Potomac, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a village in Vermilion County, Illinois.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. South wind around 5 mph.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 5 mph S | 0% |
| Tonight | 65°F | Mostly Clear | 3 mph SSE | 0% |
| Wednesday | 85°F | Mostly Sunny | 2 to 6 mph S | 5% |
| Wednesday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 65% |
| Thursday | 82°F | Showers And Thunderstorms | 5 mph SSW | 78% |
| Thursday Night | 65°F | Chance Showers And Thunderstorms | 0 to 3 mph S | 50% |
| Friday | 83°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 2 mph S | 23% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 1 mph SSW | 25% |
| Saturday | 85°F | Slight Chance Rain Showers then Mostly Sunny | 1 to 5 mph SSW | 15% |
| Saturday Night | 69°F | Mostly Clear | 2 to 6 mph SSW | 12% |
| Sunday | 87°F | Sunny | 6 to 10 mph SSW | 9% |
| Sunday Night | 71°F | Partly Cloudy | 8 mph SSW | 14% |
| Monday | 87°F | Slight Chance Showers And Thunderstorms | 9 mph SW | 21% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 8 mph SW | 31% |
Forecast source: National Weather Service (api.weather.gov) for Potomac (40.307, -87.798). Updated through the day.
Growing snapshot for Potomac
Last spring frost
Apr 22
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
6a
More local growing data for Potomac: nearby ZIP 61865 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Allerton
Alvan (Alvin)
Belgium
Bismarck
Catlin
Danville
East Lynn
Fairmount
Fithian
Georgetown
Henning
Hoopeston
Indianola
Muncie
Oakwood
Olivet
Rankin
Ridge Farm
Rossville
Sidell
Tilton
Westville
Climate data from the nearest NOAA station, Hoopeston, Il (12.9 mi from Potomac). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.