Sumner, MT Weather Forecast
Local 7-day forecast
Partly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Sumner, MT in one place.
Partly cloudy, with a low around 34. West wind 5 to 8 mph.
Local Weather Overview
This forecast page for Sumner, 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 11, 2026 1:37 AM MST.
The active forecast window currently covers Nov 11 to Nov 17, 2026 for Sumner, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 11 to Nov 17, 2026
- Latest sync
- Nov 11, 2026 1:37 AM MST
- Forecast office
- GGW
- Source
- NOAA / NWS
Daily Outlook
This Week in Sumner
Veterans Day looks like the warmest upcoming period in Sumner at 60 degrees F.
Saturday Night is the coolest period ahead with temperatures near 31 degrees F.
The strongest winds are forecast for Friday Night at about 8 to 13 mph ESE.
The forecast from Nov 11 through Nov 17 stays mostly dry.
Forecast Details
- Last updated
- Nov 11, 2026 1:37 AM MST
- Coverage
- 7 days
- Time zone
- America/Denver
- Forecast office
- GGW
- Radar station
- KGGW
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly sunny. High near 60, with temperatures falling to around 52 in the afternoon. West southwest wind 2 to 8 mph.
Mostly clear, with a low around 34. Southeast wind around 3 mph.
Mostly sunny, with a high near 55. Southeast wind 2 to 8 mph.
Mostly cloudy, with a low around 33. Southeast wind 2 to 7 mph.
Mostly sunny, with a high near 52. East southeast wind 3 to 12 mph, with gusts as high as 20 mph.
Mostly cloudy, with a low around 32. East southeast wind 8 to 13 mph, with gusts as high as 21 mph.
Partly sunny, with a high near 49. Southeast wind 8 to 13 mph, with gusts as high as 22 mph.
Partly cloudy, with a low around 31. Southeast wind 2 to 9 mph, with gusts as high as 18 mph.
Mostly sunny, with a high near 52. South southwest wind 2 to 8 mph.
Partly cloudy, with a low around 32. South southwest wind 1 to 6 mph.
Mostly sunny, with a high near 53.
Mostly cloudy, with a low around 33.
Mostly cloudy, with a high near 50.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Nov 11
|
Partly Cloudy
|
34°F |
5 to 8 mph
W
|
|
Veterans Day
Nov 11
|
Mostly Sunny
|
60°F |
2 to 8 mph
WSW
|
|
Wednesday Night
Nov 11
|
Mostly Clear
|
34°F |
3 mph
SE
|
|
Thursday
Nov 12
|
Mostly Sunny
|
55°F |
2 to 8 mph
SE
|
|
Thursday Night
Nov 12
|
Mostly Cloudy
|
33°F |
2 to 7 mph
SE
|
|
Friday
Nov 13
|
Mostly Sunny
|
52°F |
3 to 12 mph
ESE
|
|
Friday Night
Nov 13
|
Mostly Cloudy
|
32°F |
8 to 13 mph
ESE
|
|
Saturday
Nov 14
|
Partly Sunny
|
49°F |
8 to 13 mph
SE
|
|
Saturday Night
Nov 14
|
Partly Cloudy
|
31°F |
2 to 9 mph
SE
|
|
Sunday
Nov 15
|
Mostly Sunny
|
52°F |
2 to 8 mph
SSW
|
|
Sunday Night
Nov 15
|
Partly Cloudy
|
32°F |
1 to 6 mph
SSW
|
|
Monday
Nov 16
|
Mostly Sunny
|
53°F |
1 to 5 mph
SSW
|
|
Monday Night
Nov 16
|
Mostly Cloudy
|
33°F |
3 mph
SW
|
|
Tuesday
Nov 17
|
Mostly Cloudy
|
50°F |
1 to 8 mph
WNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Sumner.