Sun Prairie, MT Weather

Cascade County4:47 PM MDT47.54°N, 111.48°WElevation 3,340 ft

Current conditions

Sunny
73°
Sunny
Feels like 73°
High 74°·Low 42°
WindSSW 9 mph gusts 17 mph
Humidity29%
Dew point39°
Visibility10 mi
Cloud cover5%
UV index1 Low
Sunrise7:54 AM
Sunset6:28 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Wednesday

    Sunny. High near 74, with temperatures falling to around 71 in the afternoon. South southwest wind 2 to 10 mph, with gusts as high as 18 mph.

  • Wednesday Night

    Mostly clear. Low around 42, with temperatures rising to around 45 overnight. South southwest wind around 5 mph.

  • Thursday

    Sunny, with a high near 75. South southwest wind around 5 mph.

National Weather Service forecast updated 21 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 73°
  2. 5 PM Sunny 71°
  3. 6 PM Mostly Clear 68°
  4. 7 PM Mostly Clear 64°
  5. 8 PM Mostly Clear 57°
  6. 9 PM Mostly Clear 55°
  7. 10 PM Mostly Clear 53°
  8. 11 PM Mostly Clear 51°
  9. Thu12 AM Partly Cloudy 49°
  10. 1 AM Partly Cloudy 48°
  11. 2 AM Partly Cloudy 48°
  12. 3 AM Mostly Clear 47°
  13. 4 AM Mostly Clear 46°
  14. 5 AM Mostly Clear 45°
  15. 6 AM Mostly Sunny 44°
  16. 7 AM Mostly Sunny 43°
  17. 8 AM Mostly Sunny 44°
  18. 9 AM Mostly Sunny 47°
  19. 10 AM Mostly Sunny 52°
  20. 11 AM Mostly Sunny 59°
  21. 12 PM Sunny 66°
  22. 1 PM Sunny 70°
  23. 2 PM Sunny 73°
  24. 3 PM Sunny 74°

10-day forecast

Details
  1. TonightOct 20 Mostly Clear Mostly Clear36°
  2. TodayOct 21 Sunny Sunny42°74°
  3. ThuOct 22 Sunny Sunny36%42°75°
  4. FriOct 23 Rain Rain93%31°53°
  5. SatOct 24 Mostly Sunny Mostly Sunny13%28°49°
  6. SunOct 25 Slight Chance Light Snow then Partly Sunny Slight Chance Light Snow then Partly Sunny16%25°43°
  7. MonOct 26 Partly Sunny Partly Sunny15%27°46°
  8. TueOct 27 Partly Sunny Partly Sunny13%49°
  9. WedOct 28 Mostly sunny Mostly sunny28°56°
  10. ThuOct 29 Cloudy Cloudy29°46°

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

Radar

Full map
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Weather news in Montana

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Air quality

26
Good
Fine particles (PM2.5)

Air quality is satisfactory, and air pollution poses little or no risk.

Great Falls, MT reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:54 AM
Sunset 6:28 PM
Daylight 10 h 34 min (−3 min 16 s tomorrow)
Waxing Gibbous · 80% lit
Moonrise 4:28 PM Moonset 2:38 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low54° / 31°
Record high79° (2003)
Record low14° (1984)
Wettest0.46 in (1975)
Month to date2.15 in (normal 0.75 in)

Great Falls Airport, records since 1937. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in TFX, issued 5 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 4Conservative index and reflects what the press published. Terms of use.