Peru, IL Weather & Growing Conditions
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
| 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). Updated through the day.
Growing snapshot for Peru, IL
Last spring frost
Apr 24
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
5b
Explore more for Peru, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Peru, Il (2.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.