Potomac, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a village in Vermilion County, Illinois.
Today
86°F
Showers And Thunderstorms then Chance Showers And Thunderstorms
Showers and thunderstorms before noon, then a chance of showers and thunderstorms between noon and 3pm. Mostly cloudy, with a high near 86. East southeast wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 mph ESE | 79% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 3 mph SSW | 30% |
| Sunday | 79°F | Chance Showers And Thunderstorms | 2 to 10 mph N | 70% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 12 mph NE | 66% |
| Monday | 68°F | Showers And Thunderstorms Likely | 14 mph ENE | 63% |
| Monday Night | 53°F | Chance Rain Showers | 9 to 14 mph NE | 43% |
| Tuesday | 67°F | Chance Rain Showers | 12 mph NE | 36% |
| Tuesday Night | 52°F | Chance Showers And Thunderstorms then Mostly Cloudy | 6 to 12 mph NNE | 36% |
| Wednesday | 69°F | Partly Sunny | 9 mph NNE | 7% |
| Wednesday Night | 53°F | Mostly Cloudy | 3 to 8 mph NNE | 6% |
| Thursday | 71°F | Partly Sunny | 5 to 8 mph NNE | 3% |
| Thursday Night | 54°F | Mostly Cloudy | 2 to 7 mph NNE | 3% |
| Friday | 73°F | Mostly Sunny | 3 to 7 mph NNE | 2% |
| Friday Night | 53°F | Partly Cloudy | 2 to 6 mph NE | 2% |
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.