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 arrival of September signals a shift in temperature, down from a warm 76.5°F (24.7°C) in August to a comfortable 65.5°F (18.6°C). Seeley Lake, after hot September days, encounters a marked drop to an average nighttime temperature of 38.3°F (3.5°C).Humidity
In Seeley Lake, the average relative humidity in September is 61%.Rainfall
In Seeley Lake, during September, the rain falls for 9.2 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, there are 135.1 rainfall days, and 17.6" (447mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 0.24" (6mm) of snow. In Seeley Lake, during the entire year, snow falls for 119.6 days and aggregates up to 67.99" (1727mm) of snow.Daylight
In Seeley Lake, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:54 am and sunset at 8:13 pm. On the last day of September, sunrise is at 7:32 am and sunset at 7:14 pm MDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Seeley Lake have in September?
How high is the UV index in September?
Average temperature in September
Seeley Lake, MT
- Average high temperature in September: 65.5°F
The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is December (25.7°F).
- Average low temperature in September: 38.3°F
The month with the highest average low temperature is August (44.2°F).
The coldest month (with the lowest average low temperature) is December (12°F).
Average pressure in September
Seeley Lake, MT
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Seeley Lake, MT
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is April (5.2mph).
The calmest months (with the lowest average wind speed) are August and December (4.3mph).
Average humidity in September
Seeley Lake, MT
- Average humidity in September: 61%
The month with the highest relative humidity is January (92%).
The months with the lowest relative humidity are July and August (53%).
Average rainfall in September
Seeley Lake, MT
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is April (2.05").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in September
Seeley Lake, MT
- Average rainfall days in September: 9.2 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is August (6 days).
Average snowfall in September
Seeley Lake, MT
- Average snowfall in September: 0.24"
The month with the highest snowfall is January (14.17").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Seeley Lake, MT
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is January (21.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Seeley Lake, 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 36min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Seeley Lake, MT
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is August (21.2 days).
The month with the least sunshine days is February (6 days).
Average UV index in September
Seeley Lake, MT
- Average UV index in September: 3
The month with the highest UV index is 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
Seeley Lake, MT
- Average cloud cover in September: 23
The months with the most cloud cover are January and February (Cloud cover 57).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in September
Seeley Lake, 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).
Seeley Lake, Montana, USA
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