LaSalle, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for LaSalle, a city in Lasalle County, Illinois.

Overnight

58°F

Slight Chance Rain Showers

A slight chance of rain showers. Mostly cloudy. Low around 58, with temperatures rising to around 60 overnight. South southwest wind around 15 mph, with gusts as high as 25 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
Overnight	58°F	Slight Chance Rain Showers	15 mph SSW	16%
Wednesday	61°F	Patchy Drizzle	15 mph SW	15%
Wednesday Night	47°F	Patchy Drizzle then Mostly Cloudy	15 mph SW	13%
Thursday	57°F	Mostly Cloudy then Chance Rain Showers	10 to 15 mph WSW	31%
Thursday Night	42°F	Chance Rain Showers	10 mph NW	38%
Friday	51°F	Partly Sunny	10 mph N	6%
Friday Night	32°F	Partly Cloudy	0 to 10 mph NNW	0%
Saturday	52°F	Sunny	0 to 5 mph NW	0%
Saturday Night	33°F	Mostly Clear	0 mph	1%
Sunday	56°F	Sunny	0 to 10 mph W	3%
Sunday Night	34°F	Clear	0 to 5 mph W	0%
Monday	62°F	Sunny	0 to 5 mph SW	0%
Monday Night	39°F	Mostly Clear	0 to 5 mph WSW	1%
Tuesday	63°F	Sunny	0 to 5 mph WNW	1%

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

More local growing data for LaSalle: nearby ZIP 61354 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

Cedar Point Dana Dayton Earlville Grand Ridge Harding Kangley Leland Leonore Lostant Marseilles Mendota Millington Naplate Newark North Utica Oglesby Ottawa Peru Ransom Rutland Seneca Serena Sheridan Streator Tonica Triumph Troy Grove Wedron Wenona

All Illinois locations ›

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 Nov 4, 2026.