Sweet Grass County, MT Weather Forecast
County weather hub
Partly Sunny then Chance Rain Showers
Compare major city weather across Sweet Grass County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of rain showers after noon. Partly sunny. High near 72, with temperatures falling to around 70 in the afternoon. Southwest wind 8 to 23 mph. Chance of precipitation is 30%.
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
- Apr 11 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 5:47 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 72 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 32 degrees F.
The strongest winds are forecast for Wednesday at about 13 to 28 mph WSW.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 5:47 PM MDT
- Coverage
- 6 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
A chance of rain showers before midnight. Mostly cloudy. Low around 45, with temperatures rising to around 47 overnight. West southwest wind 14 to 21 mph. Chance of precipitation is 30%.
Showers and thunderstorms likely after noon. Partly sunny. High near 66, with temperatures falling to around 63 in the afternoon. Southwest wind 10 to 15 mph. Chance of precipitation is 70%.
Rain showers likely. Mostly cloudy, with a low around 41. South wind 7 to 13 mph. Chance of precipitation is 70%.
Rain showers. Mostly cloudy. High near 59, with temperatures falling to around 57 in the afternoon. West southwest wind 9 to 16 mph. Chance of precipitation is 80%.
Rain showers likely. Mostly cloudy, with a low around 39. West wind 7 to 14 mph. Chance of precipitation is 60%.
A chance of rain showers. Partly sunny, with a high near 60. West wind 8 to 18 mph. Chance of precipitation is 30%.
A slight chance of rain showers before midnight. Partly cloudy. Low around 39, with temperatures rising to around 41 overnight. West southwest wind 12 to 18 mph. Chance of precipitation is 20%.
A chance of rain showers. Mostly cloudy. High near 57, with temperatures falling to around 55 in the afternoon. West southwest wind 13 to 28 mph, with gusts as high as 40 mph. Chance of precipitation is 50%.
Rain showers likely before 9pm, then rain and snow showers likely. Mostly cloudy. Low around 32, with temperatures rising to around 35 overnight. West wind 14 to 23 mph. New snow accumulation of less than half an inch possible.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 11
|
Partly Sunny then Chance Rain Showers
|
72°F |
8 to 23 mph
SW
|
|
Saturday Night
Apr 11
|
Chance Rain Showers then Mostly Cloudy
|
45°F |
14 to 21 mph
WSW
|
|
Sunday
Apr 12
|
Partly Sunny then Showers And Thunderstorms Likely
|
66°F |
10 to 15 mph
SW
|
|
Sunday Night
Apr 12
|
Rain Showers Likely
|
41°F |
7 to 13 mph
S
|
|
Monday
Apr 13
|
Rain Showers
|
59°F |
9 to 16 mph
WSW
|
|
Monday Night
Apr 13
|
Rain Showers Likely
|
39°F |
7 to 14 mph
W
|
|
Tuesday
Apr 14
|
Chance Rain Showers
|
60°F |
8 to 18 mph
W
|
|
Tuesday Night
Apr 14
|
Slight Chance Rain Showers then Partly Cloudy
|
39°F |
12 to 18 mph
WSW
|
|
Wednesday
Apr 15
|
Chance Rain Showers
|
57°F |
13 to 28 mph
WSW
|
|
Wednesday Night
Apr 15
|
Rain And Snow Showers Likely
|
32°F |
14 to 23 mph
W
|
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.
