Grantsburg, IN Weather & Growing Conditions
Tonight
68°F
Slight Chance Showers And Thunderstorms then Partly Cloudy
A slight chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 68. Heat index values as high as 100. East wind around 2 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 68°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph E | 20% |
| Saturday | 93°F | Sunny then Slight Chance Showers And Thunderstorms | 3 mph S | 18% |
| Saturday Night | 70°F | Partly Cloudy | 2 mph S | 10% |
| Sunday | 93°F | Mostly Sunny | 5 mph SW | 8% |
| Sunday Night | 66°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph N | 17% |
| Monday | 85°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph NE | 46% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 7 mph NE | 46% |
| Tuesday | 76°F | Chance Showers And Thunderstorms | 6 mph NE | 37% |
| Tuesday Night | 57°F | Chance Showers And Thunderstorms then Mostly Cloudy | 2 to 6 mph N | 37% |
| Wednesday | 73°F | Partly Sunny | 3 mph N | 10% |
| Wednesday Night | 55°F | Partly Cloudy | 1 to 5 mph N | 9% |
| Thursday | 73°F | Mostly Sunny | 3 mph N | 6% |
| Thursday Night | 56°F | Partly Cloudy | 3 mph N | 6% |
| Friday | 74°F | Mostly Sunny | 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grantsburg, IN
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
184 days
Hardiness zone
6b
Explore more for Grantsburg, IN: full frost dates · planting calendar · Indiana frost dates
Climate data from the nearest NOAA station, English, In (0.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.