Herrin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Herrin, a city in Williamson County, Illinois.
Tonight
46°F
Partly Cloudy
Partly cloudy, with a low around 46. Southwest wind around 5 mph.
7-day forecast for Herrin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 67°F | Sunny | 3 to 8 mph WSW | 1% |
| Thursday Night | 43°F | Partly Cloudy | 3 mph NW | 1% |
| Friday | 58°F | Partly Sunny | 3 to 12 mph NNW | 1% |
| Friday Night | 33°F | Mostly Clear | 2 to 7 mph N | 0% |
| Saturday | 56°F | Sunny | 2 to 6 mph N | 0% |
| Saturday Night | 32°F | Mostly Clear | 1 mph N | 0% |
| Sunday | 59°F | Sunny | 0 to 6 mph NW | 0% |
| Sunday Night | 34°F | Mostly Clear | 0 mph | 0% |
| Monday | 65°F | Sunny | 0 to 5 mph SSW | 0% |
| Monday Night | 37°F | Clear | 2 mph SW | 1% |
| Tuesday | 66°F | Sunny | 1 to 6 mph W | 0% |
| Tuesday Night | 39°F | Mostly Clear | 1 mph NNW | 3% |
| Veterans Day | 67°F | Mostly Sunny | 0 to 6 mph N | 2% |
Forecast source: National Weather Service (api.weather.gov) for Herrin (37.798, -89.031). Updated through the day.
Growing snapshot for Herrin
Last spring frost
Apr 9
First fall frost
Oct 22
Growing season
195 days
Hardiness zone
7a
More local growing data for Herrin: nearby ZIP 62948 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Blairsville
Bush
Cambria
Carterville
Colp
Crab Orchard
Crainville
Creal Springs
Energy
Freeman Spur
Hurst
Johnston City
Marion
Pittsburg
Spillertown
Whiteash
Climate data from the nearest NOAA station, Carbondale Sewage Plt, Il (9.8 mi from Herrin). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.