Delavan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Delavan, a city in Tazewell County, Illinois.
Today
87°F
Mostly Cloudy
Mostly cloudy, with a high near 87. East southeast wind around 7 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Delavan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Cloudy | 7 mph ESE | 14% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 2 to 6 mph SSW | 47% |
| Sunday | 78°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 12 mph N | 70% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 12 to 15 mph NE | 65% |
| Monday | 67°F | Showers And Thunderstorms Likely | 14 mph NE | 64% |
| Monday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 46% |
| Tuesday | 65°F | Slight Chance Rain Showers | 13 mph NE | 23% |
| Tuesday Night | 51°F | Partly Cloudy | 6 to 13 mph NNE | 12% |
| Wednesday | 68°F | Mostly Sunny | 9 mph NNE | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 3 to 8 mph NNE | 1% |
| Thursday | 70°F | Mostly Sunny | 7 mph NNE | 2% |
| Thursday Night | 55°F | Partly Cloudy | 6 mph NE | 2% |
| Friday | 73°F | Mostly Sunny | 7 mph NE | 3% |
| Friday Night | 54°F | Partly Cloudy | 6 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Delavan (40.371, -89.546). Updated through the day.
Growing snapshot for Delavan
Last spring frost
Apr 17
First fall frost
Oct 18
Growing season
182 days
Hardiness zone
6a
More local growing data for Delavan: nearby ZIP 61734 weather · frost dates · planting calendar · Illinois frost dates
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North Pekin
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Washington
Climate data from the nearest NOAA station, Mason City 4Se, Il (16.1 mi from Delavan). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.