Grantsdale, MT Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grantsdale, MT in one place.
Mostly sunny, with a high near 69. Southeast wind 2 to 7 mph.
Local Weather Overview
This forecast page for Grantsdale, MT 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 14, 2026 9:18 PM MDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Grantsdale, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 14, 2026 9:18 PM MDT
- Forecast office
- MSO
- Source
- NOAA / NWS
Daily Outlook
This Week in Grantsdale
Thursday looks like the warmest upcoming period in Grantsdale at 76 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 43 degrees F.
The strongest winds are forecast for Wednesday at about 1 to 8 mph NNE.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 14, 2026 9:18 PM MDT
- Coverage
- 7 days
- Time zone
- America/Denver
- Forecast office
- MSO
- Radar station
- KMSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly cloudy, with a low around 43. Northwest wind 1 to 6 mph.
Sunny, with a high near 72. North northeast wind 1 to 8 mph.
Mostly clear, with a low around 45. East northeast wind 1 to 8 mph.
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76. Chance of precipitation is 20%.
Showers and thunderstorms likely before midnight, then a chance of rain. Mostly cloudy, with a low around 49. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of rain before noon, then showers and thunderstorms likely. Mostly cloudy, with a high near 70. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 46.
Mostly sunny, with a high near 72.
Mostly clear, with a low around 45.
Sunny, with a high near 74.
Mostly clear, with a low around 46.
Sunny, with a high near 76.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Sep 15
|
Mostly Sunny
|
69°F |
2 to 7 mph
SE
|
|
Tuesday Night
Sep 15
|
Mostly Cloudy
|
43°F |
1 to 6 mph
NW
|
|
Wednesday
Sep 16
|
Sunny
|
72°F |
1 to 8 mph
NNE
|
|
Wednesday Night
Sep 16
|
Mostly Clear
|
45°F |
1 to 8 mph
ENE
|
|
Thursday
Sep 17
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
76°F |
5 mph
ESE
|
|
Thursday Night
Sep 17
|
Showers And Thunderstorms Likely then Chance Light Rain
|
49°F |
6 mph
SW
|
|
Friday
Sep 18
|
Chance Light Rain then Showers And Thunderstorms Likely
|
70°F |
5 mph
W
|
|
Friday Night
Sep 18
|
Chance Showers And Thunderstorms then Partly Cloudy
|
46°F |
5 mph
SW
|
|
Saturday
Sep 19
|
Mostly Sunny
|
72°F |
3 to 7 mph
SSW
|
|
Saturday Night
Sep 19
|
Mostly Clear
|
45°F |
2 to 6 mph
WSW
|
|
Sunday
Sep 20
|
Sunny
|
74°F |
5 mph
SSW
|
|
Sunday Night
Sep 20
|
Mostly Clear
|
46°F |
5 mph
W
|
|
Monday
Sep 21
|
Sunny
|
76°F |
6 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grantsdale.