Peru, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Peru, a city in Lasalle County, Illinois.
This Afternoon
70°F
Rain Likely
Rain likely and a slight chance of thunderstorms. Mostly cloudy. High near 70, with temperatures falling to around 67 in the afternoon. South wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Peru
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Rain Likely | 15 to 20 mph S | 74% |
| Tonight | 57°F | Rain | 15 mph S | 89% |
| Wednesday | 60°F | Chance Rain 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 | 10 to 15 mph WSW | 34% |
| Thursday Night | 43°F | Chance Rain | 5 to 10 mph NW | 35% |
| Friday | 53°F | Slight Chance Rain | 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% |
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
Grand Ridge
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 3, 2026.