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
September's onset brings a reduction in the average high-temperature, from a moderately hot 81.1°F (27.3°C) in August to an agreeable 70.3°F (21.3°C). Box Elder, during the nights of September, experiences an average temperature drop to a cool 52.2°F (11.2°C).Humidity
In September, the average relative humidity is 47%.Rainfall
In Box Elder, during September, the rain falls for 8.5 days and regularly aggregates up to 0.94" (24mm) of precipitation. Throughout the year, there are 103.8 rainfall days, and 11.26" (286mm) of precipitation is accumulated.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 0.63" (16mm) of snow. In Box Elder, during the entire year, snow falls for 55.7 days and aggregates up to 22.09" (561mm) of snow.Daylight
In September, the average length of the day is 12h and 34min.On the first day of September, sunrise is at 6:38 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:00 pm MDT.
Sunshine
In Box Elder, the average sunshine in September is 10h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Guard yourself - Precautionary measures against sun damage are advocated. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
How many hours of daylight does Box Elder have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Box Elder, MT
- Average high temperature in September: 70.3°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (27.5°F).
- Average low temperature in September: 52.2°F
The month with the highest average low temperature is August (60.4°F).
The coldest month (with the lowest average low temperature) is February (14°F).
Average pressure in September
Box Elder, MT
- Average pressure in September: 29.93"Hg
The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Box Elder, MT
- Average wind speed in September: 8.9mph
The windiest month (with the highest average wind speed) is November (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.4mph).
Average humidity in September
Box Elder, MT
- Average humidity in September: 47%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Box Elder, MT
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is June (2.13").
The driest month (with the least rainfall) is December (0.43").
Average rainfall days in September
Box Elder, MT
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is February (3.7 days).
Average snowfall in September
Box Elder, MT
- Average snowfall in September: 0.63"
The month with the highest snowfall is January (3.9").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Box Elder, MT
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Box Elder, MT
- Average daylight in September: 12h and 4min
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: 10h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).
Average sunshine days in September
Box Elder, MT
- Average sunshine days in September: 19.1 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is April (12.2 days).
Average UV index in September
Box Elder, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Box Elder, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in September
Box Elder, MT
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Box Elder, Montana, USA
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