Harrison, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrison, a community in Jackson County, Illinois.
This Afternoon
77°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 3pm and 5pm, then a chance of showers and thunderstorms. Partly sunny. High near 77, with temperatures falling to around 74 in the afternoon. South wind 16 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
7-day forecast for Harrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Slight Chance Showers And Thunderstorms | 16 to 20 mph S | 48% |
| Tonight | 55°F | Showers And Thunderstorms | 7 to 15 mph SSW | 98% |
| Wednesday | 69°F | Partly Sunny | 5 to 9 mph WSW | 6% |
| Wednesday Night | 43°F | Partly Cloudy | 3 mph SW | 0% |
| Thursday | 71°F | Sunny | 2 to 8 mph SSW | 2% |
| Thursday Night | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 3 mph WSW | 18% |
| Friday | 64°F | Partly Sunny | 3 to 9 mph NW | 3% |
| Friday Night | 41°F | Partly Cloudy | 5 mph NNW | 0% |
| Saturday | 61°F | Partly Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 1 mph NNW | 2% |
| Sunday | 63°F | Mostly Sunny | 1 to 8 mph WNW | 4% |
| Sunday Night | 35°F | Mostly Clear | 3 mph WNW | 5% |
| Monday | 63°F | Sunny | 2 to 7 mph WSW | 3% |
| Monday Night | 36°F | Clear | 2 mph SW | 2% |
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 Nov 3, 2026.