Keithsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keithsburg, a city in Mercer County, Illinois.
Overnight
69°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 2am and 4am, then patchy fog and a slight chance of showers and thunderstorms. Partly cloudy, with a low around 69. Southeast wind around 5 mph. Chance of precipitation is 20%.
7-day forecast for Keithsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 69°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 23% |
| Saturday | 85°F | Patchy Fog | 5 to 10 mph S | 46% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph W | 80% |
| Sunday | 73°F | Showers And Thunderstorms | 5 to 15 mph NE | 80% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 15 mph NE | 58% |
| Monday | 65°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 63% |
| Monday Night | 53°F | Chance Rain Showers | 10 mph NE | 52% |
| Tuesday | 64°F | Chance Rain Showers | 10 mph NE | 39% |
| Tuesday Night | 49°F | Mostly Clear | 5 to 10 mph NE | 5% |
| Wednesday | 68°F | Mostly Sunny | 5 mph NE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 70°F | Partly Sunny | 0 to 5 mph NE | 5% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 73°F | Mostly Sunny | 0 to 5 mph NE | 4% |
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
Nearby towns & communities
Aledo
Alexis
Cable
Eliza
Hamlet
Joy
Matherville
Millersburg
New Boston
North Henderson
Preemption
Reynolds
Seaton
Sherrard
Viola
Windsor
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 Sep 19, 2026.