Peru, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Peru, a city in Lasalle County, Illinois.
Tonight
57°F
Rain Showers
Rain showers. Cloudy. Low around 57, with temperatures rising to around 59 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Peru
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Rain Showers | 15 mph S | 89% |
| Wednesday | 60°F | Chance Rain Showers then Mostly Cloudy | 15 mph SW | 32% |
| Wednesday Night | 47°F | Mostly Cloudy | 10 to 15 mph SW | 11% |
| Thursday | 57°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph WSW | 34% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 10 mph NW | 35% |
| Friday | 53°F | Slight Chance Rain Showers | 10 mph N | 18% |
| Friday Night | 35°F | Partly Cloudy | 0 to 5 mph NNW | 2% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 57°F | Mostly Sunny | 0 to 10 mph W | 14% |
| Sunday Night | 36°F | Mostly Clear | 0 to 5 mph W | 4% |
| Monday | 62°F | Sunny | 0 to 10 mph SW | 2% |
| Monday Night | 40°F | Mostly Clear | 5 mph W | 1% |
| Tuesday | 63°F | Sunny | 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Peru (41.349, -89.139). Updated through the day.
Growing snapshot for Peru
Last spring frost
Apr 24
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
5b
More local growing data for Peru: nearby ZIP 61354 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cedar Point
Dana
Dayton
Earlville
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Harding
Kangley
LaSalle
Leland
Leonore
Lostant
Marseilles
Mendota
Millington
Naplate
Newark
North Utica
Oglesby
Ottawa
Ransom
Rutland
Seneca
Serena
Sheridan
Streator
Tonica
Triumph
Troy Grove
Wedron
Wenona
Climate data from the nearest NOAA station, Peru, Il (2.1 mi from Peru). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.