Iroquois, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iroquois, a village in Iroquois County, Illinois.
Today
83°F
Patchy Fog then Mostly Sunny
Patchy fog before 8am. Mostly sunny, with a high near 83. South wind 0 to 5 mph.
7-day forecast for Iroquois
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Patchy Fog then Mostly Sunny | 0 to 5 mph S | 0% |
| Tonight | 62°F | Partly Cloudy | 0 mph | 0% |
| Wednesday | 83°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SSW | 17% |
| Wednesday Night | 65°F | Chance Showers And Thunderstorms | 0 mph | 80% |
| Thursday | 80°F | Showers And Thunderstorms | 0 to 5 mph SSW | 80% |
| Thursday Night | 62°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 mph | 55% |
| Friday | 82°F | Partly Sunny | 0 mph | 11% |
| Friday Night | 63°F | Slight Chance Showers And Thunderstorms | 0 mph | 18% |
| Saturday | 83°F | Mostly Sunny | 0 to 5 mph SSW | 12% |
| Saturday Night | 67°F | Partly Cloudy | 0 to 5 mph SSW | 9% |
| Sunday | 86°F | Sunny | 5 to 10 mph SW | 10% |
| Sunday Night | 69°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 23% |
| Monday | 86°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 23% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 mph SW | 38% |
Forecast source: National Weather Service (api.weather.gov) for Iroquois (40.829, -87.584). Updated through the day.
Growing snapshot for Iroquois
Last spring frost
Apr 24
First fall frost
Oct 16
Growing season
174 days
Hardiness zone
5b
More local growing data for Iroquois: nearby ZIP 60945 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Cissna Park
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Onarga
Papineau
Sheldon
Thawville
Watseka
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Woodland
Climate data from the nearest NOAA station, Watseka 2 Nw, Il (8.7 mi from Iroquois). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.