Harman US

Topeka, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Topeka, a village in Mason County, Illinois.

Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. East southeast wind around 8 mph, with gusts as high as 16 mph. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Topeka

WhenTempForecastWindPrecip
Tonight 70°F Partly Cloudy 8 mph ESE 8%
Saturday 89°F Slight Chance Rain Showers then Mostly Cloudy 7 mph S 16%
Saturday Night 68°F Chance Showers And Thunderstorms 3 to 7 mph ESE 48%
Sunday 79°F Rain Showers Likely 2 to 8 mph N 66%
Sunday Night 59°F Showers And Thunderstorms Likely 7 to 10 mph NE 66%
Monday 68°F Showers And Thunderstorms Likely 10 mph NE 66%
Monday Night 55°F Chance Showers And Thunderstorms 9 mph NE 45%
Tuesday 65°F Chance Rain Showers 9 mph NE 27%
Tuesday Night 51°F Mostly Cloudy 3 to 7 mph NNE 5%
Wednesday 69°F Mostly Sunny 6 mph NNE 3%
Wednesday Night 53°F Partly Cloudy 1 to 5 mph NNE 1%
Thursday 70°F Mostly Sunny 5 mph NNE 4%
Thursday Night 55°F Partly Cloudy 3 mph NNE 3%
Friday 72°F Mostly Sunny 5 mph NE 4%

Forecast source: National Weather Service (api.weather.gov) for Topeka (40.330, -89.931). Updated through the day.

Growing snapshot for Topeka

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

More local growing data for Topeka: nearby ZIP 61567 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

All Illinois locations ›

Climate data from the nearest NOAA station, Havana, Il (9.9 mi from Topeka). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.