Osco, IL Weather & Growing Conditions
Today
86°F
Mostly Sunny
Mostly sunny. High near 86, with temperatures falling to around 84 in the afternoon. Southwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 10 mph SW | 3% |
| Tonight | 68°F | Showers And Thunderstorms Likely | 5 mph E | 59% |
| Wednesday | 79°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph N | 78% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 5 mph N | 79% |
| Thursday | 79°F | Slight Chance Showers And Thunderstorms | 5 mph NE | 53% |
| Thursday Night | 62°F | Mostly Clear | 0 to 5 mph E | 14% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SE | 8% |
| Friday Night | 65°F | Mostly Clear | 5 mph S | 10% |
| Saturday | 84°F | Sunny | 5 to 10 mph SW | 9% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 15 mph S | 15% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Sunny | 15 mph SW | 15% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 33% |
| Monday | 85°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 33% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 to 15 mph SW | 34% |
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 Aug 4, 2026.