Keithsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keithsburg, a city in Mercer County, Illinois.
Overnight
61°F
Mostly Clear
Mostly clear. Low around 61, with temperatures rising to around 63 overnight. South wind around 5 mph.
7-day forecast for Keithsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 87°F | Mostly Sunny | 5 to 10 mph S | 6% |
| Tuesday Night | 68°F | Showers And Thunderstorms Likely | 5 mph NE | 57% |
| Wednesday | 80°F | Showers And Thunderstorms Likely | 5 mph NE | 77% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 0 to 5 mph N | 81% |
| Thursday | 80°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 64% |
| Thursday Night | 62°F | Partly Cloudy | 0 mph | 8% |
| Friday | 83°F | Mostly Sunny | 0 mph | 6% |
| Friday Night | 65°F | Mostly Clear | 0 mph | 13% |
| Saturday | 86°F | Sunny | 0 to 5 mph S | 10% |
| Saturday Night | 71°F | Mostly Clear | 5 mph S | 11% |
| Sunday | 87°F | Sunny | 5 to 10 mph SW | 11% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 26% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 26% |
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 Aug 4, 2026.