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 arrival corresponds with a decrease in average high-temperatures, from August's warm 75.7°F (24.3°C) to a comfortable 65.5°F (18.6°C). The anticipated average low-temperature for September, a wintry 41.2°F (5.1°C), shows a substantial deviation from the daytime maximums.Humidity
The average relative humidity in September is 55%.Rainfall
In September, the rain falls for 9.7 days. Throughout September, 1.14" (29mm) of precipitation is accumulated. In Deer Lodge, during the entire year, the rain falls for 151.7 days and collects up to 16.46" (418mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 1.2 snowfall days, it receives 1.73" (44mm) of snow. Throughout the year, there are 105 snowfall days, and 49.69" (1262mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 32min.On the first day of September, sunrise is at 6:52 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 7:12 pm MDT.
Sunshine
The average sunshine in September is 9.7h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. To protect against the Sun's most potent rays, avoid direct exposure around midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Deer Lodge, 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 (25.5°F).
- Average low temperature in September: 41.2°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (11.7°F).
Average pressure in September
Deer Lodge, MT
- Average pressure in September: 29.98"Hg
The months with the highest atmospheric pressure are January and December (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Deer Lodge, MT
- Average wind speed in September: 5.6mph
The windiest months (with the highest average wind speed) are January and April (6.6mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Deer Lodge, MT
- Average humidity in September: 55%
The months with the highest relative humidity are January and February (88%).
The months with the lowest relative humidity are July and August (49%).
Average rainfall in September
Deer Lodge, MT
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in September
Deer Lodge, MT
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is May (19.9 days).
The month with the least rainy days is December (8.8 days).
Average snowfall in September
Deer Lodge, MT
- Average snowfall in September: 1.73"
The month with the highest snowfall is February (8.78").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Deer Lodge, MT
- Average snowfall days in September: 1.2 days
The month with the highest number of snowfall days is February (19.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Deer Lodge, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in September
Deer Lodge, MT
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is September (16.1 days).
The month with the least sunshine days is February (6.7 days).
Average UV index in September
Deer Lodge, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Deer Lodge, MT
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Deer Lodge, MT
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Deer Lodge, Montana, USA
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