September weather forecast
Billings, MT

The forest of trees in the plains, on the sandstone bluffs in Billings, Montana
The forest of trees in the plains, on the sandstone bluffs in Billings, Montana

Weather in September

The first month of the autumn, September, is also an agreeable month in Billings, Montana, with an average temperature varying between 73.2°F (22.9°C) and 52.5°F (11.4°C).

Temperature

In Billings, the average high-temperature in September decreases from a warm 83.1°F (28.4°C) in August to a pleasant 73.2°F (22.9°C). In September, in Billings, Montana, the average low-temperature is 52.5°F (11.4°C).

Humidity

The average relative humidity in September is 44%.

Rainfall

In Billings, it is raining for 9.1 days, with typically 0.98" (25mm) of accumulated precipitation. Throughout the year, there are 128.5 rainfall days, and 14.69" (373mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.12" (3mm) of snow. In Billings, Montana, during the entire year, snow falls for 64.5 days and aggregates up to 31.18" (792mm) of snow.

Daylight

In September, the average length of the day is 12h and 31min.
On the first day of September, sunrise is at 6:35 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:56 pm MDT.

Sunshine

The average sunshine in September is 10.3h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Billings?

The average relative humidity in September in Billings is 44%.

How many days does it rain in September in Billings?

In September, in Billings, the rain falls for 9.1 days. Throughout September, 0.98" (25mm) of precipitation is accumulated.

When does it start snowing in Billings?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.12" (3mm) of snow.

How many hours of daylight does Billings have in September?

The average day length in September is 12h and 31min.

When is the sunrise / sunset in September in Billings?

On the first day of September in Billings, Montana, sunrise is at 6:35 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:56 pm MDT.

How many hours of sunshine does Billings have in September?

The average sunshine duration in September is 10.3h.

What is the UV index reading in September in Billings?

In September, the average daily maximum UV index in Billings, Montana, is 4. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Billings, MT

Average temperature in September - Billings, MT
  • Average high temperature in September: 73.2°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (31.1°F).

  • Average low temperature in September: 52.5°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (18.3°F).

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Average pressure in September
Billings, MT

Average pressure in September - Billings, MT
  • Average pressure in September: 29.94"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in September
Billings, MT

Average wind speed in September - Billings, MT
  • Average wind speed in September: 8mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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Average humidity in September
Billings, MT

Average humidity in September - Billings, MT
  • Average humidity in September: 44%

The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in September
Billings, MT

Average rainfall in September - Billings, MT
  • Average rainfall in September: 0.98"

The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is July (0.71").

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Average rainfall days in September
Billings, MT

Average rainfall days in September - Billings, MT
  • Average rainfall days in September: 9.1 days

The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is January (6.3 days).

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Average snowfall in September
Billings, MT

Average snowfall in September - Billings, MT
  • Average snowfall in September: 0.12"

The month with the highest snowfall is February (6.5").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Billings, MT

Average snowfall days in September - Billings, MT
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is February (13.3 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Billings, MT

Average daylight in September / Average sunshine in September - Billings, 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 18min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

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Average sunshine days in September
Billings, MT

Average sunshine days in September - Billings, MT
  • Average sunshine days in September: 18.8 days

The month with the most sunshine days is September (18.8 days).
The month with the least sunshine days is April (9.9 days).

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Average UV index in September
Billings, MT

Average UV index in September - Billings, MT
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in September
Billings, MT

Average cloud cover in September - Billings, MT
  • Average cloud cover in September: 21

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 15).

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Average visibility in September
Billings, MT

Average visibility in September - Billings, 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).

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