| < September >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Number of Wet Days (probability of rain on a day)
|Average Sunlight per day
|Average Daylight per day
|Sunny (Cloudy) Daylight Hours
|Sun altitude at solar noon on the 21st day.
- 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.
Check the distance to and compare the Great Falls, Montana September averages with somewhere beginning with:
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Weather Trend Graph for September in Great Falls, Montana, Usa
Navigate to September Weather in Locations Surrounding Great Falls, Montana:
- Big Trout Lake, On, Canada - 332.1 kms (206.4 miles) NNW
- Lethbridge (Cda), Ab, Canada - 267.5 kms (166.2 miles) NNW
- Libby, Mt, Usa - 327.9 kms (203.7 miles) WNW
- Kalispell, Montana, Usa - 234.5 kms (145.7 miles) WNW
- Augusta, Mt, Usa - 71.9 kms (44.7 miles) SW
- Missoula, Mt, Usa - 214.7 kms (133.4 miles) WSW
- Helena, Mt, Usa - 109.3 kms (67.9 miles) SSW
- Dillon, Mt, Usa - 303.3 kms (188.5 miles) SSW
- Medicine Hat, Ab, Canada - 285.9 kms (177.7 miles) N
- Sachs Harbour, Nt, Canada - 215.2 kms (133.7 miles) NNE
- Manyberries, Alberta, Canada - 193.4 kms (120.2 miles) NNE
- Billings/ Logan, Mt, Usa - 286 kms (177.7 miles) SE
- Red Lodge, Mt, Usa - 302.9 kms (188.2 miles) SSE
- Livingston, Mt, Usa - 277.6 kms (172.5 miles) S
- Yellowstone Park, Wyoming, Usa - 284.5 kms (176.8 miles) S