St. John, IN Weather & Growing Conditions
This Afternoon
72°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy. High near 72, with temperatures falling to around 70 in the afternoon. Southeast wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Chance Showers And Thunderstorms | 5 mph SE | 26% |
| Tonight | 65°F | Showers And Thunderstorms | 0 to 5 mph SSE | 85% |
| Sunday | 70°F | Showers And Thunderstorms | 5 to 15 mph NNE | 82% |
| Sunday Night | 54°F | Rain Showers Likely | 10 to 15 mph NE | 56% |
| Monday | 65°F | Chance Rain Showers | 10 to 15 mph ENE | 41% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph ENE | 35% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Tuesday Night | 51°F | Chance Rain Showers | 5 to 10 mph NE | 31% |
| Wednesday | 64°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 15% |
| Wednesday Night | 52°F | Mostly Cloudy | 5 to 10 mph NNE | 8% |
| Thursday | 68°F | Partly Sunny | 5 to 10 mph NNE | 1% |
| Thursday Night | 53°F | Mostly Cloudy | 0 to 5 mph NNE | 7% |
| Friday | 71°F | Partly Sunny | 0 to 10 mph NE | 6% |
| Friday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 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 20, 2026.