Hillsboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hillsboro, a city in Montgomery County, Illinois.
Today
85°F
Sunny
Sunny, with a high near 85. South wind around 2 mph.
7-day forecast for Hillsboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 2 mph S | 0% |
| Tonight | 64°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 87°F | Mostly Sunny | 1 to 5 mph S | 12% |
| Wednesday Night | 68°F | Slight Chance Showers And Thunderstorms | 3 mph S | 68% |
| Thursday | 83°F | Showers And Thunderstorms | 5 mph SW | 77% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms | 2 mph S | 36% |
| Friday | 84°F | Chance Showers And Thunderstorms then Partly Sunny | 3 mph SW | 29% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 2 mph SW | 26% |
| Saturday | 86°F | Chance Showers And Thunderstorms then Mostly Sunny | 3 mph S | 26% |
| Saturday Night | 69°F | Mostly Clear | 5 mph S | 11% |
| Sunday | 89°F | Sunny | 5 to 8 mph S | 6% |
| Sunday Night | 71°F | Mostly Clear | 7 mph S | 5% |
| Monday | 90°F | Mostly Sunny | 5 to 8 mph SW | 9% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 7 mph S | 20% |
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 Aug 4, 2026.