Rio, IL Weather & Growing Conditions
This Afternoon
68°F
Light Rain
Rain and a slight chance of thunderstorms. Mostly cloudy, with a high near 68. South southeast wind around 17 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Light Rain | 17 mph SSE | 76% |
| Tonight | 52°F | Light Rain | 12 to 18 mph S | 79% |
| Wednesday | 57°F | Chance Light Rain | 17 mph SW | 26% |
| Wednesday Night | 45°F | Mostly Cloudy | 14 mph SW | 10% |
| Thursday | 56°F | Chance Light Rain | 9 to 15 mph W | 26% |
| Thursday Night | 42°F | Chance Light Rain | 6 to 9 mph NW | 31% |
| Friday | 52°F | Partly Sunny | 7 to 12 mph N | 13% |
| Friday Night | 34°F | Partly Cloudy | 0 to 6 mph NNW | 1% |
| Saturday | 52°F | Partly Sunny | 0 to 6 mph WNW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 3 mph W | 3% |
| Sunday | 59°F | Sunny | 3 to 9 mph W | 11% |
| Sunday Night | 36°F | Mostly Clear | 6 mph W | 3% |
| Monday | 63°F | Sunny | 3 to 12 mph SW | 1% |
| Monday Night | 40°F | Mostly Clear | 7 mph W | 0% |
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 Nov 4, 2026.