Harman US

Jerseyville, IL Weather & Growing Conditions

This Afternoon
95°F
Mostly Cloudy
Mostly cloudy, with a high near 95. Southwest wind 5 to 8 mph.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 95°F Mostly Cloudy 5 to 8 mph SW 6%
Tonight 70°F Partly Cloudy 6 mph S 2%
Sunday 89°F Partly Sunny then Chance Showers And Thunderstorms 3 to 8 mph W 30%
Sunday Night 63°F Chance Showers And Thunderstorms 7 to 12 mph NE 70%
Monday 76°F Showers And Thunderstorms Likely 9 mph NE 70%
Monday Night 57°F Chance Showers And Thunderstorms 7 to 10 mph NE 43%
Tuesday 69°F Chance Rain Showers then Partly Sunny 9 to 14 mph NE 27%
Tuesday Night 51°F Mostly Cloudy 6 to 13 mph N 7%
Wednesday 72°F Mostly Sunny 10 mph N 0%
Wednesday Night 53°F Partly Cloudy 3 to 9 mph N 0%
Thursday 74°F Mostly Sunny 5 to 8 mph N 2%
Thursday Night 55°F Partly Cloudy 3 to 7 mph NE 4%
Friday 76°F Mostly Sunny 5 to 8 mph NE 6%
Friday Night 55°F Partly Cloudy 3 to 7 mph NE 4%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Jerseyville, IL

Last spring frost
Apr 14
First fall frost
Oct 19
Growing season
187 days
Hardiness zone
6b

Explore more for Jerseyville, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Jerseyville 2 Sw, Il (1.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.