Hillsboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hillsboro, a city in Montgomery County, Illinois.
This Afternoon
93°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 93. Heat index values as high as 101. East wind around 3 mph. Chance of precipitation is 30%.
7-day forecast for Hillsboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 93°F | Chance Showers And Thunderstorms | 3 mph E | 25% |
| Tonight | 69°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 mph SE | 23% |
| Saturday | 95°F | Mostly Sunny | 6 mph SW | 7% |
| Saturday Night | 70°F | Partly Cloudy | 3 mph S | 7% |
| Sunday | 90°F | Chance Rain Showers | 1 to 6 mph NW | 28% |
| Sunday Night | 62°F | Showers And Thunderstorms Likely | 7 mph NE | 58% |
| Monday | 76°F | Showers And Thunderstorms Likely | 6 to 10 mph NE | 61% |
| Monday Night | 56°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 60% |
| Tuesday | 71°F | Chance Rain Showers then Mostly Cloudy | 10 mph NE | 27% |
| Tuesday Night | 51°F | Mostly Cloudy | 3 to 10 mph N | 4% |
| Wednesday | 73°F | Mostly Sunny | 5 to 8 mph N | 3% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 7 mph N | 3% |
| Thursday | 75°F | Mostly Sunny | 2 to 7 mph N | 3% |
| Thursday Night | 54°F | Partly Cloudy | 2 to 6 mph N | 4% |
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 18, 2026.