September weather forecast
Jefferson City, MT

Weather in September

The first month of the autumn, September, is also an enjoyable month in Jefferson City, Montana, with temperature in the range of an average low of 42.4°F (5.8°C) and an average high of 67.5°F (19.7°C).

Temperature

In September, the average high-temperature drops from a moderately hot 77.5°F (25.3°C) in August to an enjoyable 67.5°F (19.7°C). In Jefferson City, the average low-temperature is 42.4°F (5.8°C).

Humidity

In September, the average relative humidity in Jefferson City is 52%.

Rainfall

In Jefferson City, it is raining for 9.8 days, with typically 1.14" (29mm) of accumulated precipitation. In Jefferson City, during the entire year, the rain falls for 133.7 days and collects up to 16.38" (416mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall in Jefferson City. September is the first month it typically snows. Throughout September, in the average 1.2 snowfall days, it receives 2.01" (51mm) of snow. Throughout the year, there are 105.8 snowfall days, and 55.12" (1400mm) of snow is accumulated.

Daylight

In September, the average length of the day in Jefferson City is 12h and 32min.
On the first day of September, sunrise is at 6:48 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:10 pm MDT.

Sunshine

In September, the average sunshine is 9.8h.

UV index

In September, the average daily maximum UV index in Jefferson City, Montana, is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
[Resources]

FAQ

What is the average humidity in September in Jefferson City?

In September, the average relative humidity in Jefferson City is 52%.

How much does it rain in Jefferson City in September?

In Jefferson City, in September, it is raining for 9.8 days, with typically 1.14" (29mm) of accumulated precipitation.

When does it start snowing in Jefferson City?

September is the first month it typically snows in Jefferson City. Throughout September, in the average 1.2 snowfall days, it receives 2.01" (51mm) of snow.

What is the average length of the day in September in Jefferson City?

In September, the average day length in Jefferson City, Montana, is 12h and 32min.

When is the sunrise / sunset in September in Jefferson City?

On the first day of September, sunrise is at 6:48 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:10 pm MDT.

How long on average sun shines in September in Jefferson City?

In September, the average sunshine duration in Jefferson City is 9.8h.

What is the UV index intensity in September in Jefferson City?

In September, the average daily maximum UV index in Jefferson City is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Jefferson City, MT

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).

[Resources]

Average pressure in September
Jefferson City, MT

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).

[Resources]

Average wind speed in September
Jefferson City, MT

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).

[Resources]

Average humidity in September
Jefferson City, MT

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%).

[Resources]

Average rainfall in September
Jefferson City, MT

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").

[Resources]

Average rainfall days in September
Jefferson City, MT

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).

[Resources]

Average snowfall in September
Jefferson City, MT

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").

[Resources]

Average snowfall days in September
Jefferson City, MT

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).

[Resources]

Average daylight in September /
Average sunshine in September
Jefferson City, MT

Average daylight in September / Average sunshine in September - Jefferson City, MT
  • Average daylight in September: 12h and 32min

The month with the longest days is June (Average daylight: 15h and 45min).
The month with the shortest days is December (Average daylight: 8h and 40min).

  • Average sunshine in September: 9h and 48min

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).

[Resources]

Average sunshine days in September
Jefferson City, MT

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).

[Resources]

Average UV index in September
Jefferson City, MT

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).

[Resources]

Average cloud cover in September
Jefferson City, MT

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).

[Resources]

Average visibility in September
Jefferson City, MT

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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location