Dewey, IL Weather & Growing Conditions
Today
65°F
Slight Chance Light Rain then Slight Chance Drizzle
A slight chance of rain before 8am, then a slight chance of drizzle. Mostly cloudy. High near 65, with temperatures falling to around 58 in the afternoon. Southwest wind 13 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 65°F | Slight Chance Light Rain then Slight Chance Drizzle | 13 to 16 mph SW | 20% |
| Tonight | 45°F | Slight Chance Drizzle then Mostly Cloudy | 13 mph SW | 10% |
| Thursday | 60°F | Mostly Cloudy then Slight Chance Light Rain | 12 to 16 mph WSW | 17% |
| Thursday Night | 42°F | Chance Light Rain | 6 to 9 mph NW | 28% |
| Friday | 53°F | Partly Sunny | 13 mph NNW | 12% |
| Friday Night | 33°F | Partly Cloudy | 5 to 10 mph NNW | 0% |
| Saturday | 53°F | Sunny | 7 mph NW | 0% |
| Saturday Night | 31°F | Mostly Clear | 3 mph WNW | 1% |
| Sunday | 59°F | Sunny | 3 to 9 mph WNW | 2% |
| Sunday Night | 33°F | Clear | 5 mph W | 0% |
| Monday | 64°F | Sunny | 3 to 8 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 6 mph WSW | 1% |
| Tuesday | 66°F | Sunny | 6 mph WNW | 0% |
| Tuesday Night | 38°F | Mostly Clear | 3 mph NNW | 1% |
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 Nov 4, 2026.