Hartsburg, IL Weather & Growing Conditions
This Afternoon
84°F
Mostly Sunny
Mostly sunny. High near 84, with temperatures falling to around 78 in the afternoon. East wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Mostly Sunny | 9 mph E | 3% |
| Tonight | 71°F | Partly Cloudy | 9 mph ESE | 4% |
| Saturday | 90°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph SSW | 17% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 6 mph SSE | 35% |
| Sunday | 82°F | Showers And Thunderstorms Likely | 3 to 13 mph N | 61% |
| Sunday Night | 60°F | Showers And Thunderstorms Likely | 10 to 14 mph NE | 63% |
| Monday | 69°F | Showers And Thunderstorms Likely | 14 mph ENE | 63% |
| Monday Night | 55°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 48% |
| Tuesday | 67°F | Chance Rain Showers | 13 mph NE | 25% |
| Tuesday Night | 52°F | Mostly Cloudy | 6 to 12 mph NNE | 5% |
| Wednesday | 70°F | Partly Sunny | 9 mph NNE | 4% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 9 mph NNE | 1% |
| Thursday | 71°F | Mostly Sunny | 5 to 8 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 3 to 7 mph NNE | 4% |
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 Sep 19, 2026.