Potomac, IL Weather & Growing Conditions
Today
67°F
Slight Chance Drizzle
A slight chance of drizzle. Mostly cloudy. High near 67, with temperatures falling to around 59 in the afternoon. Southwest wind 10 to 14 mph, with gusts as high as 22 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 67°F | Slight Chance Drizzle | 10 to 14 mph SW | 11% |
| Tonight | 45°F | Slight Chance 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% |
| Tuesday Night | 38°F | Mostly Clear | 1 mph NNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Potomac, IL
Last spring frost
Apr 22
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
6a
Explore more for Potomac, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Hoopeston, Il (12.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.