Dewey, IL Weather & Growing Conditions
Today
83°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 83. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Patchy Fog then Sunny | 5 mph S | 0% |
| Tonight | 65°F | Mostly Clear | 5 mph SSE | 0% |
| Wednesday | 85°F | Mostly Sunny | 3 to 7 mph SSW | 14% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms | 6 mph S | 81% |
| Thursday | 81°F | Showers And Thunderstorms | 6 mph SSW | 81% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms | 5 mph S | 33% |
| Friday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 mph S | 15% |
| Friday Night | 65°F | Chance Showers And Thunderstorms | 3 mph S | 25% |
| Saturday | 84°F | Slight Chance Rain Showers then Mostly Sunny | 6 mph SSW | 18% |
| Saturday Night | 69°F | Mostly Clear | 5 to 9 mph SSW | 13% |
| Sunday | 86°F | Sunny | 9 to 13 mph SSW | 9% |
| Sunday Night | 70°F | Partly Cloudy | 12 mph SSW | 13% |
| Monday | 87°F | Slight Chance Showers And Thunderstorms | 12 mph SSW | 18% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph SW | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Dewey, IL
Last spring frost
Apr 21
First fall frost
Oct 18
Growing season
179 days
Hardiness zone
6a
Explore more for Dewey, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Rantoul, Il (7.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.