Grannis, MT Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grannis, MT in one place.
Mostly sunny. High near 59, with temperatures falling to around 53 in the afternoon. West southwest wind 9 to 20 mph.
Local Weather Overview
This forecast page for Grannis, 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: Nov 5, 2026 4:47 PM MST.
The active forecast window currently covers Nov 7 to Nov 11, 2026 for Grannis, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 7 to Nov 11, 2026
- Latest sync
- Nov 5, 2026 4:47 PM MST
- Forecast office
- BYZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Grannis
Sunday looks like the warmest upcoming period in Grannis at 64 degrees F.
Sunday Night is the coolest period ahead with temperatures near 32 degrees F.
The strongest winds are forecast for Sunday at about 12 to 28 mph SW.
The forecast from Nov 7 through Nov 11 stays mostly dry.
Forecast Details
- Last updated
- Nov 5, 2026 4:47 PM MST
- Coverage
- 6 days
- Time zone
- America/Denver
- Forecast office
- BYZ
- Radar station
- KBLX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear. Low around 34, with temperatures rising to around 37 overnight. West southwest wind 10 to 25 mph.
Mostly sunny. High near 64, with temperatures falling to around 52 in the afternoon. Southwest wind 12 to 28 mph, with gusts as high as 39 mph.
Mostly cloudy. Low around 32, with temperatures rising to around 34 overnight. West southwest wind 5 to 14 mph.
Mostly sunny. High near 57, with temperatures falling to around 50 in the afternoon. Southwest wind around 5 mph.
Mostly cloudy. Low around 34, with temperatures rising to around 36 overnight. Southwest wind 3 to 9 mph.
Mostly sunny. High near 59, with temperatures falling to around 52 in the afternoon. West southwest wind 8 to 14 mph.
Mostly clear. Low around 34, with temperatures rising to around 36 overnight. West southwest wind 8 to 13 mph.
Sunny. High near 60, with temperatures falling to around 52 in the afternoon. Southwest wind around 10 mph.
Partly cloudy, with a low around 35. Southwest wind around 10 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Nov 7
|
Mostly Sunny
|
59°F |
9 to 20 mph
WSW
|
|
Saturday Night
Nov 7
|
Mostly Clear
|
34°F |
10 to 25 mph
WSW
|
|
Sunday
Nov 8
|
Mostly Sunny
|
64°F |
12 to 28 mph
SW
|
|
Sunday Night
Nov 8
|
Mostly Cloudy
|
32°F |
5 to 14 mph
WSW
|
|
Monday
Nov 9
|
Mostly Sunny
|
57°F |
5 mph
SW
|
|
Monday Night
Nov 9
|
Mostly Cloudy
|
34°F |
3 to 9 mph
SW
|
|
Tuesday
Nov 10
|
Mostly Sunny
|
59°F |
8 to 14 mph
WSW
|
|
Tuesday Night
Nov 10
|
Mostly Clear
|
34°F |
8 to 13 mph
WSW
|
|
Veterans Day
Nov 11
|
Sunny
|
60°F |
10 mph
SW
|
|
Wednesday Night
Nov 11
|
Partly Cloudy
|
35°F |
10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grannis.