United StatesThe weather in September in Great Falls
It's pleasantly warm in September in Great Falls with an average temperature of 22°C. Temperatures this month range from a low of 17°C to a high of 28°C. At night, you can expect temperatures between 5°C and 11°C.
Looking for great weather? September is a good time to be in Great Falls. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Great Falls, Montana. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 39°C in 2022, Great Falls reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was -2°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of -7°C to a highest value of 19°C.
Precipitation and snowfall
In September, there is an average of 67 mm of precipitation, spread over 9 days. Of the total precipitation, about 1,6 cm falls as snow in September. The wind speed is around 4 Bft, mostly coming from the Southwest.
Daily weather in September for Great Falls
Click on any day in September to get detailed info about the usual weather on that day in Great Falls. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Great Falls | New York | |
|---|---|---|
| Average temperature | 22°C | 27°C |
| Max. temperature | 28°C | 31°C |
| Min. temperature | 5°C | -5°C |
| Total precipitation | 67 mm | 57 mm |
| Rainy days | 9 days | 9 days |
| Total snowfall | 1,6 cm | 0 cm |
| Snowy days | 1 day | 0 days |
Start of September
The month of September starts in Great Falls with warm temps, averaging around 26°C during the day and nights around 10°C.
Mid September
By mid-September, daytime temps drop to around 21°C, with nights around 8°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Great Falls is around 21°C, while nighttime temps are about 7°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Check out the climate of Great Falls for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Great Falls, Montana. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Great Falls
Temperature in September in Great Falls over the years
Precipitation charts
These charts show the average amount of precipitation in September in Great Falls, Montana. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Great Falls
Total precipitation in September in Great Falls over the years
Daily Snowfall in September in Great Falls
Snowfall in September in Great Falls per year
Daily UV index in September in Great Falls
This chart shows the average daily UV index in September in Great Falls, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Great Falls
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Average weather in Great Falls by month
Click on a month below to see detailed weather info for Great Falls. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.