Kewanee, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kewanee, a city in Henry County, Illinois.
Overnight
54°F
Slight Chance Rain Showers
A slight chance of rain showers after 5am. Mostly cloudy. Low around 54, with temperatures rising to around 56 overnight. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast for Kewanee
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Rain Showers | 15 mph SW | 19% |
| Wednesday | 57°F | Chance Rain Showers then Mostly Cloudy | 15 mph SW | 27% |
| Wednesday Night | 47°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 15% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph W | 38% |
| Thursday Night | 43°F | Chance Rain Showers | 10 mph NW | 30% |
| Friday | 50°F | Partly Sunny | 5 to 15 mph N | 8% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 57°F | Sunny | 5 to 10 mph W | 1% |
| Sunday Night | 36°F | Clear | 5 mph W | 1% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 to 10 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Kewanee (41.239, -89.926). Updated through the day.
Growing snapshot for Kewanee
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
175 days
Hardiness zone
5b
More local growing data for Kewanee: nearby ZIP 61443 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Kewanee 1 E, Il (2.8 mi from Kewanee). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.