Onarga, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onarga, a village in Iroquois County, Illinois.
This Afternoon
75°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. High near 75, with temperatures falling to around 71 in the afternoon. South wind around 20 mph, with gusts as high as 35 mph. Chance of precipitation is 30%.
7-day forecast for Onarga
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Chance Rain Showers | 20 mph S | 27% |
| Tonight | 59°F | Rain Showers | 15 to 20 mph SSE | 81% |
| Wednesday | 64°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph SSW | 42% |
| Wednesday Night | 46°F | Mostly Cloudy | 10 mph SW | 4% |
| Thursday | 61°F | Partly Sunny | 10 to 15 mph WSW | 5% |
| Thursday Night | 42°F | Mostly Cloudy then Chance Rain Showers | 0 to 5 mph WNW | 25% |
| Friday | 56°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NNW | 22% |
| Friday Night | 34°F | Mostly Cloudy | 0 to 5 mph NNW | 8% |
| Saturday | 54°F | Mostly Sunny | 0 to 5 mph WNW | 4% |
| Saturday Night | 31°F | Partly Cloudy | 0 mph | 3% |
| Sunday | 60°F | Mostly Sunny | 0 to 5 mph W | 10% |
| Sunday Night | 32°F | Mostly Clear | 0 to 5 mph WNW | 10% |
| Monday | 64°F | Sunny | 0 to 10 mph WSW | 4% |
| Monday Night | 37°F | Mostly Clear | 5 mph WSW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Onarga (40.715, -88.011). Updated through the day.
Growing snapshot for Onarga
Last spring frost
Apr 25
First fall frost
Oct 20
Growing season
175 days
Hardiness zone
5b
More local growing data for Onarga: nearby ZIP 60955 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Ashkum
Beaverville
Buckley
Cissna Park
Clifton
Crescent City
Danforth
Donovan
Gilman
Iroquois
Loda
Martinton
Milford
Papineau
Sheldon
Thawville
Watseka
Wellington
Woodland
Climate data from the nearest NOAA station, Piper City, Il (11 mi from Onarga). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.