Peru, IL Weather & Growing Conditions
Overnight
66°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy. Low around 66, with temperatures rising to around 68 overnight. East southeast wind 5 to 10 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph ESE | 49% |
| Saturday | 81°F | Showers And Thunderstorms Likely | 5 mph ESE | 71% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 mph WSW | 91% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 10 to 15 mph NNE | 65% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 15 mph NE | 46% |
| Monday | 65°F | Rain Showers Likely | 15 mph ENE | 62% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 41% |
| Tuesday | 63°F | Slight Chance Rain Showers | 15 mph NE | 20% |
| Tuesday Night | 51°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 15 mph NNE | 17% |
| Wednesday | 67°F | Mostly Sunny | 10 mph NNE | 4% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 10 mph NNE | 1% |
| Thursday | 69°F | Mostly Sunny | 5 mph NNE | 3% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 3% |
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 Sep 19, 2026.