Delavan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Delavan, a city in Tazewell County, Illinois.
Tonight
45°F
Slight Chance Drizzle then Cloudy
A slight chance of drizzle before 10pm. Cloudy, with a low around 45. Southwest wind around 12 mph, with gusts as high as 20 mph.
7-day forecast for Delavan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 45°F | Slight Chance Drizzle then Cloudy | 12 mph SW | 10% |
| Thursday | 58°F | Mostly Cloudy then Slight Chance Light Rain | 9 to 15 mph WSW | 23% |
| Thursday Night | 41°F | Slight Chance Light Rain then Mostly Cloudy | 7 to 10 mph NW | 23% |
| Friday | 51°F | Mostly Sunny | 7 to 12 mph N | 1% |
| Friday Night | 30°F | Mostly Clear | 1 to 6 mph N | 0% |
| Saturday | 53°F | Sunny | 1 to 5 mph NW | 0% |
| Saturday Night | 31°F | Mostly Clear | 2 mph WNW | 0% |
| Sunday | 60°F | Sunny | 2 to 7 mph W | 0% |
| Sunday Night | 34°F | Mostly Clear | 3 mph WSW | 0% |
| Monday | 64°F | Sunny | 1 to 8 mph SW | 0% |
| Monday Night | 39°F | Clear | 2 to 7 mph WSW | 0% |
| Tuesday | 65°F | Sunny | 5 mph WNW | 1% |
| Tuesday Night | 39°F | Mostly Clear | 2 mph N | 2% |
| Veterans Day | 65°F | Mostly Sunny | 5 mph NNE | 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 5, 2026.