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Hamilton, Montana 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Hamilton MT
National Weather Service Forecast for: Hamilton MT
Issued by: National Weather Service Missoula, MT
Updated: 2:30 pm MDT Jul 25, 2025
 
Overnight

Overnight: Areas of smoke after 5am. Mostly clear, with a low around 53. Light south southeast wind.
Areas Smoke

Saturday

Saturday: A 30 percent chance of showers and thunderstorms after noon.  Areas of smoke before 10am. Mostly sunny, with a high near 89. Light and variable wind becoming west northwest 12 to 17 mph in the afternoon. Winds could gust as high as 24 mph.
Areas Smoke
then Chance
Showers
Saturday
Night
Saturday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of rain between 9pm and midnight.  Areas of smoke between 9pm and 1am. Partly cloudy, with a low around 53. South southwest wind 15 to 20 mph becoming light  in the evening. Winds could gust as high as 28 mph.  Chance of precipitation is 20%.
Slight Chance
T-storms then
Areas Smoke
Sunday

Sunday: A 40 percent chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 87. Calm wind becoming southwest around 6 mph in the afternoon.
Sunny then
Chance
T-storms
Sunday
Night
Sunday Night: A 30 percent chance of rain before midnight.  Partly cloudy, with a low around 54. West northwest wind around 6 mph becoming calm  in the evening.
Chance Rain
then Partly
Cloudy
Monday

Monday: A 30 percent chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 88.
Sunny then
Chance
T-storms
Monday
Night
Monday Night: A 20 percent chance of rain before midnight.  Partly cloudy, with a low around 53.
Slight Chance
Rain then
Partly Cloudy
Tuesday

Tuesday: Mostly sunny, with a high near 88.
Mostly Sunny

Tuesday
Night
Tuesday Night: A chance of rain before midnight.  Mostly cloudy, with a low around 55.
Chance Rain
then Partly
Cloudy
Lo 53 °F Hi 89 °F Lo 53 °F Hi 87 °F Lo 54 °F Hi 88 °F Lo 53 °F Hi 88 °F Lo 55 °F

 

Overnight
 
Areas of smoke after 5am. Mostly clear, with a low around 53. Light south southeast wind.
Saturday
 
A 30 percent chance of showers and thunderstorms after noon. Areas of smoke before 10am. Mostly sunny, with a high near 89. Light and variable wind becoming west northwest 12 to 17 mph in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
 
A slight chance of showers and thunderstorms before 9pm, then a slight chance of rain between 9pm and midnight. Areas of smoke between 9pm and 1am. Partly cloudy, with a low around 53. South southwest wind 15 to 20 mph becoming light in the evening. Winds could gust as high as 28 mph. Chance of precipitation is 20%.
Sunday
 
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 87. Calm wind becoming southwest around 6 mph in the afternoon.
Sunday Night
 
A 30 percent chance of rain before midnight. Partly cloudy, with a low around 54. West northwest wind around 6 mph becoming calm in the evening.
Monday
 
A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 88.
Monday Night
 
A 20 percent chance of rain before midnight. Partly cloudy, with a low around 53.
Tuesday
 
Mostly sunny, with a high near 88.
Tuesday Night
 
A chance of rain before midnight. Mostly cloudy, with a low around 55.
Wednesday
 
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 89.
Wednesday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Thursday
 
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Thursday Night
 
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Friday
 
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83.

 

Forecast from NOAA-NWS for Hamilton MT.

Weather Forecast Discussion
939
FXUS65 KMSO 251851
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
1251 PM MDT Fri Jul 25 2025

.DISCUSSION...

KEY MESSAGES:

-  Thunderstorm chances will gradually increase each day, moving
   from south to north, beginning today and continuing into next
   week. If you`re planning outdoor activities, be prepared to
   seek shelter or find a safe place if you hear thunder.

-  Strong outflow wind threat (50+ mph) with any thunderstorms
   this afternoon through the weekend.

Beginning today and continuing through much of next week, a transition to
southwesterly flow aloft will become established. This pattern
will support the arrival of periodic weak disturbances and
increasing mid-level moisture, leading to a gradual northward
expansion of daily thunderstorm coverage. Thunderstorm coverage
today will be across Lemhi County and southwest Montana (perhaps
even the southern Bitterroot Valley), shifting northward into the
Bitterroot Valley and I-90 corridor east of Missoula by Saturday
afternoon, and even more widespread on Sunday.

Due to elevated cloud bases, convective development will likely
produce gusty outflow winds, particularly this afternoon/evening
and Sunday. In fact, today there remains a 20% probability for
isolated wind gusts exceeding 50 mph from Georgetown Lake through
Deer Lodge, southward to Butte, as well as across Lemhi County.
The majority of the wind gusts are expected to remain in the range
of 30 to 40 mph. Something to watch out for on Saturday afternoon
will be a strong push of southerly outflow winds through the
Bitterroot Valley, well away from any thunderstorms.

The overall risk of flash flooding remains low over recent burn
scars and flood-prone terrain due to sufficient steering flow for
today through Sunday. However, isolated runoff issues cannot be
entirely ruled out.

By the middle of next week, ensemble guidance continues to indicate an
increase in atmospheric moisture associated with anonymously high
Pacific moisture. Simultaneously, a large-scale trough is
forecast to move onshore over the Pacific Northwest, enhancing
wind shear and destabilizing the environment. Precipitable water
values are projected to range from 150-170 percent of
climatological normals, increasing the potential for more
efficient rainfall production. Under these conditions, the threat
for runoff, debris flows, and localized flash flooding over steep
terrain and burn scars will increase. Additional hazards could
include frequent lightning, small hail, and strong wind gusts.

Individuals with outdoor plans today through next week should
stay weather-aware and be prepared to modify activities in
response to increasing thunderstorm potential across western
Montana and north-central Idaho.


&&

.AVIATION...VFR conditions will prevail again today under southwesterly flow
aloft. Expect typical afternoon gusts in the 20-25 kt range due
to daytime mixing.

By mid-afternoon, scattered showers and thunderstorms will develop across
Lemhi County and southwest Montana, including terminals KSMN and KBTM.
Activity is expected to persist through around sunset. Seasonally warm
temperatures and elevated cloud bases will favor strong convective
downdrafts, with isolated outflow wind gusts exceeding 50 mph possible (20%
chance) in association with the more robust storms.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&

$$
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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