Sweet Grass County, MT Weather Forecast
County weather hub
Mostly Sunny then Scattered Showers And Thunderstorms
Compare major city weather across Sweet Grass County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Scattered showers and thunderstorms after 3pm. Mostly sunny. High near 95, with temperatures falling to around 91 in the afternoon. East wind 10 to 14 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
- Jul 14 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 1:09 PM MDT
- Forecast office
- BYZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Sweet Grass County
Today looks like the warmest upcoming period in Sweet Grass County at 95 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Today at about 10 to 14 mph E.
Precipitation is mentioned in 14 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 1:09 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
Scattered showers and thunderstorms before 9pm, then scattered showers and thunderstorms between 9pm and 10pm, then isolated showers and thunderstorms between 10pm and midnight. Partly cloudy. Low around 63, with temperatures rising to around 65 overnight. West wind 6 to 13 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms after noon. Partly sunny. High near 86, with temperatures falling to around 81 in the afternoon. North northeast wind around 8 mph. Chance of precipitation is 50%.
Showers and thunderstorms likely before midnight. Mostly cloudy, with a low around 60. East wind 2 to 7 mph. Chance of precipitation is 60%.
A chance of showers and thunderstorms between noon and 3pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 87. East wind 2 to 10 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 9pm, then a chance of showers and thunderstorms between 9pm and midnight. Partly cloudy, with a low around 61. East northeast wind 2 to 12 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 93. Northeast wind 2 to 12 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 62. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 93. West wind 5 to 9 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before midnight. Mostly cloudy. Low around 62, with temperatures rising to around 64 overnight. North northwest wind 6 to 12 mph. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 93. West wind 5 to 9 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 61. West northwest wind 5 to 12 mph. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 90. South wind 3 to 10 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 61. Northeast wind 5 to 12 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Jul 14
|
Mostly Sunny then Scattered Showers And Thunderstorms
|
95°F |
10 to 14 mph
E
|
|
Tonight
Jul 14
|
Scattered Showers And Thunderstorms then Partly Cloudy
|
63°F |
6 to 13 mph
W
|
|
Wednesday
Jul 15
|
Partly Sunny then Chance Showers And Thunderstorms
|
86°F |
8 mph
NNE
|
|
Wednesday Night
Jul 15
|
Showers And Thunderstorms Likely then Mostly Cloudy
|
60°F |
2 to 7 mph
E
|
|
Thursday
Jul 16
|
Mostly Sunny then Chance Showers And Thunderstorms
|
87°F |
2 to 10 mph
E
|
|
Thursday Night
Jul 16
|
Chance Showers And Thunderstorms then Partly Cloudy
|
61°F |
2 to 12 mph
ENE
|
|
Friday
Jul 17
|
Mostly Sunny then Chance Showers And Thunderstorms
|
93°F |
2 to 12 mph
NE
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
62°F |
5 to 10 mph
SW
|
|
Saturday
Jul 18
|
Mostly Sunny then Chance Showers And Thunderstorms
|
93°F |
5 to 9 mph
W
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
62°F |
6 to 12 mph
NNW
|
|
Sunday
Jul 19
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
93°F |
5 to 9 mph
W
|
|
Sunday Night
Jul 19
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
61°F |
5 to 12 mph
WNW
|
|
Monday
Jul 20
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
90°F |
3 to 10 mph
S
|
|
Monday Night
Jul 20
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
61°F |
5 to 12 mph
NE
|
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.
