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Great Falls, Montana 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Great Falls MT
National Weather Service Forecast for: Great Falls MT
Issued by: National Weather Service Great Falls, MT
Updated: 2:11 pm MDT Mar 30, 2025
 
Tonight

Tonight: Mostly cloudy, with a low around 27. East northeast wind 5 to 9 mph becoming calm  after midnight.
Mostly Cloudy

Monday

Monday: A slight chance of rain between 2pm and 3pm, then a chance of showers and thunderstorms after 3pm.  Partly sunny, with a high near 51. Calm wind becoming west 5 to 8 mph in the afternoon.  Chance of precipitation is 40%.
Mostly Cloudy
then Chance
Showers
Monday
Night
Monday Night: Rain likely before 3am, then a chance of rain and snow.  Mostly cloudy, with a low around 32. West northwest wind 5 to 8 mph becoming north northeast in the evening.  Chance of precipitation is 60%. Little or no snow accumulation expected.
Rain Likely
then Chance
Rain/Snow
Tuesday

Tuesday: Rain and snow likely, becoming all rain after noon.  Mostly cloudy, with a high near 47. Northwest wind 5 to 9 mph.  Chance of precipitation is 60%. Little or no snow accumulation expected.
Rain/Snow
Likely then
Rain Likely
Tuesday
Night
Tuesday Night: A chance of rain before 9pm, then a chance of rain and snow.  Mostly cloudy, with a low around 32. North wind 5 to 9 mph becoming west southwest after midnight.  Chance of precipitation is 40%. Little or no snow accumulation expected.
Chance
Rain/Snow
Wednesday

Wednesday: A slight chance of snow before noon, then a chance of rain.  Mostly cloudy, with a high near 50. West southwest wind 5 to 10 mph.  Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.
Slight Chance
Snow then
Chance Rain
Wednesday
Night
Wednesday Night: A chance of rain before 9pm, then a chance of rain and snow between 9pm and 3am, then a chance of snow after 3am.  Mostly cloudy, with a low around 28. North wind 6 to 9 mph.  Chance of precipitation is 30%. Little or no snow accumulation expected.
Chance
Rain/Snow
Thursday

Thursday: A chance of snow.  Mostly cloudy, with a high near 40. North northwest wind 6 to 9 mph.
Chance Snow

Thursday
Night
Thursday Night: A chance of snow.  Mostly cloudy, with a low around 25.
Chance Snow

Lo 27 °F Hi 51 °F Lo 32 °F Hi 47 °F Lo 32 °F Hi 50 °F Lo 28 °F Hi 40 °F Lo 25 °F

 

Tonight
 
Mostly cloudy, with a low around 27. East northeast wind 5 to 9 mph becoming calm after midnight.
Monday
 
A slight chance of rain between 2pm and 3pm, then a chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 51. Calm wind becoming west 5 to 8 mph in the afternoon. Chance of precipitation is 40%.
Monday Night
 
Rain likely before 3am, then a chance of rain and snow. Mostly cloudy, with a low around 32. West northwest wind 5 to 8 mph becoming north northeast in the evening. Chance of precipitation is 60%. Little or no snow accumulation expected.
Tuesday
 
Rain and snow likely, becoming all rain after noon. Mostly cloudy, with a high near 47. Northwest wind 5 to 9 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Tuesday Night
 
A chance of rain before 9pm, then a chance of rain and snow. Mostly cloudy, with a low around 32. North wind 5 to 9 mph becoming west southwest after midnight. Chance of precipitation is 40%. Little or no snow accumulation expected.
Wednesday
 
A slight chance of snow before noon, then a chance of rain. Mostly cloudy, with a high near 50. West southwest wind 5 to 10 mph. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.
Wednesday Night
 
A chance of rain before 9pm, then a chance of rain and snow between 9pm and 3am, then a chance of snow after 3am. Mostly cloudy, with a low around 28. North wind 6 to 9 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Thursday
 
A chance of snow. Mostly cloudy, with a high near 40. North northwest wind 6 to 9 mph.
Thursday Night
 
A chance of snow. Mostly cloudy, with a low around 25.
Friday
 
A slight chance of snow before noon. Mostly sunny, with a high near 46.
Friday Night
 
Partly cloudy, with a low around 26.
Saturday
 
Mostly sunny, with a high near 53.
Saturday Night
 
Mostly clear, with a low around 29.
Sunday
 
Sunny, with a high near 62.

 

Forecast from NOAA-NWS for Great Falls MT.

Weather Forecast Discussion
666
FXUS65 KTFX 301945
AFDTFX

Area Forecast Discussion
National Weather Service Great Falls MT
145 PM MDT Sun Mar 30 2025

.KEY MESSAGES...

- Spring storm to affect the southern half of the CWA Monday night
  into Tuesday night.

- Overall, afternoon temperatures not as warm as last week through
  at least Friday.

- Next weekend is looking nicer and a bit warmer.

&&

.DISCUSSION...

 - Meteorological Overview:
A few light snow showers/flurries continue to linger over portions
of the CWA this afternoon, as the upper level disturbance exits
the CWA to our east. The next upper level disturbance arrives on
Mon afternoon, with a chance for showers/isolated thunderstorms as
it moves northward from Southwest MT into Central MT. On Monday
night, a stronger upper level trof will move over the southern
portions of the CWA, with strong convective bands of precipitation
possible. These convective bands could produce some good snowfall
rates in the mountains. Thus a winter storm watch has been issued
for some mountain ranges of Central and Southwest MT. It is likely
that some winter weather advisories will also be needed for areas
surrounding the winter storm watch as well.

Overall, the steadier precipitation ends Tuesday night over
Southwest MT, with scattered rain/snow showers then continuing
into Friday. However, the precipitation will become more isolated
Thu/Fri. Afternoon temperatures will generally be below normal for
much of the CWA through the work week.

Looking ahead to next weekend, an upper level ridge of high
pressure will try to build into the CWA from the west, resulting
in drier/warmer conditions moving back into the CWA by next
Sunday.

 - Forecast Confidence & Scenarios:
The main concern is the snowfall potential Mon night into Tuesday
over Central and Southwest MT. There is a 60 percent chance
snowfall could exceed 6 inches in the mountains. Additionally,
there is a 10 percent chance snow amounts could exceed a foot.
This potential has lead to a winter storm watch for some mountain
areas of Central/Southwest MT. There is the potential for some
higher snowfall amounts in the Elkhorn Mountains as well, but with
no mountain passes directly affected by the higher snowfall
amounts, no watch will be issued at this time.

Of second concern, is the GFS model that has lower levels and
some convective snowfall in the Helena and Bozeman areas. This
potential will be watched closely as higher resolution models
become available for the possible need to expand the winter storm
watch. Brusda

&&

.AVIATION...
30/18Z TAF Period

The initial concern this TAF period is for lingering light snow
and low clouds. Remaining snow is forecast to diminish this
afternoon, with ceilings slowly rising in most areas. Additional
low clouds will be a concern this evening and tonight, mostly
across the plains, but in some southwest MT valleys as well. Fog
will be a concern where skies at least briefly clear a bit tonight
on the plains. -AM

Refer to weather.gov/zlc for more detailed regional aviation
weather and hazard information.

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  27  49  33  46 /   0  40  60  60
CTB  25  44  29  47 /   0  30  20  30
HLN  30  50  32  44 /  10  60  60  60
BZN  26  49  27  40 /  10  50  60  70
WYS  22  40  19  36 /  70  70  70  80
DLN  27  46  28  38 /  10  40  50  50
HVR  24  50  29  46 /   0  20  30  40
LWT  25  47  28  39 /  10  40  60  70

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
Winter Storm Watch from Monday evening through Tuesday evening
for Big Belt, Bridger and Castle Mountains-Gallatin and Madison
County Mountains and Centennial Mountains-Little Belt and
Highwood Mountains.

&&

$$
http://www.weather.gov/greatfalls
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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