St. John, IN Weather & Growing Conditions
This Afternoon
65°F
Slight Chance Rain Showers
A slight chance of rain showers and a slight chance of drizzle. Cloudy. High near 65, with temperatures falling to around 57 in the afternoon. West southwest wind around 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Slight Chance Rain Showers | 15 mph WSW | 2% |
| Tonight | 46°F | Slight Chance Rain Showers then Slight Chance Rain | 15 mph SW | 16% |
| Thursday | 54°F | Mostly Cloudy then Chance Rain | 10 to 15 mph WSW | 43% |
| Thursday Night | 39°F | Rain | 10 mph NW | 76% |
| Friday | 49°F | Partly Sunny then Slight Chance Rain | 10 to 15 mph NNW | 16% |
| Friday Night | 34°F | Partly Cloudy | 5 to 10 mph NNW | 5% |
| Saturday | 50°F | Mostly Sunny | 5 mph NW | 2% |
| Saturday Night | 32°F | Mostly Clear | 0 to 5 mph W | 0% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 1% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 0% |
| Monday | 60°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph WSW | 0% |
| Tuesday | 61°F | Sunny | 5 mph WNW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 0 mph | 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 Nov 5, 2026.