Sidney, MT Weather Forecast
Local 7-day forecast
Partly Sunny 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 rain showers between 2pm and 3pm, then a chance of showers and thunderstorms. Partly sunny. High near 73, with temperatures falling to around 69 in the afternoon. South southwest wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
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: May 19, 2026 4:10 PM MDT.
The active forecast window currently covers May 20 to May 25, 2026 for Sidney, MT.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 20 to May 25, 2026
- Latest sync
- May 19, 2026 4:10 PM MDT
- Forecast office
- GGW
- Source
- NOAA / NWS
Daily Outlook
This Week in Sidney
Memorial Day looks like the warmest upcoming period in Sidney at 89 degrees F.
Thursday Night is the coolest period ahead with temperatures near 40 degrees F.
The strongest winds are forecast for Memorial Day at about 5 to 17 mph SSW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- May 19, 2026 4:10 PM MDT
- Coverage
- 7 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 slight chance of rain showers before 9pm. Mostly cloudy, with a low around 41. West northwest wind 3 to 7 mph. Chance of precipitation is 20%.
A chance of rain showers. Mostly cloudy, with a high near 65. North wind 5 to 9 mph. Chance of precipitation is 50%.
A chance of rain showers. Mostly cloudy, with a low around 40. East southeast wind 3 to 8 mph. Chance of precipitation is 40%.
A slight chance of rain showers. Mostly sunny, with a high near 70. West northwest wind 3 to 8 mph. Chance of precipitation is 20%.
Partly cloudy, with a low around 41. South southeast wind 2 to 6 mph.
Mostly sunny, with a high near 77. Southwest wind 3 to 7 mph.
Partly cloudy, with a low around 48. Southeast wind around 6 mph.
Mostly sunny, with a high near 84. South southwest wind 6 to 13 mph, with gusts as high as 23 mph.
Partly cloudy, with a low around 50.
Mostly sunny, with a high near 89.
Partly cloudy, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
May 20
|
Partly Sunny then Chance Showers And Thunderstorms
|
73°F |
10 mph
SSW
|
|
Wednesday Night
May 20
|
Slight Chance Rain Showers then Mostly Cloudy
|
41°F |
3 to 7 mph
WNW
|
|
Thursday
May 21
|
Chance Rain Showers
|
65°F |
5 to 9 mph
N
|
|
Thursday Night
May 21
|
Chance Rain Showers
|
40°F |
3 to 8 mph
ESE
|
|
Friday
May 22
|
Slight Chance Rain Showers
|
70°F |
3 to 8 mph
WNW
|
|
Friday Night
May 22
|
Partly Cloudy
|
41°F |
2 to 6 mph
SSE
|
|
Saturday
May 23
|
Mostly Sunny
|
77°F |
3 to 7 mph
SW
|
|
Saturday Night
May 23
|
Partly Cloudy
|
48°F |
6 mph
SE
|
|
Sunday
May 24
|
Mostly Sunny
|
84°F |
6 to 13 mph
SSW
|
|
Sunday Night
May 24
|
Partly Cloudy
|
50°F |
5 to 10 mph
SSW
|
|
Memorial Day
May 25
|
Mostly Sunny
|
89°F |
5 to 17 mph
SSW
|
|
Monday Night
May 25
|
Partly Cloudy
|
55°F |
14 to 17 mph
SSW
|
Nearby Forecasts
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