Harman US

Jacksonville, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Jacksonville, a city in Morgan County, Illinois.

Overnight
72°F
Mostly Clear
Mostly clear, with a low around 72. South wind around 6 mph.

7-day forecast for Jacksonville

WhenTempForecastWindPrecip
Overnight 72°F Mostly Clear 6 mph S 4%
Saturday 93°F Mostly Cloudy 5 to 8 mph SW 7%
Saturday Night 69°F Mostly Cloudy then Chance Showers And Thunderstorms 5 mph SSW 27%
Sunday 83°F Chance Showers And Thunderstorms 2 to 9 mph NNW 48%
Sunday Night 61°F Chance Showers And Thunderstorms 8 to 13 mph NE 71%
Monday 70°F Showers And Thunderstorms Likely 13 mph NE 71%
Monday Night 55°F Chance Rain Showers 9 to 13 mph NE 33%
Tuesday 66°F Slight Chance Rain Showers 13 mph NE 24%
Tuesday Night 50°F Mostly Cloudy 5 to 10 mph NNE 8%
Wednesday 70°F Mostly Sunny 9 mph NNE 1%
Wednesday Night 52°F Partly Cloudy 2 to 8 mph NNE 1%
Thursday 72°F Mostly Sunny 3 to 7 mph NNE 3%
Thursday Night 55°F Partly Cloudy 2 to 6 mph NNE 3%
Friday 75°F Mostly Sunny 3 to 7 mph NE 4%

Forecast source: National Weather Service (api.weather.gov) for Jacksonville (39.729, -90.232). Updated through the day.

Growing snapshot for Jacksonville

Last spring frost
Apr 19
First fall frost
Oct 17
Growing season
179 days
Hardiness zone
6a

More local growing data for Jacksonville: nearby ZIP 62650 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

All Illinois locations ›

Climate data from the nearest NOAA station, Jacksonville 2E, Il (1.2 mi from Jacksonville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.