Rio, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rio, a village in Knox County, Illinois.
This Afternoon
77°F
Mostly Sunny
Mostly sunny, with a high near 77. East southeast wind around 10 mph, with gusts as high as 17 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Rio
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Mostly Sunny | 10 mph ESE | 2% |
| Tonight | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 8 to 12 mph ESE | 44% |
| Saturday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 mph SSE | 55% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 8 mph N | 76% |
| Sunday | 73°F | Showers And Thunderstorms Likely | 7 to 15 mph NE | 74% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely | 16 mph NE | 66% |
| Monday | 64°F | Showers And Thunderstorms Likely | 17 mph ENE | 63% |
| Monday Night | 53°F | Chance Rain Showers | 13 to 16 mph NE | 48% |
| Tuesday | 63°F | Chance Rain Showers | 15 mph NE | 36% |
| 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 | 2% |
| Thursday | 68°F | Mostly Sunny | 6 mph NNE | 4% |
| Thursday Night | 54°F | Partly Cloudy | 5 mph NE | 5% |
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.