Galesburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Galesburg, a city in Knox County, Illinois.
Today
84°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 2pm. Mostly cloudy, with a high near 84. Southeast wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Galesburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Slight Chance Showers And Thunderstorms | 8 mph SE | 23% |
| Tonight | 67°F | Showers And Thunderstorms Likely | 2 to 6 mph WSW | 89% |
| Sunday | 73°F | Showers And Thunderstorms Likely | 3 to 14 mph NNE | 72% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 13 to 16 mph NE | 58% |
| Monday | 64°F | Showers And Thunderstorms Likely | 16 mph ENE | 62% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 14 mph NE | 50% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 14 mph NE | 41% |
| Tuesday Night | 49°F | Partly Cloudy | 6 to 10 mph NNE | 8% |
| Wednesday | 67°F | Mostly Sunny | 9 mph NNE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph NE | 1% |
| Thursday | 69°F | Mostly Sunny | 6 mph NE | 6% |
| Thursday Night | 54°F | Partly Cloudy | 5 mph NE | 4% |
| Friday | 72°F | Mostly Sunny | 3 to 7 mph ENE | 4% |
| Friday Night | 54°F | Partly Cloudy | 5 mph ENE | 4% |
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 Sep 19, 2026.