Galesburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Galesburg, a city in Knox County, Illinois.
Today
88°F
Mostly Sunny
Mostly sunny, with a high near 88. South southwest wind 5 to 8 mph.
7-day forecast for Galesburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Mostly Sunny | 5 to 8 mph SSW | 0% |
| Tonight | 67°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSE | 51% |
| Wednesday | 80°F | Chance Showers And Thunderstorms | 5 mph SSW | 69% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 5 mph N | 83% |
| Thursday | 80°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 3 mph NE | 64% |
| Thursday Night | 63°F | Mostly Clear | 2 mph NE | 8% |
| Friday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 mph S | 15% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 mph SSE | 15% |
| Saturday | 86°F | Sunny | 2 to 6 mph SSW | 10% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 3 to 8 mph S | 15% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Sunny | 7 to 12 mph SSW | 15% |
| Sunday Night | 70°F | Partly Cloudy then Chance Showers And Thunderstorms | 7 to 10 mph S | 28% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 7 to 10 mph SSW | 28% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 29% |
Forecast source: National Weather Service (api.weather.gov) for Galesburg (40.950, -90.377). Updated through the day.
Growing snapshot for Galesburg
Last spring frost
Apr 20
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
More local growing data for Galesburg: nearby ZIP 61401 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Abingdon
Altona
East Galesburg
Gilson
Henderson
Knoxville
Maquon
Nekoma
Oak Run
Oneida
Rio
St. Augustine
Victoria
Wataga
Williamsfield
Yates City
Climate data from the nearest NOAA station, Galesburg, Il (0.1 mi from Galesburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.