LaSalle, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for LaSalle, a city in Lasalle County, Illinois.
This Afternoon
76°F
Slight Chance Rain Showers
A slight chance of rain showers before 5pm. Partly sunny, with a high near 76. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for LaSalle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Slight Chance Rain Showers | 10 mph E | 20% |
| Tonight | 66°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph ESE | 27% |
| Saturday | 83°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 59% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely | 5 mph NNW | 79% |
| Sunday | 72°F | Showers And Thunderstorms | 10 to 15 mph NE | 79% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 15 mph NE | 71% |
| Monday | 66°F | Showers And Thunderstorms Likely | 15 mph ENE | 62% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 39% |
| Tuesday | 65°F | Chance Rain Showers | 10 to 15 mph NE | 30% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 10 mph NNE | 7% |
| Wednesday | 68°F | Partly Sunny | 5 to 10 mph NNE | 5% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 10 mph NNE | 5% |
| Thursday | 70°F | Mostly Sunny | 5 mph NNE | 3% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NNE | 3% |
Forecast source: National Weather Service (api.weather.gov) for LaSalle (41.335, -89.097). Updated through the day.
Growing snapshot for LaSalle
Last spring frost
Apr 24
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
5b
More local growing data for LaSalle: nearby ZIP 61354 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Peru, Il (2.1 mi from LaSalle). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.