Mendota, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mendota, a city in Lasalle County, Illinois.
Overnight
56°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 56, with temperatures rising to around 59 overnight. South southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mendota
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Chance Rain Showers | 15 mph SSW | 50% |
| Wednesday | 60°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 16% |
| Wednesday Night | 46°F | Mostly Cloudy | 15 mph SW | 13% |
| Thursday | 56°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph W | 38% |
| Thursday Night | 41°F | Chance Rain Showers | 10 mph NW | 30% |
| Friday | 50°F | Partly Sunny | 10 to 15 mph N | 6% |
| Friday Night | 32°F | Partly Cloudy | 5 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph WNW | 1% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 4% |
| Sunday Night | 34°F | Clear | 0 to 5 mph W | 0% |
| Monday | 61°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph WSW | 1% |
| Tuesday | 63°F | Sunny | 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Mendota (41.557, -89.101). Updated through the day.
Growing snapshot for Mendota
Last spring frost
Apr 27
First fall frost
Oct 15
Growing season
171 days
Hardiness zone
5b
More local growing data for Mendota: nearby ZIP 61342 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cedar Point
Dana
Dayton
Earlville
Grand Ridge
Harding
Kangley
LaSalle
Leland
Leonore
Lostant
Marseilles
Millington
Naplate
Newark
North Utica
Oglesby
Ottawa
Peru
Ransom
Rutland
Seneca
Serena
Sheridan
Streator
Tonica
Triumph
Troy Grove
Wedron
Wenona
Climate data from the nearest NOAA station, Paw Paw 2S, Il (10 mi from Mendota). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.