St. John, IN Weather & Growing Conditions
Tonight
65°F
Showers And Thunderstorms
Rain showers before 10pm, then showers and thunderstorms between 10pm and 1am, then patchy fog and showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy. Low around 65, with temperatures rising to around 68 overnight. East southeast wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 100%. New rainfall amounts between 2 and 3 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Showers And Thunderstorms | 5 mph ESE | 100% |
| Sunday | 70°F | Patchy Fog | 5 to 15 mph NNE | 83% |
| 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% |
| Saturday | 73°F | Mostly Sunny | 0 to 5 mph NE | 3% |
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.