Oregon, IL Weather & Growing Conditions
Overnight
62°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 62. East southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Chance Showers And Thunderstorms | 5 to 10 mph ESE | 53% |
| Saturday | 78°F | Showers And Thunderstorms Likely | 5 to 10 mph SSE | 88% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NNE | 78% |
| Sunday | 68°F | Showers And Thunderstorms | 10 to 15 mph NE | 77% |
| Sunday Night | 53°F | Rain Showers Likely | 10 to 15 mph NE | 61% |
| Monday | 64°F | Chance Rain Showers | 10 to 15 mph ENE | 48% |
| Monday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 36% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 10 mph NE | 8% |
| Wednesday | 66°F | Partly Sunny | 5 to 10 mph NE | 4% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 68°F | Mostly Sunny | 0 to 5 mph NNE | 5% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Oregon, IL
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5b
Explore more for Oregon, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Polo 5Nw, Il (13.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.