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Quincy Rgnl Ap, Il (12.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.