September weather forecastDeer Lodge, MT
September
Weather in September
With the onset of September, Deer Lodge bids the scorching summer goodbye and gradually transitions into autumn. While summer temperatures are still palpable, September introduces a coolness to the air, especially during nights. Nonetheless, sunlight maintains its prominent presence with relatively long exposure hours. Rainfall does not deviate much from the summer average, ensuring a smooth transition to autumn. The increasing wind speeds, commensurate with the impending colder months, gradually sets the stage for changes in the weather.Temperature
A shift in the average high-temperature occurs in September, reducing from a moderately hot 75.7°F (24.3°C) in August to a comfortable 65.5°F (18.6°C). Deer Lodge sees a large disparity in day to night temperatures in September, with the night temperature dropping to an average of 41.2°F (5.1°C).Humidity
In Deer Lodge, the average relative humidity in September is 55%.Rainfall
In Deer Lodge, in September, during 9.7 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, there are 151.7 rainfall days, and 16.46" (418mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1.2 snowfall days, it receives 1.73" (44mm) of snow. In Deer Lodge, during the entire year, snow falls for 105 days and aggregates up to 49.69" (1262mm) of snow.Daylight
The average length of the day in September in Deer Lodge 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
In September, the average sunshine in Deer Lodge is 9.7h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 3 during September leads to these advisories:
Take necessary precautions - Suggestions to elude sunburn are provided. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 30min
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 42min
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).
