Pecatonica, IL Weather & Growing Conditions
Tonight
56°F
Rain
Rain. Cloudy. Low around 56, with temperatures rising to around 60 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Rain | 15 mph S | 83% |
| Wednesday | 59°F | Chance Rain then Chance Rain Showers | 15 mph SSW | 41% |
| Wednesday Night | 45°F | Chance Rain Showers | 15 mph SW | 30% |
| Thursday | 54°F | Rain Showers Likely | 10 to 15 mph WSW | 57% |
| Thursday Night | 39°F | Chance Rain Showers | 5 to 10 mph NNW | 29% |
| Friday | 50°F | Partly Sunny | 10 to 15 mph N | 14% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph NNW | 2% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 2% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph WSW | 4% |
| Sunday | 58°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 15% |
| Sunday Night | 32°F | Mostly Clear | 5 to 10 mph W | 4% |
| Monday | 61°F | Sunny | 5 to 15 mph SW | 1% |
| Monday Night | 37°F | Mostly Clear | 5 to 10 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 to 10 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Pecatonica, IL
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5b
Explore more for Pecatonica, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (13.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.