Mount Olive, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Olive, a city in Macoupin County, Illinois.
This Afternoon
93°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 93. Heat index values as high as 101. East wind around 3 mph. Chance of precipitation is 30%.
7-day forecast for Mount Olive
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 93°F | Chance Showers And Thunderstorms | 3 mph E | 25% |
| Tonight | 69°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 mph SE | 23% |
| Saturday | 95°F | Mostly Sunny | 3 to 7 mph SW | 6% |
| Saturday Night | 70°F | Mostly Cloudy | 3 mph S | 5% |
| Sunday | 91°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 7 mph NW | 27% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 mph N | 59% |
| Monday | 77°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 64% |
| Monday Night | 57°F | Showers And Thunderstorms Likely | 7 to 12 mph NE | 64% |
| Tuesday | 70°F | Slight Chance Rain Showers then Mostly Cloudy | 12 mph NE | 24% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 12 mph N | 4% |
| Wednesday | 73°F | Mostly Sunny | 6 to 9 mph N | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 8 mph N | 2% |
| Thursday | 74°F | Mostly Sunny | 3 to 7 mph N | 3% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 6 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Mount Olive (39.073, -89.728). Updated through the day.
Growing snapshot for Mount Olive
Last spring frost
Apr 13
First fall frost
Oct 24
Growing season
192 days
Hardiness zone
6b
More local growing data for Mount Olive: nearby ZIP 62069 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Hillsboro, Il (14.2 mi from Mount Olive). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.