Mendon, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mendon, a village in Adams County, Illinois.
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 30 mph. Chance of precipitation is 100%.
7-day forecast for Mendon
| 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 | 12 to 15 mph S | 48% |
| Wednesday | 57°F | Chance Rain Showers then Cloudy | 12 to 16 mph SW | 12% |
| Wednesday Night | 48°F | Partly Cloudy | 10 mph SW | 1% |
| Thursday | 60°F | Mostly Sunny | 8 to 12 mph W | 9% |
| Thursday Night | 46°F | Chance Light Rain then Mostly Cloudy | 7 mph NW | 29% |
| Friday | 57°F | Partly Sunny | 9 mph N | 11% |
| Friday Night | 43°F | Partly Cloudy | 2 to 7 mph N | 4% |
| Saturday | 57°F | Partly Sunny | 5 mph NW | 1% |
| Saturday Night | 40°F | Partly Cloudy | 5 mph W | 3% |
| Sunday | 58°F | Mostly Sunny | 5 to 9 mph W | 9% |
| Sunday Night | 40°F | Mostly Clear | 6 mph W | 3% |
| Monday | 62°F | Sunny | 5 to 8 mph SW | 2% |
| Monday Night | 43°F | Clear | 5 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Mendon (40.089, -91.286). Updated through the day.
Growing snapshot for Mendon
Last spring frost
Apr 14
First fall frost
Oct 23
Growing season
191 days
Hardiness zone
6a
More local growing data for Mendon: nearby ZIP 62351 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Adams
Bloomfield
Burton
Camp Point
Clayton
Coatsburg
Columbus
Fall Creek
Fowler
Golden
Kingston
La Prairie
Liberty
Lima
Loraine
Marcelline
Paloma
Payson
Plainville
Quincy
Richfield
Ursa
Climate data from the nearest NOAA station, Quincy Rgnl Ap, Il (12.9 mi from Mendon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.