Herrin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Herrin, a city in Williamson County, Illinois.
Overnight
64°F
Patchy Fog
Patchy fog. Mostly clear. Low around 64, with temperatures rising to around 66 overnight. Wind around 0 mph.
7-day forecast for Herrin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 64°F | Patchy Fog | 0 mph | 0% |
| Tuesday | 89°F | Patchy Fog then Sunny | 0 to 3 mph E | 0% |
| Tuesday Night | 64°F | Mostly Clear | 0 to 3 mph E | 0% |
| Wednesday | 91°F | Sunny | 2 mph SSW | 0% |
| Wednesday Night | 70°F | Mostly Clear | 2 mph S | 4% |
| Thursday | 91°F | Chance Showers And Thunderstorms | 2 to 7 mph SSW | 27% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 1 to 6 mph SSE | 58% |
| Friday | 90°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 6 mph SSW | 58% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 3 mph SSW | 39% |
| Saturday | 91°F | Chance Showers And Thunderstorms | 2 to 6 mph SSW | 39% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SSW | 17% |
| Sunday | 93°F | Mostly Sunny | 2 to 9 mph SSW | 7% |
| Sunday Night | 73°F | Mostly Clear | 5 to 9 mph SSW | 5% |
| Monday | 94°F | Sunny | 5 to 10 mph SSW | 5% |
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
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Cambria
Carterville
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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 Aug 4, 2026.