Peru, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Peru, a city in Lasalle County, Illinois.
This Afternoon
75°F
Slight Chance Rain Showers
A slight chance of rain showers before 5pm. Partly sunny, with a high near 75. 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 Peru
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°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 SSE | 59% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely | 5 mph NNW | 79% |
| Sunday | 71°F | Showers And Thunderstorms | 10 to 15 mph NNE | 79% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 15 mph NE | 71% |
| Monday | 65°F | Showers And Thunderstorms Likely | 15 mph ENE | 62% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 40% |
| Tuesday | 64°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 15 mph NNE | 7% |
| Wednesday | 68°F | Partly Sunny | 5 to 10 mph NNE | 5% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 10 mph NNE | 5% |
| Thursday | 69°F | Mostly Sunny | 5 mph NNE | 3% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NNE | 4% |
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
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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 Sep 19, 2026.