Hartsburg, IL Weather & Growing Conditions
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 6 mph S | 0% |
| Tonight | 67°F | Partly Cloudy | 5 mph SSE | 3% |
| Wednesday | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph S | 26% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph SSE | 79% |
| Thursday | 81°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 mph SSW | 79% |
| Thursday Night | 65°F | Slight Chance Showers And Thunderstorms | 1 to 5 mph SSE | 18% |
| Friday | 83°F | Mostly Sunny | 3 mph SSW | 7% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 2 mph S | 25% |
| Saturday | 86°F | Mostly Sunny | 3 to 7 mph SSW | 12% |
| Saturday Night | 70°F | Mostly Clear | 6 mph S | 10% |
| Sunday | 89°F | Sunny | 7 to 12 mph SSW | 7% |
| Sunday Night | 72°F | Partly Cloudy | 7 to 10 mph SSW | 14% |
| Monday | 89°F | Mostly Sunny | 7 to 10 mph SSW | 14% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 27% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Hartsburg, IL
Last spring frost
Apr 20
First fall frost
Oct 16
Growing season
179 days
Hardiness zone
6a
Explore more for Hartsburg, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Lincoln, Il (8.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.