Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The commencement of September indicates a shift in the average high-temperature, receding from August's warm 78.6°F (25.9°C) to a comfortable 67.6°F (19.8°C). September nights in Polson present a stark temperature decrease to a wintry 42.3°F (5.7°C).Humidity
In Polson, the average relative humidity in September is 59%.Rainfall
In Polson, during September, the rain falls for 10.7 days and regularly aggregates up to 0.94" (24mm) of precipitation. In Polson, during the entire year, the rain falls for 160.2 days and collects up to 18.11" (460mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Polson. September is the first month it typically snows in Polson. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Polson, during the entire year, snow falls for 99 days and aggregates up to 47.28" (1201mm) of snow.Daylight
In September, the average length of the day is 12h and 33min.On the first day of the month, sunrise is at 6:56 am and sunset at 8:16 pm. On the last day of September, in Polson, Montana, sunrise is at 7:35 am and sunset at 7:17 pm MDT.
Sunshine
In Polson, the average sunshine in September is 9.4h.UV index
In Polson, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Exercise prevention - Precautions against solar damage are endorsed. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Polson?
What is the average humidity in September in Polson?
How much does it rain in Polson in September?
When does it start to snow in Polson?
How many hours of daylight does Polson have in September?
When is the sunrise / sunset in September in Polson?
How long on average sun shines in September in Polson?
What is the UV index intensity in September in Polson?
Average temperature in September
Polson, MT
- Average high temperature in September: 67.6°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is December (27.9°F).
- Average low temperature in September: 42.3°F
The months with the highest average low temperature are July and August (48.9°F).
The coldest month (with the lowest average low temperature) is December (16.7°F).
Average pressure in September
Polson, MT
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Polson, MT
- Average wind speed in September: 3.9mph
The windiest month (with the highest average wind speed) is April (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
Polson, MT
- Average humidity in September: 59%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (51%).
Average rainfall in September
Polson, MT
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is June (2.2").
The driest months (with the least rainfall) are July and August (0.55").
Average rainfall days in September
Polson, MT
- Average rainfall days in September: 10.7 days
The months with the highest number of rainy days are March and April (18.8 days).
The month with the least rainy days is August (7 days).
Average snowfall in September
Polson, MT
- Average snowfall in September: 0.31"
The month with the highest snowfall is February (10.28").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Polson, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (19.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Polson, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Polson, MT
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is July (21.3 days).
The month with the least sunshine days is March (6.4 days).
Average UV index in September
Polson, MT
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Polson, MT
- Average cloud cover in September: 22
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility in September
Polson, MT
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Polson, Montana, USA
Weather forecast for your location
2. Allow the app to use your location