Onarga, IL Weather & Growing Conditions
This Afternoon
78°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 2pm. Mostly cloudy, with a high near 78. Southeast wind around 5 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 15% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 43% |
| Sunday | 76°F | Showers And Thunderstorms | 0 to 10 mph NNE | 76% |
| Sunday Night | 56°F | Showers And Thunderstorms Likely | 10 mph NE | 68% |
| Monday | 67°F | Rain Showers Likely | 10 mph ENE | 57% |
| Monday Night | 52°F | Chance Rain Showers | 5 to 10 mph ENE | 34% |
| Tuesday | 65°F | Chance Rain Showers | 10 mph NE | 47% |
| Tuesday Night | 51°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 25% |
| Wednesday | 67°F | Mostly Cloudy | 5 to 10 mph NNE | 12% |
| Wednesday Night | 52°F | Mostly Cloudy | 5 mph NNE | 3% |
| Thursday | 70°F | Partly Sunny | 5 mph NNE | 2% |
| Thursday Night | 53°F | Mostly Cloudy | 0 to 5 mph NNE | 6% |
| Friday | 74°F | Partly Sunny | 0 to 5 mph NNE | 6% |
| Friday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Onarga, IL
Last spring frost
Apr 25
First fall frost
Oct 20
Growing season
175 days
Hardiness zone
5b
Explore more for Onarga, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Piper City, Il (11 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.