Hillsboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hillsboro, a city in Montgomery County, Illinois.
This Afternoon
95°F
Partly Sunny
Partly sunny, with a high near 95. Southwest wind around 5 mph.
7-day forecast for Hillsboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 95°F | Partly Sunny | 5 mph SW | 14% |
| Tonight | 70°F | Partly Cloudy | 3 mph S | 3% |
| Sunday | 90°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph W | 39% |
| Sunday Night | 62°F | Chance Showers And Thunderstorms | 5 to 9 mph NE | 75% |
| Monday | 76°F | Showers And Thunderstorms | 8 mph NE | 75% |
| Monday Night | 56°F | Chance Showers And Thunderstorms | 5 to 9 mph NE | 36% |
| Tuesday | 69°F | Chance Rain Showers | 7 to 12 mph NE | 31% |
| Tuesday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph N | 16% |
| Wednesday | 72°F | Mostly Sunny | 6 to 9 mph N | 3% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 8 mph N | 1% |
| Thursday | 74°F | Mostly Sunny | 3 to 7 mph N | 2% |
| Thursday Night | 54°F | Partly Cloudy | 2 to 6 mph NE | 3% |
| Friday | 77°F | Mostly Sunny | 2 to 7 mph NE | 4% |
| Friday Night | 54°F | Partly Cloudy | 2 to 6 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Hillsboro (39.176, -89.473). Updated through the day.
Growing snapshot for Hillsboro
Last spring frost
Apr 13
First fall frost
Oct 24
Growing season
192 days
Hardiness zone
6b
More local growing data for Hillsboro: nearby ZIP 62049 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Hillsboro, Il (1.5 mi from Hillsboro). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.