Big Sky, MT Weather

Gallatin County3:28 PM MDT45.28°N, 111.37°WElevation 7,218 ft

Current conditions

Sunny
54°
Sunny
Feels like 54°
High 57°·Low 38°
WindSSW 1 mph
Humidity61%
Dew point41°
Cloud cover20%
UV index3 Moderate
Sunrise7:50 AM
Sunset6:31 PM

Observed at Yellowstone Club - Base Area · 1 hr ago

Forecast

10-day

  • This Afternoon

    Sunny, with a high near 57. South southwest wind around 7 mph, with gusts as high as 20 mph.

  • Tonight

    Mostly clear, with a low around 38. Southeast wind around 6 mph.

  • Thursday

    Mostly sunny, with a high near 59. Southeast wind 3 to 7 mph, with gusts as high as 20 mph.

National Weather Service forecast updated 2 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 57°
  2. 4 PM Sunny 57°
  3. 5 PM Sunny 56°
  4. 6 PM Mostly Clear 54°
  5. 7 PM Mostly Clear 51°
  6. 8 PM Mostly Clear 47°
  7. 9 PM Mostly Clear 46°
  8. 10 PM Mostly Clear 45°
  9. 11 PM Mostly Clear 44°
  10. Thu12 AM Clear 44°
  11. 1 AM Mostly Clear 43°
  12. 2 AM Mostly Clear 42°
  13. 3 AM Mostly Clear 41°
  14. 4 AM Mostly Clear 41°
  15. 5 AM Mostly Clear 40°
  16. 6 AM Mostly Sunny 40°
  17. 7 AM Mostly Sunny 39°
  18. 8 AM Mostly Sunny 38°
  19. 9 AM Sunny 40°
  20. 10 AM Sunny 45°
  21. 11 AM Sunny 49°
  22. 12 PM Sunny 54°
  23. 1 PM Mostly Sunny 57°
  24. 2 PM Sunny 58°

10-day forecast

Details
  1. TodayOct 21 Sunny Sunny38°57°
  2. ThuOct 22 Mostly Sunny Mostly Sunny64%40°59°
  3. FriOct 23 Rain Rain1.8 in snow99%24°44°
  4. SatOct 24 Mostly Sunny Mostly Sunny<0.1 in snow25°41°
  5. SunOct 25 Mostly Sunny Mostly Sunny12%26°45°
  6. MonOct 26 Slight Chance Light Snow Slight Chance Light Snow29%27°46°
  7. TueOct 27 Chance Light Snow Chance Light Snow0.4 in snow32%24°43°
  8. WedOct 28 Snow Snow0.25 in19°30°
  9. ThuOct 29 Partly cloudy Partly cloudy20°39°
  10. FriOct 30 Partly cloudy Partly cloudy20°42°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

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Sun & moon

Sunrise 7:50 AM
Sunset 6:31 PM
Daylight 10 h 41 min (−3 min 0 s tomorrow)
Waxing Gibbous · 80% lit
Moonrise 4:25 PM Moonset 2:41 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low57° / 37°
Record high76° (1927)
Record low18° (1984)
Wettest1.02 in (1953)
Month to date1.51 in (normal 1.17 in)

Norris Madison Power House, records since 1907. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in TFX, issued 4 hrs ago

Key Messages

- It will be mostly dry across North-central, Central, and Southwestern Montana through the day on Thursday.

- It will be windy across North-central Montana on Friday.

- Widespread precipitation returns late Thursday through Friday.

- Temperatures will be well-above seasonal averages through Thursday with temperatures cooling down Friday through this weekend.

Discussion

/Issued 501 AM MDT Wed Oct 21 2026/

- Meteorological Overview:

Today over Southwestern Montana there remains Southwest flow aloft with weak zonal flow (west-east) over North-central, and Central Montana. Due to slightly stronger warm air advection today temperatures will rebound to above seasonal averages. Across North- central and Central Montana it will be dry with a low chance for showers across Southwestern Montana today. See the Forecast Confidence & Scenarios Section for details. On Thursday there remains southerly flow aloft and an upper-level trough associated with a Pacific Cold front begins to move over North-central, Central, and Southwestern Montana by Thursday evening. This will allow temperatures to remain above seasonal averages with mostly dry weather until Thursday evening. Thursday evening into Friday morning precipitation will gradually spread over North-central, Central, and Southwestern Montana.

On Friday the upper-level trough merges with a shortwave trough moving south from Canada. This combined with the cold front that moved through will bring widespread precipitation and cooler temperatures (below seasonal averages) to the area. Due to the cold front that moved through Thursday evening into Friday morning snow-levels will lower and the precipitation that falls in mountain areas on Friday will transition from rain to snow by Friday evening. On Friday there is an increasing pressure gradient and strong low-level and mid-level winds. This will bring windy conditions to North-central Montana on Friday. On Saturday an upper-level ridge begins to build in over North-central, Central, and Southwestern Montana. This will allow the area to dry out with cool temperatures lingering.

On Sunday the upper-level ridge remains over North-central, Central, and Southwestern Montana. This will keep dry and cool (below seasonal averages) weather for the area on Sunday. Monday through Tuesday an upper-level trough moves over North-central, Central, and Southwestern Montana. This will bring cooler temperatures and widespread precipitation to the area on Monday and Tuesday. -IG

- Forecast Confidence & Scenarios:

Aviation

21/18Z TAF Period

VFR conditions will continue at all terminals during this TAF period. Generally, cloud cover will be limited to a few high level clouds and winds will be mild. However, KWYS is expected to have a period of increased mid-level cloud cover between 0900-1600Z. -ESH

Preliminary Point Temps

GTF 45 74 42 50 / 0 0 30 100 CTB 39 70 38 46 / 0 0 60 90 HLN 39 71 43 51 / 10 0 40 100 BZN 38 70 40 51 / 0 0 30 100 WYS 29 62 32 46 / 10 10 70 100 DLN 38 66 41 48 / 10 0 80 100 HVR 37 73 40 55 / 0 0 20 100 LWT 45 75 43 52 / 0 0 20 100

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 4Search index and reflects what the press published. Terms of use.