Today | Weather | Sunday, July 26, 2026
Active Weather Warnings

Weather in Great Falls, Montana

06:55 AM
Now
Cloudy Weather
63° F
Feels Like 64°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 52 %
Today
Sunny Weather
Day 97°
Night 59°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Great Falls Weather Forecast Updated

47 minutes ago
Last updated on

Air Quality in Great Falls

NOW
23 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 5.49 µg/m³
PM10 5.71 µg/m³
O3 0.022 ppm
NO2 2.4 ppb
SO2 0 ppb
CO 0.08 ppm
NH3 6.8 µg/m³
NO 0.02 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

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

Show raw pollutant concentrations (µg/m³)
PM2.55.49 µg/m³
PM105.71 µg/m³
O343.61 µg/m³
NO24.59 µg/m³
SO20.04 µg/m³
CO97.17 µg/m³
NH36.8 µg/m³
NO0.02 µg/m³

Weather Alerts and Warnings for Great Falls

Severe Future Likely

Extreme Heat Watch

Extreme Heat Watch issued July 22 at 11:53PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Jul 24, 10:00 AM Jul 26, 9:00 PM
WHAT: Dangerously hot conditions with afternoon temperatures 95 to
105 degrees possible.

WHERE: Cascade County below 5000ft, Judith Basin County and Judith
Gap, and Western and Central Chouteau County.

WHEN: From Friday morning through Sunday evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.

ADDITIONAL DETAILS: The most intense heat is expected Friday and
Saturday.
+ Read More
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Updated: Jul 23, 12:43 PM Source: NWS Alert
Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued July 24 at 1:31PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Jul 24, 1:31 PM Jul 26, 9:00 PM
WHAT: Dangerously hot conditions. High temperatures between 100
and 107 degrees expected, with overnight temperatures only dropping
to the mid to upper 60s.

WHERE: Bears Paw Mountains and Southern Blaine, Cascade County
below 5000ft, Fergus County below 4500ft, Hill County, Judith Basin
County and Judith Gap, Northern Blaine County, and Western and
Central Chouteau County.

WHEN: Until 9 PM MDT Sunday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat.

ADDITIONAL DETAILS: Heat will peak during the day on Saturday,
with afternoon and evening high temperatures peaking between 100
and 107 degrees.
+ Read More
Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. If you must spend time outdoors, wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Updated: Jul 24, 10:24 PM Source: NWS Alert
Moderate Expected Likely

Heat Advisory

Heat Advisory issued July 25 at 10:40PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Jul 25, 10:40 PM Jul 26, 9:00 PM
WHAT: Hot Conditions. High temperatures of between 95 and 100
degrees.

WHERE: Cascade County below 5000ft, Hill County, Judith Basin
County and Judith Gap, Northern Blaine County, and Western and
Central Chouteau County.

WHEN: Until 9 PM MDT Sunday.

IMPACTS: Hot temperatures may cause heat illnesses.
+ Read More
Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. If you must spend time outdoors, wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Updated: Jul 26, 6:07 AM Source: NWS Alert