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Sidney, MT Weather
Current conditions
Observed at Sidney-Richland · 52 min ago
Forecast
10-day-
Overnight
Mostly clear, with a low around 39. South wind 2 to 6 mph.
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Tuesday
Mostly sunny, with a high near 66. Southwest wind 0 to 8 mph.
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Tuesday Night
Mostly clear, with a low around 32. North wind 2 to 6 mph.
National Weather Service forecast updated 2 hrs ago.
Hourly
Hourly forecast- Now43°
- 4 AM40°
- 5 AM39°
- 6 AM39°
- 7 AM39°
- 8 AM39°
- 9 AM42°
- 10 AM48°
- 11 AM54°
- 12 PM58°
- 1 PM63°
- 2 PM64°
- 3 PM65°
- 4 PM66°
- 5 PM64°
- 6 PM59°
- 7 PM56°
- 8 PM50°
- 9 PM47°
- 10 PM45°
- 11 PM43°
- Wed12 AM41°
- 1 AM40°
- 2 AM39°
10-day forecast
Details- TonightOct 19Mostly Clear39°
- TodayOct 20Mostly Sunny32°66°
- WedOct 21Mostly Sunny43°66°
- ThuOct 22Sunny48°74°
- FriOct 23Partly Sunny then Slight Chance Light Rain55%35°75°
- SatOct 24Partly Sunny13%26°50°
- SunOct 25Mostly Sunny26°50°
- MonOct 26Partly Sunny48°
- TueOct 27Cloudy30°54°
- WedOct 28Partly cloudy36°56°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news in Montana
More weather news-
Gusty winds expected on Saturday in western MontanaKPAX News Gusty winds expected on Saturday in western Montana A mid-level jet streak will move over northern Montana on Saturday. This will bring stornger winds back to the area, with 30-40 MPH maximum gusts possible…
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Wind and temperatures on the rise for the weekend in MontanaNonstop Local News Montana Today, we saw dense fog in western valleys this morning This yielded to widespread sunshine in the afternoon across the region Highs reached the 50s in most major areas, which is normal for…
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[VIDEOS] Skiers Score Early-Season Powder in Montana After October StormMontana skiers didn’t wait for the chairlifts. On Monday, October 12, skiers and riders hiked for fresh turns at Showdown and Bridger Bowl after a weekend Montana snowstorm buried parts of the state. Nearby SNOTEL sites…
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Snow cover across parts of Montana5-minute CONUS Sector GOES-19 (GOES-East) Day Snow-Fog RGB images (above) displayed the signature of snow cover (shades of red) across parts of Montana on 13 October 2026. This was remnant snow cover that fell 2 days…
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Dog has zero chill about Montana’s first snow of the seasonThe Weather Channel Snow much fun! Dog frolics in Montana’s first big snow of the season A dog frolics in fresh snow in a Helena, Montana, backyard after the season's first winter storm blanketed much of the state with…
Sun & moon
Almanac
MonthlySidney, records since 1910. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Forecasters' discussion
From the National Weather Service office in GGW, issued 4 hrs ago
Key Messages
- Dry weather conditions will continue along with seasonable temperatures through the midweek.
- Precipitation chances look to increase late Thursday night into Friday.
- Cooler and drier weather expected for the weekend.
Discussion
Gusty southeast winds that had preceded the approaching upper ridge have diminished across the area allowing the Lake Wind Advisory that had been in effect across Fort Peck Lake to expire on time. Next, attention focuses on seasonably warm and dry weather as the ridge translates east through the midweek across NE Montana. High temperatures will peak on Thursday as the ridge axis begins to push downstream of the CWA.
Meanwhile, a deepening upper level trough will send southerly upper level flow across the region as a surface cold front slides through Thursday night and Friday. As Pacific moisture advances ahead of this trough, rain chances will increase behind the front Thursday night into Friday before shifting east by Saturday morning. Current ensemble means depict a quarter to a half of an inch over the CWA with lesser amounts toward Wibaux.
Look for drier albeit far cooler weather conditions for the weekend behind the departing system.
FORECAST CONFIDENCE & DEVIATIONS:
NBM held the line this forecast cycle capturing large scale trends in the short to medium term efficiently given the benign weather expected with the upper level ridge. Confidence continues to increase on precipitation chances by Friday, though details on precipitation timing and placement as well as specific amounts will come into focus as the event heads into the short term and is better resolved by high resolution models.
Aviation
LAST UPDATED: Tuesday October 20, 2026 at 0400Z.
FLIGHT CAT RANGE: VFR.
DISCUSSION: Upper ridging will guide seasonably mild and dry conditions through the midweek.
WIND: Light and variable winds will become north to northeast at 5 to 9 kts after 18Z Tuesday.
LLWS: Low level wind shear is possible Tuesday morning near KSDY and KGDV but should diminish during the afternoon.
Ggw Watches
None.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.