Delavan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Delavan, a city in Tazewell County, Illinois.
Overnight
56°F
Slight Chance Light Rain
A slight chance of rain before 5am. Mostly cloudy, with a low around 56. South southwest wind around 13 mph, with gusts as high as 23 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Delavan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Slight Chance Light Rain | 13 mph SSW | 18% |
| Wednesday | 59°F | Slight Chance Drizzle | 15 mph SW | 10% |
| Wednesday Night | 45°F | Slight Chance Drizzle then Mostly Cloudy | 12 mph SW | 10% |
| Thursday | 59°F | Mostly Cloudy then Slight Chance Light Rain | 10 to 14 mph WSW | 17% |
| Thursday Night | 43°F | Slight Chance Light Rain then Mostly Cloudy | 6 to 9 mph NW | 24% |
| Friday | 53°F | Partly Sunny | 12 mph N | 6% |
| Friday Night | 33°F | Partly Cloudy | 1 to 8 mph NNW | 0% |
| Saturday | 53°F | Sunny | 1 to 6 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 3 mph WNW | 1% |
| Sunday | 59°F | Sunny | 2 to 8 mph W | 1% |
| Sunday Night | 34°F | Clear | 1 to 5 mph WSW | 1% |
| Monday | 64°F | Sunny | 2 to 8 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 67°F | Sunny | 5 mph WNW | 1% |
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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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 Nov 4, 2026.