Pecatonica, IL Weather & Growing Conditions
Tonight
62°F
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before midnight, then a chance of showers and thunderstorms between midnight and 1am, then showers and thunderstorms likely. Some of the storms could produce heavy rain. Cloudy, with a low around 62. East southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 62°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 to 15 mph ESE | 68% |
| Saturday | 77°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 15 mph SE | 93% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NNE | 75% |
| Sunday | 67°F | Showers And Thunderstorms Likely | 10 to 20 mph NE | 69% |
| Sunday Night | 53°F | Chance Rain Showers | 15 to 20 mph NE | 49% |
| Monday | 63°F | Chance Rain Showers | 15 to 20 mph ENE | 42% |
| Monday Night | 48°F | Chance Rain Showers | 10 to 20 mph NE | 42% |
| Tuesday | 62°F | Chance Rain Showers | 15 mph NE | 31% |
| Tuesday Night | 46°F | Mostly Cloudy | 5 to 15 mph NE | 9% |
| Wednesday | 65°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Wednesday Night | 48°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 67°F | Mostly Sunny | 5 mph NNE | 5% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Pecatonica, IL
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
174 days
Hardiness zone
5b
Explore more for Pecatonica, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Rockford Gtr Rockford Ap, Il (13.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.