Keithsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keithsburg, a city in Mercer County, Illinois.
Today
54°F
Slight Chance Rain Showers then Cloudy
A slight chance of rain showers between 8am and 10am. Cloudy. High near 54, with temperatures falling to around 52 in the afternoon. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast for Keithsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 54°F | Slight Chance Rain Showers then Cloudy | 10 to 15 mph SW | 16% |
| Tonight | 45°F | Mostly Cloudy | 10 mph SW | 8% |
| Thursday | 56°F | Chance Rain Showers | 5 to 10 mph W | 48% |
| Thursday Night | 41°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph NW | 18% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 7% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 0 mph | 1% |
| Sunday | 58°F | Sunny | 0 to 5 mph W | 1% |
| Sunday Night | 35°F | Clear | 0 mph | 1% |
| Monday | 64°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 40°F | Clear | 0 to 5 mph W | 0% |
| Tuesday | 63°F | Sunny | 0 to 5 mph NW | 0% |
| Tuesday Night | 41°F | Partly Cloudy | 0 mph | 0% |
Forecast source: National Weather Service (api.weather.gov) for Keithsburg (41.100, -90.936). Updated through the day.
Growing snapshot for Keithsburg
Last spring frost
Apr 14
First fall frost
Oct 24
Growing season
190 days
Hardiness zone
5b
More local growing data for Keithsburg: nearby ZIP 61442 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, New Boston Dam 17, Il (9.3 mi from Keithsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.