Macomb, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Macomb, a city in Mcdonough County, Illinois.
This Afternoon
68°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy, with a high near 68. South wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%.
7-day forecast for Macomb
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Showers And Thunderstorms | 15 to 20 mph S | 95% |
| Tonight | 51°F | Showers And Thunderstorms Likely | 10 to 15 mph S | 65% |
| Wednesday | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph SW | 16% |
| Wednesday Night | 43°F | Mostly Cloudy | 10 mph SW | 5% |
| Thursday | 56°F | Partly Sunny | 10 to 15 mph W | 13% |
| Thursday Night | 42°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph NW | 28% |
| Friday | 53°F | Mostly Cloudy | 5 to 10 mph N | 12% |
| Friday Night | 35°F | Mostly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph NW | 1% |
| Saturday Night | 35°F | Mostly Clear | 0 mph | 4% |
| Sunday | 58°F | Sunny | 0 to 10 mph W | 4% |
| Sunday Night | 36°F | Mostly Clear | 0 to 5 mph W | 2% |
| Monday | 63°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 0 to 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Macomb (40.470, -90.683). Updated through the day.
Growing snapshot for Macomb
Last spring frost
Apr 17
First fall frost
Oct 22
Growing season
185 days
Hardiness zone
6a
More local growing data for Macomb: nearby ZIP 61455 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Adair
Bardolph
Blandinsville
Bushnell
Colchester
Georgetown
Good Hope
Industry
Prairie City
Sciota
Tennessee
Climate data from the nearest NOAA station, Prairie City 2S, Il (13.9 mi from Macomb). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.