Dewey, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dewey, a community in Champaign County, Illinois.
This Afternoon
80°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 5pm. Mostly cloudy, with a high near 80. East northeast wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Dewey
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Showers And Thunderstorms Likely | 9 mph ENE | 61% |
| Tonight | 67°F | Partly Cloudy | 9 mph ESE | 6% |
| Saturday | 85°F | Chance Showers And Thunderstorms | 9 mph S | 34% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 7 mph SSE | 40% |
| Sunday | 80°F | Showers And Thunderstorms Likely | 3 to 12 mph NNE | 63% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 14 mph NE | 63% |
| Monday | 68°F | Showers And Thunderstorms Likely | 15 mph ENE | 70% |
| Monday Night | 52°F | Chance Showers And Thunderstorms | 12 to 16 mph NE | 51% |
| Tuesday | 66°F | Chance Rain Showers | 14 mph NE | 29% |
| Tuesday Night | 51°F | Mostly Cloudy | 7 to 14 mph NNE | 10% |
| Wednesday | 68°F | Partly Sunny | 10 mph NNE | 5% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NNE | 5% |
| Thursday | 71°F | Mostly Sunny | 5 to 8 mph N | 5% |
| Thursday Night | 53°F | Partly Cloudy | 7 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Dewey (40.319, -88.283). Updated through the day.
Growing snapshot for Dewey
Last spring frost
Apr 21
First fall frost
Oct 18
Growing season
179 days
Hardiness zone
6a
More local growing data for Dewey: nearby ZIP 61840 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Bondville
Broadlands
Champaign
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Foosland
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Homer
Ivesdale
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Ludlow
Mahomet
Ogden
Penfield
Pesotum
Philo
Rantoul
Royal
Sadorus
Savoy
Seymour
Sidney
St. Joseph
Thomasboro
Tolono
Urbana
Climate data from the nearest NOAA station, Rantoul, Il (7.5 mi from Dewey). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.