Millersburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Millersburg, a community in Mercer County, Illinois.
Overnight
51°F
Mostly Cloudy
Mostly cloudy. Low around 51, with temperatures rising to around 54 overnight. Southwest wind around 15 mph, with gusts as high as 25 mph.
7-day forecast for Millersburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Mostly Cloudy | 15 mph SW | 5% |
| Wednesday | 54°F | Slight Chance Rain Showers | 15 mph SW | 18% |
| Wednesday Night | 45°F | Mostly Cloudy | 10 to 15 mph SW | 10% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 49% |
| Thursday Night | 41°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 16% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 6% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph W | 1% |
| Sunday | 58°F | Sunny | 5 to 10 mph W | 1% |
| Sunday Night | 35°F | Clear | 0 to 5 mph W | 1% |
| Monday | 63°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 40°F | Clear | 0 to 5 mph W | 0% |
| Tuesday | 64°F | Sunny | 0 to 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Millersburg (41.240, -90.819). Updated through the day.
Growing snapshot for Millersburg
Last spring frost
Apr 22
First fall frost
Oct 19
Growing season
181 days
Hardiness zone
5b
More local growing data for Millersburg: nearby ZIP 61260 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Aledo
Alexis
Cable
Eliza
Hamlet
Joy
Keithsburg
Matherville
New Boston
North Henderson
Preemption
Reynolds
Seaton
Sherrard
Viola
Windsor
Climate data from the nearest NOAA station, Aledo, Il (7.9 mi from Millersburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.