St. John, IN Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind around 5 mph, with gusts as high as 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 mph SSW | 0% |
| Tonight | 64°F | Partly Cloudy | 5 mph SSW | 1% |
| Wednesday | 82°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph SW | 37% |
| Wednesday Night | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph SW | 87% |
| Thursday | 78°F | Showers And Thunderstorms Likely | 0 to 5 mph WSW | 87% |
| Thursday Night | 62°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 52% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph SW | 7% |
| Friday Night | 63°F | Partly Cloudy | 0 mph | 8% |
| Saturday | 83°F | Mostly Sunny | 0 to 5 mph SSW | 8% |
| Saturday Night | 67°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 15% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 10 mph SW | 15% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 39% |
| Monday | 85°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 39% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph WSW | 45% |
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 Aug 4, 2026.