Hartsburg, IL Weather & Growing Conditions
Tonight
53°F
Rain
Rain before 3am, then a slight chance of rain showers. Cloudy, with a low around 53. South wind 12 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Rain | 12 to 16 mph S | 95% |
| Wednesday | 60°F | Mostly Cloudy | 15 mph SW | 14% |
| Wednesday Night | 44°F | Mostly Cloudy | 8 to 12 mph SW | 1% |
| Thursday | 60°F | Mostly Sunny | 9 to 14 mph WSW | 6% |
| Thursday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 5 to 8 mph NW | 23% |
| Friday | 55°F | Mostly Cloudy | 7 to 12 mph NNW | 14% |
| Friday Night | 35°F | Partly Cloudy | 2 to 9 mph N | 5% |
| Saturday | 54°F | Mostly Sunny | 2 to 6 mph NW | 2% |
| Saturday Night | 34°F | Partly Cloudy | 3 mph W | 2% |
| Sunday | 60°F | Sunny | 2 to 9 mph W | 11% |
| Sunday Night | 34°F | Mostly Clear | 3 to 7 mph W | 6% |
| Monday | 65°F | Sunny | 3 to 10 mph SW | 2% |
| Monday Night | 39°F | Mostly Clear | 3 to 8 mph WSW | 2% |
| Tuesday | 67°F | Sunny | 3 to 7 mph WNW | 1% |
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 Nov 4, 2026.