Pecatonica, IL Weather & Growing Conditions
Tonight
61°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely after 11pm. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 61. 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 | 61°F | Showers And Thunderstorms Likely | 10 to 15 mph ESE | 73% |
| Saturday | 77°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph SE | 93% |
| Saturday Night | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 74% |
| Sunday | 66°F | Showers And Thunderstorms Likely | 10 to 20 mph NE | 66% |
| Sunday Night | 52°F | Chance Rain Showers | 15 mph ENE | 46% |
| Monday | 64°F | Chance Rain Showers | 15 to 20 mph ENE | 42% |
| Monday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 42% |
| Tuesday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Tuesday Night | 46°F | Mostly Cloudy | 5 to 15 mph NE | 9% |
| Wednesday | 66°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Wednesday Night | 47°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Thursday | 67°F | Mostly Sunny | 5 mph NNE | 5% |
| Thursday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 70°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 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 Sep 19, 2026.