Rio, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rio, a village in Knox County, Illinois.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. South wind 6 to 9 mph.
7-day forecast for Rio
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 6 to 9 mph S | 0% |
| Tonight | 67°F | Chance Showers And Thunderstorms | 6 mph SE | 63% |
| Wednesday | 79°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 mph WSW | 67% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 6 mph N | 80% |
| Thursday | 80°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph NNE | 57% |
| Thursday Night | 62°F | Mostly Clear | 0 to 3 mph E | 7% |
| Friday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 mph SSE | 15% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 mph SSE | 15% |
| Saturday | 85°F | Sunny | 3 to 7 mph SSW | 9% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 6 to 10 mph S | 15% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Sunny | 9 to 14 mph SSW | 15% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph S | 30% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 8 to 13 mph SSW | 30% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 12 mph SSW | 32% |
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 Aug 4, 2026.