September weather forecastColumbia Falls, MT
September
Weather in September
September weather in Columbia Falls, Montana, experiences a noticeable shift from hot summer temperatures to a cooler fall-like weather. There's an appreciable cool-down from the high August temperature of 76.8°F (24.9°C), signaling the onset of Autumn. The shorter days and an increase in rainfall contribute to the changing atmosphere of Columbia Falls. As October approaches, expect a further drop in temperature and daylight hours along with an increase in cloud cover. Even so, September's pleasant weather conditions make it an appealing time for individuals who prefer a balance between summer warmth and autumn cool.Temperature
Columbia Falls's transition into September involves a shift in temperature, receding from a warm 76.8°F (24.9°C) in August to an enjoyable 65.5°F (18.6°C). Columbia Falls experiences a significant contrast between daily highs and an average nighttime temperature of 39.2°F (4°C) during September.Humidity
The average relative humidity in September is 64%.Rainfall
In Columbia Falls, in September, during 8.5 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. In Columbia Falls, during the entire year, the rain falls for 126.4 days and collects up to 11.22" (285mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.04" (1mm) of snow. In Columbia Falls, during the entire year, snow falls for 97 days and aggregates up to 33.86" (860mm) of snow.Daylight
In Columbia Falls, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:55 am and sunset at 8:17 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:17 pm MDT.
Sunshine
In Columbia Falls, the average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in Columbia Falls is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Columbia Falls, MT
- Average high temperature in September: 65.5°F
The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is December (25.7°F).
- Average low temperature in September: 39.2°F
The month with the highest average low temperature is August (45.5°F).
The coldest month (with the lowest average low temperature) is February (13.5°F).
Average pressure in September
Columbia Falls, MT
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Columbia Falls, MT
- Average wind speed in September: 3.8mph
The windiest month (with the highest average wind speed) is April (4.6mph).
The calmest months (with the lowest average wind speed) are August and December (3.7mph).
Average humidity in September
Columbia Falls, MT
- Average humidity in September: 64%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
Columbia Falls, MT
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is June (1.42").
The driest month (with the least rainfall) is August (0.43").
Average rainfall days in September
Columbia Falls, MT
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is August (6.3 days).
Average snowfall in September
Columbia Falls, MT
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (7.72").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Columbia Falls, MT
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (19.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Columbia Falls, MT
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 24min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Columbia Falls, MT
- Average sunshine days in September: 19 days
The month with the most sunshine days is July (21.5 days).
The month with the least sunshine days is March (7.7 days).
Average UV index in September
Columbia Falls, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Columbia Falls, MT
- Average cloud cover in September: 24
The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in September
Columbia Falls, MT
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
