Millersburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Millersburg, a community in Mercer County, Illinois.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. Southwest wind 5 to 10 mph.
7-day forecast for Millersburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 5 to 10 mph SW | 5% |
| Tonight | 68°F | Showers And Thunderstorms Likely | 5 mph NE | 59% |
| Wednesday | 80°F | Showers And Thunderstorms Likely | 5 mph NE | 79% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 0 to 5 mph N | 80% |
| Thursday | 81°F | Showers And Thunderstorms Likely then Mostly Sunny | 5 mph NE | 58% |
| Thursday Night | 63°F | Mostly Clear | 0 to 5 mph NE | 8% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph SE | 6% |
| Friday Night | 66°F | Mostly Clear | 0 to 5 mph S | 12% |
| Saturday | 86°F | Sunny | 5 mph S | 9% |
| Saturday Night | 71°F | Mostly Clear | 5 to 10 mph S | 13% |
| Sunday | 87°F | Sunny | 10 to 15 mph S | 13% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 29% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 29% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph S | 31% |
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
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Aledo
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New Boston
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Reynolds
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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 Aug 4, 2026.