Galesburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Galesburg, a city in Knox County, Illinois.
Overnight
68°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy, with a low around 68. East northeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Galesburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Showers And Thunderstorms Likely | 5 mph ENE | 66% |
| Sunday | 73°F | Patchy Fog then Showers And Thunderstorms Likely | 3 to 13 mph NNE | 72% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 14 mph NE | 55% |
| Monday | 64°F | Rain Showers Likely | 15 mph ENE | 73% |
| Monday Night | 54°F | Rain Showers Likely | 9 to 13 mph ENE | 69% |
| Tuesday | 63°F | Rain Showers Likely | 13 mph NE | 55% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NNE | 8% |
| Wednesday | 65°F | Partly Sunny | 8 mph NNE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph NNE | 1% |
| Thursday | 69°F | Partly Sunny | 5 mph NE | 2% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 3 mph NE | 15% |
| Friday | 72°F | Slight Chance Rain Showers then Partly Sunny | 5 mph NE | 15% |
| Friday Night | 55°F | Partly Cloudy | 3 mph ENE | 6% |
| Saturday | 73°F | Mostly Sunny | 5 mph E | 5% |
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 20, 2026.