Keystone, MT Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Keystone, MT in one place.
Mostly sunny, with a high near 49. South southeast wind around 3 mph.
Local Weather Overview
This forecast page for Keystone, 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 4:49 PM MST.
The active forecast window currently covers Nov 6 to Nov 11, 2026 for Keystone, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 6 to Nov 11, 2026
- Latest sync
- Nov 5, 2026 4:49 PM MST
- Forecast office
- MSO
- Source
- NOAA / NWS
Daily Outlook
This Week in Keystone
Saturday looks like the warmest upcoming period in Keystone at 58 degrees F.
Sunday Night is the coolest period ahead with temperatures near 34 degrees F.
The strongest winds are forecast for Sunday at about 2 to 8 mph SW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Nov 5, 2026 4:49 PM MST
- 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 39. South wind around 5 mph.
Mostly sunny, with a high near 58. South southeast wind around 3 mph.
A chance of rain after 5am. Partly cloudy, with a low around 41. Chance of precipitation is 50%.
A chance of rain before 5pm. Mostly cloudy, with a high near 49.
Mostly cloudy, with a low around 34.
Partly sunny, with a high near 50.
A slight chance of rain after 11pm. Mostly cloudy, with a low around 38.
A chance of rain. Partly sunny, with a high near 54.
A slight chance of rain before 5am. Mostly cloudy, with a low around 40.
Partly sunny, with a high near 58.
A slight chance of rain after 11pm. Mostly cloudy, with a low around 40.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Nov 6
|
Mostly Sunny
|
49°F |
3 mph
SSE
|
|
Friday Night
Nov 6
|
Mostly Cloudy
|
39°F |
5 mph
S
|
|
Saturday
Nov 7
|
Mostly Sunny
|
58°F |
3 mph
SSE
|
|
Saturday Night
Nov 7
|
Partly Cloudy then Chance Light Rain
|
41°F |
2 to 6 mph
SSE
|
|
Sunday
Nov 8
|
Chance Light Rain
|
49°F |
2 to 8 mph
SW
|
|
Sunday Night
Nov 8
|
Mostly Cloudy
|
34°F |
0 to 3 mph
SSW
|
|
Monday
Nov 9
|
Partly Sunny
|
50°F |
1 mph
SE
|
|
Monday Night
Nov 9
|
Slight Chance Light Rain
|
38°F |
2 mph
S
|
|
Tuesday
Nov 10
|
Chance Light Rain
|
54°F |
3 mph
S
|
|
Tuesday Night
Nov 10
|
Slight Chance Light Rain
|
40°F |
3 mph
S
|
|
Veterans Day
Nov 11
|
Partly Sunny
|
58°F |
2 mph
SSE
|
|
Wednesday Night
Nov 11
|
Slight Chance Light Rain
|
40°F |
3 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Keystone.
Nearby forecast pages are not available for this location yet.