Potomac, IL Weather & Growing Conditions
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. South wind around 5 mph.
7-day forecast
| 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 | 3% |
| Wednesday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 60% |
| Thursday | 82°F | Showers And Thunderstorms | 5 mph SSW | 78% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms | 3 mph S | 51% |
| Friday | 83°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 2 mph S | 24% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 1 mph SW | 25% |
| Saturday | 84°F | Slight Chance Rain Showers then Mostly Sunny | 5 mph SSW | 15% |
| Saturday Night | 69°F | Mostly Clear | 2 to 6 mph SSW | 12% |
| Sunday | 86°F | Sunny | 7 to 10 mph SSW | 9% |
| Sunday Night | 70°F | Partly Cloudy | 9 mph SSW | 13% |
| Monday | 87°F | Slight Chance Showers And Thunderstorms | 9 mph SW | 20% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 9 mph SW | 31% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Potomac, IL
Last spring frost
Apr 21
First fall frost
Oct 20
Growing season
181 days
Hardiness zone
6a
Explore more for Potomac, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Danville, Il (9.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.