Helena, MT 59620 Weather

Lewis and Clark County4:19 AM MDT46.59°N, 112.04°W

Current conditions

Clear
39°
Clear
Feels like 39°
High 66°·Low 36° tonight
WindCalm
Humidity87%
Dew point36°
Visibility10 mi
Cloud cover13%
UV index0 Low
Sunrise7:55 AM
Sunset6:32 PM

Observed at Helena Regional Airport · 1 hr ago

Forecast

10-day

  • Overnight

    Mostly clear. Low around 36, with temperatures rising to around 39 overnight. Southwest wind around 2 mph.

  • Wednesday

    Sunny, with a high near 66. South southeast wind 1 to 6 mph.

  • Wednesday Night

    Mostly clear, with a low around 44. Southwest wind 2 to 6 mph.

National Weather Service forecast updated 3 hrs ago.

Hourly

Hourly forecast
  1. Now Mostly Clear 40°
  2. 5 AM Mostly Clear 39°
  3. 6 AM Sunny 38°
  4. 7 AM Mostly Sunny 36°
  5. 8 AM Mostly Sunny 37°
  6. 9 AM Sunny 39°
  7. 10 AM Sunny 44°
  8. 11 AM Sunny 48°
  9. 12 PM Sunny 50°
  10. 1 PM Sunny 56°
  11. 2 PM Sunny 59°
  12. 3 PM Sunny 63°
  13. 4 PM Sunny 64°
  14. 5 PM Sunny 65°
  15. 6 PM Mostly Clear 64°
  16. 7 PM Mostly Clear 62°
  17. 8 PM Mostly Clear 60°
  18. 9 PM Mostly Clear 57°
  19. 10 PM Partly Cloudy 55°
  20. 11 PM Mostly Clear 54°
  21. Thu12 AM Mostly Clear 53°
  22. 1 AM Mostly Clear 53°
  23. 2 AM Mostly Clear 51°
  24. 3 AM Mostly Clear 49°

10-day forecast

Details
  1. TonightOct 20 Mostly Clear Mostly Clear36°
  2. TodayOct 21 Sunny Sunny44°66°
  3. ThuOct 22 Sunny Sunny42%42°69°
  4. FriOct 23 Rain Rain99%32°49°
  5. SatOct 24 Mostly Sunny Mostly Sunny29°46°
  6. SunOct 25 Partly Sunny Partly Sunny12%29°44°
  7. MonOct 26 Partly Sunny Partly Sunny<0.1 in snow13%31°45°
  8. TueOct 27 Slight Chance Light Snow Slight Chance Light Snow23%49°
  9. WedOct 28 Partly cloudy Partly cloudy27°53°
  10. ThuOct 29 Cloudy Cloudy29°50°

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 near Helena

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Air quality

26
Good
Fine particles (PM2.5)

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

Helena, 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 7:55 AM
Sunset 6:32 PM
Daylight 10 h 37 min (−3 min 10 s tomorrow)
Waxing Gibbous · 76% lit
Moonrise 4:29 PM Moonset 2:42 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low55° / 31°
Record high82° (2003)
Record low15° (1984)
Wettest0.63 in (1975)
Month to date1.02 in (normal 0.53 in)

Helena Area, records since 1880. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in TFX, issued 2 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

- 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:

Today across Southwestern Montana along the Idaho/Montana Border there is a 10% chance for a tenth of rain or greater. On Friday there is a 40 - 65% chance for wind gusts of 45 mph or greater across much of North-central Montana. On Friday along the Rocky Mountain Front and plains west of I-15 there is a 30 - 50% chance for wind gusts of 55 mph or greater.

Aviation

21/06Z TAF Period

VFR conditions prevail through the TAF period. Surface winds will remain fairly light, increasing into the afternoon hours area wide. Few to scattered mid-level clouds will be prevalent through the TAF period. Across Southwest Montana, a few cumulus during the peak heating hours are possible which may bring slightly lower cloud bases. -JR

Preliminary Point Temps

GTF 73 45 74 42 / 0 0 0 30 CTB 68 39 70 38 / 0 0 0 60 HLN 69 39 71 43 / 10 10 0 40 BZN 67 38 70 40 / 10 0 0 30 WYS 60 29 62 32 / 30 10 10 70 DLN 65 38 66 41 / 20 10 0 80 HVR 69 37 73 40 / 0 0 0 20 LWT 71 45 75 43 / 0 0 0 20

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.