September weather forecast
Big Timber, MT

Weather in September

September, the first month of the autumn in Big Timber, is still a comfortable month, with temperature in the range of an average low of 45.3°F (7.4°C) and an average high of 66.7°F (19.3°C).

Temperature

In Big Timber, the average high-temperature in September drops from a warm 76.6°F (24.8°C) in August to an enjoyable 66.7°F (19.3°C). In September, in Big Timber, Montana, the average low-temperature is 45.3°F (7.4°C).

Humidity

In September, the average relative humidity in Big Timber, Montana, is 51%.

Rainfall

In Big Timber, in September, it is raining for 9.8 days, with typically 1.1" (28mm) of accumulated precipitation. In Big Timber, during the entire year, the rain falls for 129.6 days and collects up to 15.83" (402mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows in Big Timber. Throughout September, in the average 1 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, in Big Timber, there are 67.6 snowfall days, and 38.19" (970mm) of snow is accumulated.

Daylight

In Big Timber, the average length of the day in September is 12h and 31min.
On the first day of September, sunrise is at 6:41 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:02 pm MDT.

Sunshine

In September, the average sunshine is 10.2h.

UV index

In Big Timber, Montana, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the average humidity in September in Big Timber?

The average relative humidity in September in Big Timber, Montana, is 51%.

How many days does it rain in September in Big Timber?

In Big Timber, Montana, during September, the rain falls for 9.8 days and regularly aggregates up to 1.1" (28mm) of precipitation.

When does it start to snow in Big Timber?

September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 0.51" (13mm) of snow.

What is the average length of the day in September in Big Timber?

The average day length in September in Big Timber, Montana, is 12h and 31min.

When is the sunrise / sunset in September in Big Timber?

On the first day of September, sunrise is at 6:41 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:02 pm MDT.

How many hours of sunshine does Big Timber have in September?

The average sunshine duration in September is 10.2h.

What is the UV index intensity in September in Big Timber?

In Big Timber, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Big Timber, MT

Average temperature in September - Big Timber, MT
  • Average high temperature in September: 66.7°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is December (28.4°F).

  • Average low temperature in September: 45.3°F

The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).

[Resources]

Average pressure in September
Big Timber, MT

Average pressure in September - Big Timber, MT
  • Average pressure in September: 29.96"Hg

The months with the highest atmospheric pressure are January and December (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

[Resources]

Average wind speed in September
Big Timber, MT

Average wind speed in September - Big Timber, MT
  • Average wind speed in September: 6.9mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).

[Resources]

Average humidity in September
Big Timber, MT

Average humidity in September - Big Timber, MT
  • Average humidity in September: 51%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (47%).

[Resources]

Average rainfall in September
Big Timber, MT

Average rainfall in September - Big Timber, MT
  • Average rainfall in September: 1.1"

The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (0.47").

[Resources]

Average rainfall days in September
Big Timber, MT

Average rainfall days in September - Big Timber, MT
  • Average rainfall days in September: 9.8 days

The month with the highest number of rainy days is May (19.8 days).
The months with the least rainy days are January and December (5.3 days).

[Resources]

Average snowfall in September
Big Timber, MT

Average snowfall in September - Big Timber, MT
  • Average snowfall in September: 0.51"

The month with the highest snowfall is March (7.09").
The months with the least snowfall are June, July and August (0").

[Resources]

Average snowfall days in September
Big Timber, MT

Average snowfall days in September - Big Timber, MT
  • Average snowfall days in September: 1 days

The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Big Timber, MT

Average daylight in September / Average sunshine in September - Big Timber, MT
  • Average daylight in September: 12h and 31min

The month with the longest days is June (Average daylight: 15h and 40min).
The month with the shortest days is December (Average daylight: 8h and 44min).

  • Average sunshine in September: 10h and 12min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 12min).

[Resources]

Average sunshine days in September
Big Timber, MT

Average sunshine days in September - Big Timber, MT
  • Average sunshine days in September: 17.8 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (7.7 days).

[Resources]

Average UV index in September
Big Timber, MT

Average UV index in September - Big Timber, MT
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

[Resources]

Average cloud cover in September
Big Timber, MT

Average cloud cover in September - Big Timber, MT
  • Average cloud cover in September: 21

The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are July and August (Cloud cover 16).

[Resources]

Average visibility in September
Big Timber, MT

Average visibility in September - Big Timber, 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).

[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