Sweet Grass County, MT Weather Forecast
County weather hub
Sunny
Compare major city weather across Sweet Grass County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny. High near 49, with temperatures falling to around 44 in the afternoon. West southwest wind around 8 mph.
County Weather Overview
This county weather page brings together forecast coverage for Sweet Grass 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 Sweet Grass County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Oct 13 to Oct 19, 2026
- Latest sync
- Oct 13, 2026 7:42 PM MDT
- Forecast office
- BYZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Sweet Grass County
Saturday looks like the warmest upcoming period in Sweet Grass County at 74 degrees F.
Tonight is the coolest period ahead with temperatures near 30 degrees F.
The strongest winds are forecast for Saturday at about 20 to 24 mph WSW.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Oct 13, 2026 7:42 PM MDT
- Coverage
- 8 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, with a low around 30. West southwest wind around 9 mph.
Sunny. High near 64, with temperatures falling to around 54 in the afternoon. West southwest wind 9 to 17 mph.
Mostly cloudy, with a low around 34. West southwest wind around 13 mph.
Mostly sunny. High near 62, with temperatures falling to around 59 in the afternoon. South southeast wind 5 to 8 mph.
Mostly clear, with a low around 35. Southwest wind around 5 mph.
Sunny. High near 73, with temperatures falling to around 68 in the afternoon. West southwest wind 7 to 10 mph.
Mostly clear, with a low around 43. West southwest wind 6 to 18 mph.
Sunny. High near 74, with temperatures falling to around 68 in the afternoon. West southwest wind 20 to 24 mph.
Partly cloudy, with a low around 41. West southwest wind 10 to 15 mph.
Sunny. High near 66, with temperatures falling to around 62 in the afternoon. South southwest wind 5 to 8 mph.
Mostly clear, with a low around 42. South wind around 6 mph.
Sunny. High near 71, with temperatures falling to around 66 in the afternoon. Southwest wind around 7 mph.
A chance of rain showers after midnight. Partly cloudy, with a low around 43. Southwest wind around 6 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Oct 13
|
Sunny
|
49°F |
8 mph
WSW
|
|
Tonight
Oct 13
|
Mostly Clear
|
30°F |
9 mph
WSW
|
|
Wednesday
Oct 14
|
Sunny
|
64°F |
9 to 17 mph
WSW
|
|
Wednesday Night
Oct 14
|
Mostly Cloudy
|
34°F |
13 mph
WSW
|
|
Thursday
Oct 15
|
Mostly Sunny
|
62°F |
5 to 8 mph
SSE
|
|
Thursday Night
Oct 15
|
Mostly Clear
|
35°F |
5 mph
SW
|
|
Friday
Oct 16
|
Sunny
|
73°F |
7 to 10 mph
WSW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
43°F |
6 to 18 mph
WSW
|
|
Saturday
Oct 17
|
Sunny
|
74°F |
20 to 24 mph
WSW
|
|
Saturday Night
Oct 17
|
Partly Cloudy
|
41°F |
10 to 15 mph
WSW
|
|
Sunday
Oct 18
|
Sunny
|
66°F |
5 to 8 mph
SSW
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
42°F |
6 mph
S
|
|
Monday
Oct 19
|
Sunny
|
71°F |
7 mph
SW
|
|
Monday Night
Oct 19
|
Partly Cloudy then Chance Rain Showers
|
43°F |
6 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across Sweet Grass County.
Coverage
Forecast coverage currently spans 1 of 1 mapped cities in Sweet Grass County.
Largest mapped city population in this region: 1,688.
