Rio, IL Weather & Growing Conditions
Tonight
68°F
Partly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 68. East southeast wind 8 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 8 to 12 mph ESE | 42% |
| Saturday | 84°F | Chance Showers And Thunderstorms | 9 mph SSE | 54% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 8 mph N | 76% |
| Sunday | 73°F | Showers And Thunderstorms Likely | 7 to 15 mph NE | 74% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 13 to 16 mph NE | 66% |
| Monday | 64°F | Showers And Thunderstorms Likely | 17 mph ENE | 64% |
| Monday Night | 53°F | Chance Rain Showers | 12 to 16 mph NE | 47% |
| Tuesday | 63°F | Chance Rain Showers | 15 mph NE | 35% |
| Tuesday Night | 49°F | Mostly Cloudy | 5 to 12 mph NNE | 5% |
| Wednesday | 67°F | Mostly Sunny | 9 mph NNE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 6 mph NNE | 4% |
| Thursday Night | 54°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 70°F | Mostly Sunny | 2 to 7 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rio, IL
Last spring frost
Apr 20
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
Explore more for Rio, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Galesburg, Il (10.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.