Potomac, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a village in Vermilion County, Illinois.
This Afternoon
84°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 84. South southeast wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Slight Chance Showers And Thunderstorms | 6 mph SSE | 16% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 6 mph S | 15% |
| Sunday | 80°F | Chance Showers And Thunderstorms | 5 to 12 mph N | 55% |
| Sunday Night | 59°F | Chance Showers And Thunderstorms | 13 mph NE | 53% |
| Monday | 69°F | Showers And Thunderstorms Likely | 13 mph ENE | 57% |
| Monday Night | 54°F | Chance Rain Showers | 12 mph ENE | 40% |
| Tuesday | 67°F | Chance Rain Showers | 12 mph NE | 36% |
| Tuesday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 12 mph NNE | 23% |
| Wednesday | 68°F | Mostly Cloudy | 6 to 9 mph NNE | 10% |
| Wednesday Night | 54°F | Mostly Cloudy | 2 to 9 mph N | 3% |
| Thursday | 71°F | Partly Sunny | 6 mph NNE | 3% |
| Thursday Night | 55°F | Mostly Cloudy | 5 mph NNE | 6% |
| Friday | 74°F | Partly Sunny | 2 to 6 mph NNE | 6% |
| Friday Night | 53°F | Partly Cloudy | 5 mph NE | 4% |
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 Sep 19, 2026.