Dewey, IL Weather & Growing Conditions
This Afternoon
80°F
Partly Sunny
Partly sunny. High near 80, with temperatures falling to around 71 in the afternoon. East wind around 9 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Partly Sunny | 9 mph E | 13% |
| Tonight | 67°F | Partly Cloudy | 9 mph ESE | 8% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 9 mph S | 32% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 8 mph SSE | 39% |
| Sunday | 81°F | Showers And Thunderstorms Likely | 5 to 13 mph NNE | 62% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 12 to 15 mph NE | 62% |
| Monday | 68°F | Showers And Thunderstorms Likely | 15 mph ENE | 71% |
| Monday Night | 52°F | Chance Showers And Thunderstorms | 12 to 16 mph NE | 51% |
| Tuesday | 66°F | Chance Rain Showers | 14 mph NE | 30% |
| Tuesday Night | 51°F | Mostly Cloudy | 7 to 14 mph NNE | 10% |
| Wednesday | 69°F | Partly Sunny | 8 to 12 mph NNE | 5% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NNE | 5% |
| Thursday | 71°F | Mostly Sunny | 6 to 9 mph N | 5% |
| Thursday Night | 53°F | Partly Cloudy | 5 to 8 mph NNE | 4% |
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 Sep 19, 2026.