Big Sag, MT Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Big Sag, MT in one place.
Mostly sunny. High near 60, with temperatures falling to around 53 in the afternoon. Southwest wind 6 to 29 mph, with gusts as high as 40 mph.
Local Weather Overview
This forecast page for Big Sag, 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 6, 2026 9:32 AM MST.
The active forecast window currently covers Nov 7 to Nov 12, 2026 for Big Sag, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 7 to Nov 12, 2026
- Latest sync
- Nov 6, 2026 9:32 AM MST
- Forecast office
- TFX
- Source
- NOAA / NWS
Daily Outlook
This Week in Big Sag
Thursday looks like the warmest upcoming period in Big Sag at 63 degrees F.
Sunday Night is the coolest period ahead with temperatures near 38 degrees F.
The strongest winds are forecast for Sunday at about 22 to 32 mph WSW.
The forecast from Nov 7 through Nov 12 stays mostly dry.
Forecast Details
- Last updated
- Nov 6, 2026 9:32 AM MST
- Coverage
- 7 days
- Time zone
- America/Denver
- Forecast office
- TFX
- Radar station
- KTFX
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 48. South wind 6 to 22 mph, with gusts as high as 29 mph.
Mostly sunny, with a high near 59. West southwest wind 22 to 32 mph, with gusts as high as 41 mph.
Partly cloudy, with a low around 38. West southwest wind 14 to 23 mph, with gusts as high as 35 mph.
Mostly sunny, with a high near 51. Southwest wind 2 to 14 mph, with gusts as high as 18 mph.
Mostly cloudy, with a low around 41. South southwest wind 2 to 20 mph, with gusts as high as 28 mph.
Mostly sunny, with a high near 57.
Partly cloudy, with a low around 46.
Mostly sunny, with a high near 61.
Partly cloudy, with a low around 47.
Partly sunny, with a high near 63.
Mostly cloudy, with a low around 45.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Nov 7
|
Mostly Sunny
|
60°F |
6 to 29 mph
SW
|
|
Saturday Night
Nov 7
|
Partly Cloudy
|
48°F |
6 to 22 mph
S
|
|
Sunday
Nov 8
|
Mostly Sunny
|
59°F |
22 to 32 mph
WSW
|
|
Sunday Night
Nov 8
|
Partly Cloudy
|
38°F |
14 to 23 mph
WSW
|
|
Monday
Nov 9
|
Mostly Sunny
|
51°F |
2 to 14 mph
SW
|
|
Monday Night
Nov 9
|
Mostly Cloudy
|
41°F |
2 to 20 mph
SSW
|
|
Tuesday
Nov 10
|
Mostly Sunny
|
57°F |
20 to 31 mph
SW
|
|
Tuesday Night
Nov 10
|
Partly Cloudy
|
46°F |
23 to 29 mph
SW
|
|
Veterans Day
Nov 11
|
Mostly Sunny
|
61°F |
13 to 23 mph
SW
|
|
Wednesday Night
Nov 11
|
Partly Cloudy
|
47°F |
13 to 17 mph
SW
|
|
Thursday
Nov 12
|
Partly Sunny
|
63°F |
9 to 16 mph
SW
|
|
Thursday Night
Nov 12
|
Mostly Cloudy
|
45°F |
9 to 14 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Big Sag.