Potomac, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a village in Vermilion County, Illinois.
Overnight
60°F
Light Rain Likely
Rain likely. Cloudy, with a low around 60. South wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Light Rain Likely | 15 mph S | 67% |
| Wednesday | 64°F | Chance Light Rain then Patchy Drizzle | 12 to 15 mph SW | 38% |
| Wednesday Night | 47°F | Patchy Drizzle then Mostly Cloudy | 10 mph SW | 10% |
| Thursday | 61°F | Partly Sunny then Slight Chance Light Rain | 10 to 15 mph WSW | 17% |
| Thursday Night | 43°F | Chance Light Rain | 2 to 6 mph WNW | 30% |
| Friday | 54°F | Slight Chance Light Rain then Mostly Cloudy | 9 mph NNW | 15% |
| Friday Night | 34°F | Partly Cloudy | 2 to 7 mph NNW | 0% |
| Saturday | 53°F | Sunny | 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 2 mph WNW | 1% |
| Sunday | 59°F | Sunny | 1 to 7 mph W | 2% |
| Sunday Night | 33°F | Clear | 3 mph W | 0% |
| Monday | 63°F | Sunny | 1 to 6 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 3 mph WSW | 1% |
| Tuesday | 66°F | Sunny | 5 mph WNW | 1% |
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 Nov 4, 2026.