Mendota, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mendota, a city in Lasalle County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph.
7-day forecast for Mendota
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 67°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSW | 31% |
| Wednesday | 78°F | Chance Showers And Thunderstorms | 5 mph WSW | 64% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 5 mph NNE | 86% |
| Thursday | 78°F | Rain Showers Likely then Slight Chance Showers And Thunderstorms | 5 mph ENE | 59% |
| Thursday Night | 62°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph ESE | 18% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SE | 6% |
| Friday Night | 64°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 9% |
| Saturday Night | 69°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 16% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 16% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 32% |
| Monday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 32% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 10 mph W | 39% |
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 Aug 4, 2026.