Onarga, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Onarga, a village in Iroquois County, Illinois.

Tonight

64°F

Partly Cloudy

Partly cloudy, with a low around 64. East southeast wind 5 to 10 mph. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Onarga

When	Temp	Forecast	Wind	Precip
Tonight	64°F	Partly Cloudy	5 to 10 mph ESE	14%
Saturday	84°F	Chance Showers And Thunderstorms	5 to 10 mph SSE	49%
Saturday Night	68°F	Chance Showers And Thunderstorms	5 mph SSW	60%
Sunday	76°F	Showers And Thunderstorms Likely	5 to 10 mph NNE	70%
Sunday Night	56°F	Showers And Thunderstorms Likely	10 mph NE	67%
Monday	67°F	Showers And Thunderstorms Likely	10 mph ENE	67%
Monday Night	51°F	Chance Showers And Thunderstorms	10 mph NE	40%
Tuesday	66°F	Slight Chance Rain Showers	10 mph NE	24%
Tuesday Night	51°F	Mostly Cloudy	5 to 10 mph NNE	13%
Wednesday	68°F	Partly Sunny	5 to 10 mph NNE	7%
Wednesday Night	52°F	Mostly Cloudy	0 to 5 mph NNE	7%
Thursday	71°F	Partly Sunny	0 to 5 mph NNE	4%
Thursday Night	53°F	Partly Cloudy	0 to 5 mph NNE	4%
Friday	72°F	Mostly Sunny	0 to 5 mph NNE	4%

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

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

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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 Sep 19, 2026.