Harman US

Royalton, IL Weather & Growing Conditions

Today
98°F
Sunny
Sunny. High near 98, with temperatures falling to around 96 in the afternoon. West southwest wind 3 to 8 mph.

7-day forecast

WhenTempForecastWindPrecip
Today 98°F Sunny 3 to 8 mph WSW 2%
Tonight 72°F Mostly Clear 5 mph SSW 2%
Sunday 96°F Mostly Sunny 3 to 7 mph WSW 1%
Sunday Night 68°F Mostly Cloudy then Chance Showers And Thunderstorms 6 mph NNW 33%
Monday 84°F Showers And Thunderstorms Likely 6 to 12 mph NNE 61%
Monday Night 60°F Showers And Thunderstorms Likely then Chance Showers And Thunderstorms 6 to 12 mph NNE 61%
Tuesday 75°F Chance Showers And Thunderstorms 8 to 13 mph N 25%
Tuesday Night 56°F Mostly Cloudy 5 to 14 mph N 13%
Wednesday 75°F Mostly Sunny 7 to 12 mph N 2%
Wednesday Night 55°F Partly Cloudy 2 to 10 mph N 0%
Thursday 76°F Mostly Sunny 3 to 9 mph N 3%
Thursday Night 57°F Partly Cloudy 2 to 8 mph NNE 4%
Friday 78°F Mostly Sunny 2 to 10 mph NNE 4%
Friday Night 58°F Partly Cloudy 3 to 8 mph NNE 2%

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

Growing snapshot for Royalton, IL

Last spring frost
Apr 6
First fall frost
Oct 22
Growing season
199 days
Hardiness zone
7a

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

Climate data from the nearest NOAA station, Du Quoin 4 Se, Il (7.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.