Grantsburg, IN Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grantsburg, IN in one place.
Sunny, with a high near 92. Heat index values as high as 101. Southwest wind around 3 mph.
Local Weather Overview
This forecast page for Grantsburg, IN is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 15, 2026 6:41 PM EDT.
The active forecast window currently covers Sep 16 to Sep 21, 2026 for Grantsburg, IN.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 6:41 PM EDT
- Forecast office
- LMK
- Source
- NOAA / NWS
Daily Outlook
This Week in Grantsburg
Thursday looks like the warmest upcoming period in Grantsburg at 93 degrees F.
Monday Night is the coolest period ahead with temperatures near 63 degrees F.
The strongest winds are forecast for Sunday at about 5 mph SW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 6:41 PM EDT
- Coverage
- 6 days
- Time zone
- America/Indiana/Marengo
- Forecast office
- LMK
- Radar station
- KLVX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 71. South wind around 1 mph.
Sunny, with a high near 93. West wind around 3 mph.
Partly cloudy, with a low around 71.
Mostly sunny, with a high near 90.
Mostly clear, with a low around 67.
Sunny, with a high near 91.
Partly cloudy, with a low around 70.
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. Chance of precipitation is 20%.
A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Sunny
|
92°F |
3 mph
SW
|
|
Wednesday Night
Sep 16
|
Partly Cloudy
|
71°F |
1 mph
S
|
|
Thursday
Sep 17
|
Sunny
|
93°F |
3 mph
W
|
|
Thursday Night
Sep 17
|
Partly Cloudy
|
71°F |
1 mph
NW
|
|
Friday
Sep 18
|
Mostly Sunny
|
90°F |
2 mph
N
|
|
Friday Night
Sep 18
|
Mostly Clear
|
67°F |
2 mph
E
|
|
Saturday
Sep 19
|
Sunny
|
91°F |
3 mph
S
|
|
Saturday Night
Sep 19
|
Partly Cloudy
|
70°F |
2 mph
S
|
|
Sunday
Sep 20
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
90°F |
5 mph
SW
|
|
Sunday Night
Sep 20
|
Slight Chance Showers And Thunderstorms
|
67°F |
3 mph
SE
|
|
Monday
Sep 21
|
Chance Showers And Thunderstorms
|
84°F |
5 mph
SW
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms
|
63°F |
5 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grantsburg.