Today | Weather | Monday, October 12, 2026

Active Weather Warnings

Dense Fog Advisory

Weather in Great Falls, Montana

07:07 PM

Now

34° F

Feels Like 34°

Precipitation 0 %

Wind 5 mph

Humidity 77 %

Today

Day 36°

Night 27°

Precipitation 5 %

Wind 5 mph

UV Index (0 - 11+) 2

FROST FORECAST

Overnight Frost 12 AM – 9 AM

Tomorrow Morning Frost 12 AM – 8 AM

Great Falls Weather Forecast Updated

Last updated on October 12, 2026 at 5:49 PM

Weather Forecast History

Last Year's Weather on This Day (October 12, 2025)

Day

37°

Night

25°

Wind

9 mph

UV Index

Precipitation

100 %

Air Quality in Great Falls

NOW

21 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 1.58 µg/m³

PM₁₀ 1.81 µg/m³

O₃ 0.022 ppm

NO₂ 3.7 ppb

SO₂ 0 ppb

CO 0.14 ppm

NH₃ 1 µg/m³

NO 0.13 µg/m³

PM_2.5 – 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)

PM_2.5 – 1.58 µg/m³

PM₁₀ – 1.81 µg/m³

O₃ – 43.81 µg/m³

NO₂ – 7.04 µg/m³

SO₂ – 0.03 µg/m³

CO – 156.34 µg/m³

NH₃ – 1 µg/m³

NO – 0.13 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Great Falls

Moderate Expected Likely

Dense Fog Advisory

Dense Fog Advisory issued October 12 at 12:25PM MDT until October 13 at 12:00PM MDT by NWS Great Falls MT

Oct 12, 9:00 PM → Oct 13, 12:00 PM

WHAT: Visibility as low as one quarter of a mile in dense fog.

WHERE: Portions of central, north central, and southwest Montana.

WHEN: From 9 PM this evening to noon MDT Tuesday.

IMPACTS: Low visibility could make driving conditions hazardous.

ADDITIONAL DETAILS: Below freezing temperatures may lead to a
glaze of ice on surfaces, most notably on bridges and overpasses.

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If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Updated: Oct 12, 5:49 PM Source: NWS Alert