Hourly Weather Forecast for Great Falls, Montana

Hourly Weather | Today › Tuesday, April 7, 2026

Active Weather Warnings

High Wind Warning
High Wind Watch

Great Falls, Montana

10 AM

59°

Feels Like 55°

Humidity: 33%

UV Index: 3

Wind: 21 mph

11 AM

61°

Feels Like 57°

Humidity: 30%

UV Index: 4

Wind: 25 mph

12 PM

63°

Feels Like 59°

Humidity: 27%

UV Index: 5

Wind: 28 mph

1 PM

64°

Feels Like 61°

Humidity: 25%

UV Index: 5

Wind: 30 mph

2 PM

66°

Feels Like 64°

Humidity: 22%

UV Index: 5

Wind: 31 mph

3 PM

63°

Feels Like 59°

Humidity: 23%

UV Index: 4

Wind: 31 mph

4 PM

59°

Feels Like 52°

Humidity: 26%

UV Index: 1

Wind: 30 mph

5 PM

55°

Feels Like 46°

Humidity: 31%

UV Index: 2

Wind: 28 mph

6 PM

50°

Feels Like 39°

Humidity: 39%

UV Index: 1

Wind: 24 mph

7 PM

46°

Feels Like 36°

Humidity: 43%

UV Index: 0

Wind: 21 mph

8 PM

43°

Feels Like 30°

Humidity: 47%

UV Index: 0

Wind: 21 mph

9 PM

39°

Feels Like 27°

Humidity: 52%

UV Index: 0

Wind: 17 mph

10 PM

37°

Feels Like 25°

Humidity: 57%

UV Index: 0

Wind: 17 mph

11 PM

34°

Feels Like 19°

Humidity: 64%

UV Index: 0

Wind: 16 mph

Hourly Air Quality Forecast - AQI (US EPA)

10 AM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.93 µg/m³
PM₁₀: 1.16 µg/m³
O₃: 0.044 ppm
NO₂: 0.6 ppb
SO₂: 0 ppb
CO: 0.11 ppm

Health Recommendations:

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

11 AM

43 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.9 µg/m³
PM₁₀: 1.09 µg/m³
O₃: 0.047 ppm
NO₂: 0.4 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

12 PM

45 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.86 µg/m³
PM₁₀: 1.02 µg/m³
O₃: 0.049 ppm
NO₂: 0.2 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

1 PM

46 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.78 µg/m³
PM₁₀: 0.9 µg/m³
O₃: 0.049 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

2 PM

44 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.7 µg/m³
PM₁₀: 0.79 µg/m³
O₃: 0.048 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

3 PM

43 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.68 µg/m³
PM₁₀: 0.77 µg/m³
O₃: 0.047 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

4 PM

43 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.7 µg/m³
PM₁₀: 0.79 µg/m³
O₃: 0.047 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

5 PM

45 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.78 µg/m³
PM₁₀: 0.88 µg/m³
O₃: 0.048 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

6 PM

46 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.84 µg/m³
PM₁₀: 0.96 µg/m³
O₃: 0.050 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

7 PM

47 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 0.89 µg/m³
PM₁₀: 1.02 µg/m³
O₃: 0.051 ppm
NO₂: 0.1 ppb
SO₂: 0 ppb
CO: 0.09 ppm

Health Recommendations:

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

8 PM

48 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1 µg/m³
PM₁₀: 1.17 µg/m³
O₃: 0.052 ppm
NO₂: 0.2 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

9 PM

49 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.13 µg/m³
PM₁₀: 1.35 µg/m³
O₃: 0.053 ppm
NO₂: 0.2 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

10 PM

49 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.22 µg/m³
PM₁₀: 1.47 µg/m³
O₃: 0.053 ppm
NO₂: 0.2 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

11 PM

49 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 1.3 µg/m³
PM₁₀: 1.59 µg/m³
O₃: 0.053 ppm
NO₂: 0.3 ppb
SO₂: 0 ppb
CO: 0.10 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Great Falls

Severe Future Possible

High Wind Watch

High Wind Watch issued April 5 at 11:58AM MDT until April 7 at 9:00PM MDT by NWS Great Falls MT

Apr 7, 9:00 AM → Apr 7, 9:00 PM

WHAT: West winds 30 to 40 mph with gusts up to 75 mph possible.
The strongest winds will occur along and west of the Interstate 15
corridor and south of the Montana Hwy 200 corridor.

WHERE: Cascade County, including the Little Belt and Highwood
Mountains, Eastern Toole and Liberty Counties, Eastern Pondera and
Eastern Teton Counties, Western and Central Chouteau County,
Judith Basin County and Judith Gap, Upper Blackfoot and MacDonald
Pass, and Big Belt, Bridger and Castle Mountains.

WHEN: From Tuesday morning through Tuesday evening.

IMPACTS: Damaging winds may blow down trees and power lines.
Power outages are possible. Travel could be very difficult,
especially for high profile vehicles. Blowing dust could reduce
visibility at times.

ADDITIONAL DETAILS: Blowing dust may significantly reduce
visibility at times, especially along Interstate 15 between Shelby
and the Canadian border.

+ Read More

Monitor the latest forecasts and warnings for updates.

Updated: Apr 5, 10:21 PM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Great Falls

High Wind Watch

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