Billings
Montana, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Billings, MT

The unique view of the forest of trees in the plains, on the sandstone bluffs in Billings, Montana, a beautiful cloudy sky above
The unique view of the forest of trees in the plains, on the sandstone bluffs in Billings, Montana, a beautiful cloudy sky above
September, the first month of the autumn, in Billings, is still a pleasant month, with average temperature varying between 47.5°F (8.6°C) and 73°F (22.8°C).

Temperature

In Billings, the average high-temperature in September drops, from a warm 85.6°F (29.8°C) in August, to a pleasant 73°F (22.8°C). In September, in Billings, the average low-temperature is 47.5°F (8.6°C).

Humidity

In September, the average relative humidity is 51.6%.

Rainfall

In Billings, it is raining for 7.1 days, with typically 1.3" (33mm) of accumulated precipitation. Throughout the year, in Billings, there are 96.5 rainfall days, and 13.7" (347mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Billings are January through May, September through December.

Daylight

In September, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine is 8.5h.

UV index

In September, the average daily maximum UV index in Billings is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV radiation for the ordinary person.
The daily maximum UV index of 6 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in September in Billings?

In September, the average high-temperature is 73°F (22.8°C), and the average low-temperature is 47.5°F (8.6°C).

What is the average humidity in September in Billings?

In September, the average relative humidity in Billings, Montana, is 51.6%.

How much does it rain in Billings in September?

In Billings, Montana, during September, the rain falls for 7.1 days and regularly aggregates up to 1.3" (33mm) of precipitation.

When does it start to snow in Billings?

September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 1.1" (27.9mm) of snow.

What is the average length of the day in September in Billings?

In September, the average length of the day is 12.5h.

How many hours of sunshine does Billings have in September?

The average sunshine in September in Billings is 8.5h.

What is the UV index intensity in September in Billings?

In Billings, Montana, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Billings, MT
  • Average high temperature in September: 73.1°F

The warmest month (with the highest average high temperature) is July (86.8°F).
The month with the lowest average high temperature is December (35.2°F).

  • Average low temperature in September: 47.5°F

The month with the highest average low temperature is July (58.8°F).
Coldest months (with the lowest average low temperature) are January and December (17.8°F).

Average humidity in September - Billings, MT
  • Average humidity in September: 51.6%

The month with the highest relative humidity is December (60.9%).
The month with the lowest relative humidity is August (44.5%).

Average rainfall in September - Billings, MT
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is May (2.2").
Driest months (with the lowest rainfall) are January, February and December (0.5").

Average rainfall days in September - Billings, MT
  • Average rainfall days in September: 7.1 days

The month with the highest number of rainy days is May (12 days).
The month with the lowest number of rainy days is August (6 days).

Average snowfall in September - Billings, MT
  • Average snowfall in September: 1.1"

The month with the highest snowfall is March (10.2").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in September - Billings, MT
  • Average snowfall days in September: 0.5 days

Months with the highest number of snowfall days are March and December (6.9 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight in September / Average sunshine in September - Billings, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.7h).
The month with shortest days is December (Average daylight: 8.7h).

  • Average sunshine in September: 8.5h

The month with most sunshine is July (Average sunshine: 11.5h).
The month with least sunshine is December (Average sunshine: 3.8h).

Average UV index in September - Billings, MT
  • Average UV index in September: 6

The month with the highest UV index is July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).