Hillsboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hillsboro, a city in Montgomery County, Illinois.
Overnight
56°F
Slight Chance Drizzle
A slight chance of drizzle. Mostly cloudy, with a low around 56. Southwest wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for Hillsboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Slight Chance Drizzle | 10 mph SW | 19% |
| Wednesday | 59°F | Slight Chance Drizzle | 8 to 13 mph SW | 15% |
| Wednesday Night | 42°F | Partly Cloudy | 6 mph SW | 1% |
| Thursday | 62°F | Mostly Sunny | 6 to 10 mph W | 0% |
| Thursday Night | 42°F | Mostly Cloudy | 5 mph NW | 0% |
| Friday | 55°F | Partly Sunny | 6 to 9 mph N | 2% |
| Friday Night | 32°F | Partly Cloudy | 1 to 6 mph N | 0% |
| Saturday | 54°F | Mostly Sunny | 3 mph NW | 0% |
| Saturday Night | 31°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 58°F | Sunny | 1 to 6 mph NW | 1% |
| Sunday Night | 32°F | Clear | 2 mph NW | 1% |
| Monday | 64°F | Sunny | 0 to 6 mph SW | 0% |
| Monday Night | 37°F | Clear | 2 mph SW | 0% |
| Tuesday | 67°F | Sunny | 3 mph W | 1% |
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 Nov 4, 2026.