Great Falls (MT) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Great Falls.
Climate overview of Great Falls
Great Falls, Montana, United States of America, sees big temperature differences between seasons, with July peaking at 30°C (86°F) and December dropping to 2°C (36°F).
The city has a relatively dry climate, receiving around 387 mm (15 in) of rain/snowfall per year. It does experience a distinct dry season from July to March. May is the wettest month and March the driest. Sunshine peaks in July, when the city sees around 12.5 hours of sunshine per day.
Great Falls Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Great Falls — and find the best time to visit.
Monthly Temperature in Great Falls
Visitors to Great Falls can expect significant temperature changes throughout the year. On average, daytime temperatures range from a comfortable 30°C (86°F) in July to a very cold 2°C (36°F) in December.
Nighttime temperatures range from 12°C (54°F) in July to -9°C (16°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Great Falls
Great Falls's climate is marked by below-average rain/snowfall, accumulating 387 mm (15 in) of precipitation yearly. The seasons in Great Falls bring significant changes in precipitation. The wettest month, May, receives moderate rainfall, with an average of 67 mm (2.6 in) of precipitation. This rainfall is distributed across 12 rainy days.
In contrast, the driest month, March, experiences much less snow/rainfall, totaling 15 mm (0.6 in) over 7 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Great Falls Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Great Falls
In Great Falls, summer days are longer and more sunny, with daily sunshine hours peaking at 12.5 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 3.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Great Falls by Month
The relative humidity is moderate throughout the year in Great Falls.
The city experiences its highest humidity in January, reaching 63%. In July, the humidity drops to its lowest level at 37%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Great Falls
The mean wind speed varies between 3 m/s (6 knots) and 5 m/s (10 knots) throughout the year. It is lowest in July and highest during January, February, March, April, October, November and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Great Falls
The weather does bring rainfall during this period, between 29 mm (1.1 in) and 58 mm (2.3 in). Need help choosing your next travel destination? We offer a specialized tool that matches you with locations based on your weather preferences. Explore destinations that suit your climate preferences.
Frequently asked questions about the climate in Great Falls
What is the best time to visit Great Falls?
June, August and September typically offer the most optimal weather in Great Falls. In contrast, January, February and December tend to have less optimal conditions. Great Falls has a distinct dry season from July to March.
What temperatures can I expect in Great Falls?
Daytime highs range from 2°C (36°F) in December to 30°C (86°F) in July. Nighttime lows range from -9°C (16°F) to 12°C (54°F). Temperatures vary considerably through the year.
How much rain does Great Falls get?
Annual rainfall is around 387 mm (15 in). May is the wettest month with 67 mm (2.6 in), while March is the driest with 15 mm (0.6 in).
How sunny is Great Falls?
Great Falls receives around 2,770 hours of sunshine per year. July is the sunniest month with 376 hours, while December is the cloudiest with just 108 hours. Overall, Great Falls enjoys abundant sunshine.
Great Falls 3-Day Forecast
Great Falls (MT) 3-Day Forecast
Great Falls on the map
Great Falls is highlighted — select any city to see its climate.
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