Harman US

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

WhenTempForecastWindPrecip
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

Nearby towns & communities

All Illinois locations ›

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.