Harrison, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrison, a community in Jackson County, Illinois.
Overnight
71°F
Mostly Clear
Mostly clear. Low around 71, with temperatures rising to around 74 overnight. South southeast wind around 2 mph.
7-day forecast for Harrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 71°F | Mostly Clear | 2 mph SSE | 1% |
| Saturday | 98°F | Sunny | 2 to 7 mph SW | 2% |
| Saturday Night | 72°F | Mostly Clear | 5 mph SSW | 2% |
| Sunday | 95°F | Mostly Sunny | 6 mph WSW | 1% |
| Sunday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 3 mph NNW | 32% |
| Monday | 84°F | Showers And Thunderstorms Likely | 5 to 8 mph NNE | 62% |
| Monday Night | 61°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 to 9 mph NNE | 62% |
| Tuesday | 74°F | Slight Chance Showers And Thunderstorms | 7 to 10 mph N | 20% |
| Tuesday Night | 56°F | Partly Cloudy | 3 to 10 mph N | 10% |
| Wednesday | 75°F | Mostly Sunny | 6 to 9 mph N | 1% |
| Wednesday Night | 55°F | Partly Cloudy | 2 to 8 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 3 to 8 mph N | 2% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 6 mph NNE | 4% |
| Friday | 77°F | Mostly Sunny | 3 to 8 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Harrison (37.798, -89.336). Updated through the day.
Growing snapshot for Harrison
Last spring frost
Apr 9
First fall frost
Oct 22
Growing season
195 days
Hardiness zone
7a
More local growing data for Harrison: nearby ZIP 62966 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Ava
Campbell Hill
Carbondale
De Soto
Dowell
Elkville
Gorham
Grand Tower
Makanda
Murphysboro
Rockwood
Vergennes
Climate data from the nearest NOAA station, Carbondale Southern Il Ap, Il (5.7 mi from Harrison). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.