Pecatonica, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pecatonica, a village in Winnebago County, Illinois.
Overnight
63°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 63. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Pecatonica
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Showers And Thunderstorms | 10 mph E | 100% |
| Saturday | 77°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph SSE | 100% |
| Saturday Night | 60°F | Showers And Thunderstorms | 5 to 10 mph ENE | 92% |
| Sunday | 68°F | Chance Showers And Thunderstorms | 15 mph NE | 53% |
| Sunday Night | 52°F | Slight Chance Rain Showers | 15 mph NE | 23% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 41% |
| Monday Night | 47°F | Slight Chance Rain Showers | 10 to 15 mph NE | 20% |
| Tuesday | 62°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph NE | 15% |
| Tuesday Night | 46°F | Partly Cloudy | 5 to 15 mph NE | 7% |
| Wednesday | 65°F | Mostly Sunny | 10 to 15 mph NE | 3% |
| Wednesday Night | 48°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 67°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Thursday Night | 49°F | Mostly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 70°F | Mostly Sunny | 5 to 10 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Pecatonica (42.309, -89.357). Updated through the day.
Growing snapshot for Pecatonica
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5b
More local growing data for Pecatonica: nearby ZIP 61063 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cherry Valley
Durand
Loves Park
Machesney Park
New Milford
Rockford
Rockton
Roscoe
South Beloit
Westlake Village
Winnebago
Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (13.5 mi from Pecatonica). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.