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 onset of September coincides with a reduction in the average high-temperature, falling from a warm 77.5°F (25.3°C) in August to an enjoyable 67.5°F (19.7°C). During September, the nighttime temperature in Jefferson City presents a clear descent from the daily peaks, falling to an average of 42.4°F (5.8°C).Humidity
In September, the average relative humidity in Jefferson City, Montana, is 52%.Rainfall
In Jefferson City, in September, during 9.8 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. In Jefferson City, Montana, during the entire year, the rain falls for 133.7 days and collects up to 16.38" (416mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows in Jefferson City, Montana. Throughout September, in the average 1.2 snowfall days, it receives 2.01" (51mm) of snow. Throughout the year, in Jefferson City, there are 105.8 snowfall days, and 55.12" (1400mm) of snow is accumulated.Daylight
The average length of the day in September in Jefferson City, Montana, is 12h and 32min.On the first day of the month, sunrise is at 6:49 am and sunset at 8:06 pm. On the last day of September, in Jefferson City, sunrise is at 7:26 am and sunset at 7:09 pm MDT.
Sunshine
The average sunshine in September is 9.8h.UV index
In Jefferson City, Montana, 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 unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Frequently asked questions
What is the usual temperature for Jefferson City in September?
What is the average humidity in September in Jefferson City?
How much does it rain in Jefferson City in September?
When does it start to snow in Jefferson City?
What is the average length of the day in September in Jefferson City?
When are sunrise and sunset in September in Jefferson City?
How long on average sun shines in September in Jefferson City?
How high is the UV index in September in Jefferson City?
Average temperature in September
Jefferson City, MT
- Average high temperature in September: 67.5°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (27°F).
- Average low temperature in September: 42.4°F
The month with the highest average low temperature is August (48.6°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).
Average pressure in September
Jefferson City, MT
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Jefferson City, MT
- Average wind speed in September: 5.4mph
The windiest months (with the highest average wind speed) are January and November (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Jefferson City, MT
- Average humidity in September: 52%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (46%).
Average rainfall in September
Jefferson City, MT
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is June (2.68").
The driest month (with the least rainfall) is December (0.79").
Average rainfall days in September
Jefferson City, MT
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in September
Jefferson City, MT
- Average snowfall in September: 2.01"
The month with the highest snowfall is February (9.72").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Jefferson City, MT
- Average snowfall days in September: 1.2 days
The month with the highest number of snowfall days is February (18 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Jefferson City, 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 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in September
Jefferson City, MT
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is February (8.5 days).
Average UV index in September
Jefferson City, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Jefferson City, MT
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Jefferson City, MT
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Jefferson City, Montana, USA
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