Custer County, MT Weather Forecast
County weather hub
Mostly Cloudy
Compare major city weather across Custer County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly cloudy, with a low around 63. South southeast wind around 1 mph.
County Weather Overview
This county weather page brings together forecast coverage for Custer County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 1 of 1 mapped cities in Custer County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 29 to Sep 4, 2026
- Latest sync
- Aug 29, 2026 6:17 AM MDT
- Forecast office
- BYZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Custer County
Wednesday looks like the warmest upcoming period in Custer County at 90 degrees F.
Sunday Night is the coolest period ahead with temperatures near 50 degrees F.
The strongest winds are forecast for Sunday at about 2 to 13 mph WSW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 29, 2026 6:17 AM MDT
- Coverage
- 7 days
- Time zone
- America/Denver
- Forecast office
- BYZ
- Radar station
- KGGW
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms after 3pm. Mostly cloudy. High near 86, with temperatures falling to around 84 in the afternoon. Southwest wind 1 to 6 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms between 8pm and 9pm. Partly cloudy, with a low around 58. North northwest wind 1 to 6 mph. Chance of precipitation is 40%.
A chance of rain showers between 8am and noon, then a chance of showers and thunderstorms between noon and 3pm, then a chance of showers and thunderstorms between 3pm and 5pm. Mostly cloudy. High near 79, with temperatures falling to around 74 in the afternoon. West southwest wind 2 to 13 mph. Chance of precipitation is 50%.
Mostly clear, with a low around 50. West southwest wind 3 to 10 mph.
Sunny, with a high near 81. West southwest wind 3 to 10 mph.
Partly cloudy, with a low around 54. East northeast wind around 6 mph.
Mostly sunny, with a high near 87. Southeast wind 3 to 8 mph.
Mostly clear, with a low around 57. Southeast wind 6 to 13 mph.
Mostly sunny, with a high near 90. South wind 5 to 12 mph.
Partly cloudy, with a low around 58. West wind 6 to 9 mph.
Mostly sunny, with a high near 89. West southwest wind 5 to 9 mph.
Partly cloudy, with a low around 58. East northeast wind around 12 mph.
Sunny, with a high near 87. West wind 3 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Aug 29
|
Mostly Cloudy
|
63°F |
1 mph
SSE
|
|
Saturday
Aug 29
|
Mostly Cloudy then Slight Chance Showers And Thunderstorms
|
86°F |
1 to 6 mph
SW
|
|
Saturday Night
Aug 29
|
Chance Showers And Thunderstorms then Partly Cloudy
|
58°F |
1 to 6 mph
NNW
|
|
Sunday
Aug 30
|
Chance Rain Showers
|
79°F |
2 to 13 mph
WSW
|
|
Sunday Night
Aug 30
|
Mostly Clear
|
50°F |
3 to 10 mph
WSW
|
|
Monday
Aug 31
|
Sunny
|
81°F |
3 to 10 mph
WSW
|
|
Monday Night
Aug 31
|
Partly Cloudy
|
54°F |
6 mph
ENE
|
|
Tuesday
Sep 1
|
Mostly Sunny
|
87°F |
3 to 8 mph
SE
|
|
Tuesday Night
Sep 1
|
Mostly Clear
|
57°F |
6 to 13 mph
SE
|
|
Wednesday
Sep 2
|
Mostly Sunny
|
90°F |
5 to 12 mph
S
|
|
Wednesday Night
Sep 2
|
Partly Cloudy
|
58°F |
6 to 9 mph
W
|
|
Thursday
Sep 3
|
Mostly Sunny
|
89°F |
5 to 9 mph
WSW
|
|
Thursday Night
Sep 3
|
Partly Cloudy
|
58°F |
12 mph
ENE
|
|
Friday
Sep 4
|
Sunny
|
87°F |
3 to 7 mph
W
|
Major City Forecasts
Live forecast snapshots for major cities across Custer County.
Coverage
Forecast coverage currently spans 1 of 1 mapped cities in Custer County.
Largest mapped city population in this region: 8,264.
