Keithsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keithsburg, a city in Mercer County, Illinois.
Tonight
51°F
Mostly Cloudy
Mostly cloudy. Low around 51, with temperatures rising to around 53 overnight. Southwest wind around 10 mph, with gusts as high as 25 mph. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Keithsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Cloudy | 10 mph SW | 6% |
| Wednesday | 57°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph SW | 16% |
| Wednesday Night | 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 | 57°F | Sunny | 0 to 5 mph W | 1% |
| Sunday Night | 35°F | Clear | 0 mph | 1% |
| Monday | 63°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 0 to 5 mph W | 0% |
| Tuesday | 64°F | Sunny | 0 to 5 mph NW | 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.