Gilman, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gilman, a city in Iroquois County, Illinois.
Today
84°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 10am, then showers and thunderstorms between 10am and 11am, then showers and thunderstorms likely between 11am and 3pm. Cloudy. High near 84, with temperatures falling to around 81 in the afternoon. East southeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Gilman
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Showers And Thunderstorms Likely | 5 mph ESE | 77% |
| Tonight | 66°F | Chance Showers And Thunderstorms | 0 to 5 mph SSW | 55% |
| Sunday | 75°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 10 mph N | 83% |
| Sunday Night | 56°F | Chance Showers And Thunderstorms | 10 mph NE | 52% |
| Monday | 67°F | Showers And Thunderstorms Likely | 10 mph ENE | 58% |
| Monday Night | 51°F | Chance Rain Showers | 5 to 10 mph NE | 45% |
| Tuesday | 66°F | Chance Rain Showers | 10 mph NE | 30% |
| Tuesday Night | 51°F | Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 10 mph NNE | 30% |
| Wednesday | 68°F | Partly Sunny | 5 to 10 mph NNE | 7% |
| Wednesday Night | 52°F | Mostly Cloudy | 5 mph NNE | 3% |
| Thursday | 70°F | Partly Sunny | 5 mph NNE | 2% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph NNE | 2% |
| Friday | 73°F | Mostly Sunny | 0 to 5 mph NNE | 2% |
| Friday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Gilman (40.761, -88.001). Updated through the day.
Growing snapshot for Gilman
Last spring frost
Apr 25
First fall frost
Oct 20
Growing season
175 days
Hardiness zone
5b
More local growing data for Gilman: nearby ZIP 60938 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Piper City, Il (10.4 mi from Gilman). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.