Rio, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rio, a village in Knox County, Illinois.
Overnight
68°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southeast wind around 7 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Rio
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Slight Chance Showers And Thunderstorms | 7 mph SSE | 23% |
| Saturday | 84°F | Chance Showers And Thunderstorms | 9 mph SE | 44% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely | 6 mph WSW | 89% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 6 to 16 mph NNE | 72% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 14 to 17 mph NE | 55% |
| Monday | 64°F | Showers And Thunderstorms Likely | 17 mph ENE | 65% |
| Monday Night | 52°F | Chance Rain Showers | 13 to 16 mph NE | 51% |
| Tuesday | 62°F | Chance Rain Showers | 13 to 16 mph NE | 37% |
| Tuesday Night | 48°F | Partly Cloudy | 7 to 13 mph NE | 8% |
| Wednesday | 66°F | Mostly Sunny | 10 mph NNE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 3 to 7 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 7 mph NE | 6% |
| Thursday Night | 54°F | Partly Cloudy | 6 mph NE | 4% |
| Friday | 72°F | Mostly Sunny | 5 to 8 mph ENE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Rio (41.109, -90.399). Updated through the day.
Growing snapshot for Rio
Last spring frost
Apr 20
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
More local growing data for Rio: nearby ZIP 61472 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Abingdon
Altona
East Galesburg
Galesburg
Gilson
Henderson
Knoxville
Maquon
Nekoma
Oak Run
Oneida
St. Augustine
Victoria
Wataga
Williamsfield
Yates City
Climate data from the nearest NOAA station, Galesburg, Il (10.8 mi from Rio). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.