Mendota, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mendota, a city in Lasalle County, Illinois.
Today
80°F
Showers And Thunderstorms
Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Cloudy, with a high near 80. Southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Mendota
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Showers And Thunderstorms | 5 mph SE | 99% |
| Tonight | 64°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph SW | 95% |
| Sunday | 71°F | Showers And Thunderstorms Likely | 10 to 15 mph NNE | 66% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 15 mph NE | 44% |
| Monday | 65°F | Chance Rain Showers | 15 mph ENE | 54% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 27% |
| Tuesday | 63°F | Slight Chance Rain Showers | 15 mph NE | 18% |
| Tuesday Night | 50°F | Partly Cloudy | 10 to 15 mph NE | 11% |
| Wednesday | 66°F | Mostly Sunny | 10 to 15 mph NNE | 4% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NNE | 1% |
| Thursday | 68°F | Mostly Sunny | 5 to 10 mph NNE | 4% |
| Thursday Night | 52°F | Partly Cloudy | 5 mph NE | 3% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 2% |
| Friday Night | 52°F | Partly Cloudy | 5 mph NE | 2% |
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 Sep 19, 2026.