Peru, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Peru, a city in Lasalle County, Illinois.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. South southwest wind 5 to 10 mph.
7-day forecast for Peru
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph S | 20% |
| Wednesday | 80°F | Chance Showers And Thunderstorms | 5 mph SW | 57% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph N | 87% |
| Thursday | 79°F | Chance Showers And Thunderstorms | 5 mph E | 63% |
| Thursday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 24% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SSE | 9% |
| Friday Night | 65°F | Mostly Clear | 0 mph | 9% |
| Saturday | 85°F | Mostly Sunny | 0 to 5 mph SSW | 9% |
| Saturday Night | 70°F | Mostly Clear | 5 to 10 mph SSW | 11% |
| Sunday | 87°F | Mostly Sunny | 10 mph SW | 11% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 30% |
| Monday | 86°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 30% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph SW | 37% |
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
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Millington
Naplate
Newark
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Seneca
Serena
Sheridan
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Tonica
Triumph
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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 Aug 4, 2026.