Mendon, IL Weather & Growing Conditions
This Afternoon
69°F
Light Rain
Rain and a slight chance of thunderstorms. Cloudy, with a high near 69. South wind around 18 mph, with gusts as high as 29 mph. Chance of precipitation is 100%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Light Rain | 18 mph S | 96% |
| Tonight | 52°F | Chance Light Rain then Chance Rain Showers | 10 to 15 mph S | 47% |
| Wednesday | 57°F | Chance Rain Showers then Cloudy | 12 to 17 mph SW | 12% |
| Wednesday Night | 45°F | Mostly Cloudy | 10 mph SW | 1% |
| Thursday | 58°F | Partly Sunny | 9 to 13 mph W | 9% |
| Thursday Night | 44°F | Mostly Cloudy then Slight Chance T-storms | 8 mph NW | 24% |
| Friday | 54°F | Mostly Cloudy | 10 mph N | 5% |
| Friday Night | 38°F | Partly Cloudy | 2 to 7 mph N | 1% |
| Saturday | 55°F | Mostly Sunny | 5 mph NW | 1% |
| Saturday Night | 38°F | Mostly Clear | 5 mph W | 2% |
| Sunday | 61°F | Sunny | 5 to 8 mph W | 9% |
| Sunday Night | 38°F | Mostly Clear | 6 mph W | 3% |
| Monday | 65°F | Sunny | 5 to 10 mph SW | 2% |
| Monday Night | 43°F | Mostly Clear | 7 mph W | 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.