Osco, IL Weather & Growing Conditions
Overnight
68°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 4am, then patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 68, with temperatures rising to around 70 overnight. Southeast wind around 10 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Slight Chance Showers And Thunderstorms | 10 mph SE | 29% |
| Saturday | 82°F | Patchy Fog | 5 to 10 mph SE | 73% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 91% |
| Sunday | 71°F | Patchy Fog | 10 to 15 mph NE | 75% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 15 to 20 mph NE | 49% |
| Monday | 64°F | Rain Showers Likely | 15 mph NE | 63% |
| Monday Night | 53°F | Chance Rain Showers | 15 mph NE | 48% |
| Tuesday | 62°F | Slight Chance Rain Showers | 15 mph NE | 23% |
| Tuesday Night | 49°F | Partly Cloudy | 5 to 15 mph NE | 8% |
| Wednesday | 66°F | Mostly Sunny | 10 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 5 to 10 mph NE | 5% |
| Thursday Night | 54°F | Partly Cloudy | 5 mph NE | 4% |
| Friday | 72°F | Mostly Sunny | 5 to 10 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Osco, IL
Last spring frost
Apr 20
First fall frost
Oct 20
Growing season
180 days
Hardiness zone
5b
Explore more for Osco, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Geneseo, Il (8.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.