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Weather in September in Great Falls, Montana

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< September >
 
Normal Max/ High Temperature 21°C (70°F)
 
Average Temperature 14°C (57°F)
 
Min/ Low Temperature 6°C (44°F)
 
Normal Precipitation 32mm (1.2in)
Number of Wet Days (probability of rain on a day) 7 (23%)
Average Sunlight per day 08:48
Average Daylight per day 12:30
Sunny (Cloudy) Daylight Hours 71% (29%)
Sun altitude at solar noon on the 21st day.
43°


  • The average temperature in Great Falls, Montana in September is mild at 13.7 °C (56.66 °F).
  • Afternoons can be warm with average high temperatures reaching 20.9 °C (69.6 °F).
  • Overnight temperatures are generally cool with an average low of 6.4 °C (43.5 °F).
  • The range/ variation of daily mean temperatures in September is 14.5 °C (26.1 °F).
  • The weather in September is dry with sporadic rain. A mere 31.5mm (1.2in) of liquid falls during an average of 7 days.
  • In September the skies in Great Falls, Montana are quite sunny with on balance a sizable 8:48 of dazzling solar radiation daily.
  • The shortest day is 11:39 long and the longest day is 13:20 long with an average length of 12:30.
  • There are approximately 3:30 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 71.5% of daylight hours and cloudy 28.5% of daylight hours.

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Weather Trend Graph for September in Great Falls, Montana, Usa

Graph of weather in Great Falls, Montana in September

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