Sidney, MT Weather Forecast
Local 7-day forecast
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Sidney, MT in one place.
A slight chance of showers and thunderstorms between 7am and 9am, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 85. North northeast wind 2 to 9 mph. Chance of precipitation is 40%.
Local Weather Overview
This forecast page for Sidney, 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: Aug 27, 2026 6:17 PM MDT.
The active forecast window currently covers Aug 29 to Sep 2, 2026 for Sidney, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 29 to Sep 2, 2026
- Latest sync
- Aug 27, 2026 6:17 PM MDT
- Forecast office
- GGW
- Source
- NOAA / NWS
Daily Outlook
This Week in Sidney
Wednesday looks like the warmest upcoming period in Sidney at 87 degrees F.
Sunday Night is the coolest period ahead with temperatures near 51 degrees F.
The strongest winds are forecast for Monday at about 12 to 21 mph WSW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 27, 2026 6:17 PM MDT
- Coverage
- 6 days
- Time zone
- America/Denver
- Forecast office
- GGW
- Radar station
- KGGW
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of showers and thunderstorms before midnight, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 56. East northeast wind 3 to 9 mph. Chance of precipitation is 40%.
A chance of rain showers before 9am, then showers and thunderstorms likely. Partly sunny, with a high near 81. South southeast wind 2 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
A chance of rain showers. Partly cloudy, with a low around 51. West wind 9 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.
Sunny, with a high near 80. West southwest wind 12 to 21 mph, with gusts as high as 36 mph.
Mostly clear, with a low around 52. West wind 3 to 14 mph, with gusts as high as 24 mph.
A slight chance of rain showers before noon. Sunny, with a high near 85. South southeast wind 3 to 10 mph, with gusts as high as 20 mph.
Mostly clear, with a low around 54.
Mostly sunny, with a high near 87.
A slight chance of rain showers. Partly cloudy, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Aug 29
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
85°F |
2 to 9 mph
NNE
|
|
Saturday Night
Aug 29
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
56°F |
3 to 9 mph
ENE
|
|
Sunday
Aug 30
|
Showers And Thunderstorms Likely
|
81°F |
2 to 15 mph
SSE
|
|
Sunday Night
Aug 30
|
Chance Rain Showers
|
51°F |
9 to 17 mph
W
|
|
Monday
Aug 31
|
Sunny
|
80°F |
12 to 21 mph
WSW
|
|
Monday Night
Aug 31
|
Mostly Clear
|
52°F |
3 to 14 mph
W
|
|
Tuesday
Sep 1
|
Slight Chance Rain Showers then Sunny
|
85°F |
3 to 10 mph
SSE
|
|
Tuesday Night
Sep 1
|
Mostly Clear
|
54°F |
5 to 10 mph
ESE
|
|
Wednesday
Sep 2
|
Mostly Sunny
|
87°F |
5 to 10 mph
SW
|
|
Wednesday Night
Sep 2
|
Slight Chance Rain Showers
|
55°F |
5 to 10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Sidney.
Nearby forecast pages are not available for this location yet.
