Harman US

St. John, IN Weather & Growing Conditions

Today
78°F
Showers And Thunderstorms then Showers And Thunderstorms Likely
Showers and thunderstorms before noon, then showers and thunderstorms likely. Cloudy. High near 78, with temperatures falling to around 76 in the afternoon. Southeast wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Today 78°F Showers And Thunderstorms then Showers And Thunderstorms Likely 5 to 10 mph SE 96%
Tonight 64°F Showers And Thunderstorms Likely then Showers And Thunderstorms 5 mph S 89%
Sunday 70°F Showers And Thunderstorms Likely 5 to 15 mph NNE 62%
Sunday Night 54°F Chance Showers And Thunderstorms 10 to 15 mph NE 41%
Monday 65°F Chance Rain Showers 10 to 15 mph NE 43%
Monday Night 50°F Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 28%
Tuesday 64°F Slight Chance Rain Showers 10 to 15 mph NE 16%
Tuesday Night 51°F Mostly Cloudy 5 to 10 mph NE 14%
Wednesday 65°F Partly Sunny 5 to 10 mph NNE 10%
Wednesday Night 52°F Mostly Cloudy 5 to 10 mph NNE 6%
Thursday 67°F Partly Sunny 5 to 10 mph NNE 3%
Thursday Night 52°F Mostly Cloudy 5 to 10 mph NNE 3%
Friday 70°F Mostly Sunny 5 to 10 mph NE 3%
Friday Night 52°F Partly Cloudy 0 to 10 mph ENE 2%

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

Growing snapshot for St. John, IN

Last spring frost
Apr 23
First fall frost
Oct 20
Growing season
179 days
Hardiness zone
6a

Explore more for St. John, IN: full frost dates · planting calendar · Indiana frost dates

Climate data from the nearest NOAA station, Park Forest, Il (11.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.