September weather forecast
Birney, MT

Share

Weather in September

The first month of the autumn, September, is still a warm month in Birney, Montana, with an average temperature ranging between min 52.7°F (11.5°C) and max 74.1°F (23.4°C).

Temperature

Stepping into September, Birney observes a temperature decline, with the average high falling from August's warm 83.7°F (28.7°C) to a still moderately hot 74.1°F (23.4°C). In Birney, the nighttime temperature averages to a cool 52.7°F (11.5°C) during September.

Humidity

In Birney, Montana, the average relative humidity in September is 44%.

Rainfall

In Birney, in September, during 8.6 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Birney, during the entire year, the rain falls for 127.6 days and collects up to 14.25" (362mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Birney. September is the first month it typically snows in Birney. Throughout September, in the average 0.2 snowfall days, it receives 0.12" (3mm) of snow. In Birney, during the entire year, snow falls for 65.3 days and aggregates up to 28.82" (732mm) of snow.

Daylight

In Birney, the average length of the day in September is 12h and 31min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:42 pm. On the last day of September, in Birney, sunrise is at 7:03 am and sunset at 6:47 pm MDT.

Sunshine

In September, the average sunshine in Birney, Montana, is 10.8h.

UV index

In September, the average daily maximum UV index in Birney is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the UV index of 4 transforms into the following advice:
Heed the precautions - Suggestions to avoid sunburn are made. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
[Resources]

Frequently asked questions

What are September temperatures in Birney?

During September, Birney experiences an average high-temperature of 74.1°F (23.4°C) and a low-temperature of 52.7°F (11.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, in August is evaluated at 82.4°F (28°C).

What is the average humidity in September in Birney?

In September, the average relative humidity in Birney, Montana, is 44%.

How many days does it rain in September in Birney?

In September, in Birney, Montana, the rain falls for 8.6 days. Throughout September, 0.83" (21mm) of precipitation is accumulated.

When does it start snowing in Birney?

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

How many hours of daylight does Birney have in September?

In Birney, the average day length in September is 12h and 31min.

When is the sunrise / sunset in September in Birney?

On the first day of September in Birney, sunrise is at 6:28 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:47 pm MDT.

How many hours of sunshine does Birney have in September?

The average sunshine duration in September in Birney is 10.8h.

What is the UV index intensity in September in Birney?

The average daily maximum UV index in September is 4. A UV Index reading 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Birney, MT

Average temperature in September - Birney, MT
  • Average high temperature in September: 74.1°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (31.1°F).

  • Average low temperature in September: 52.7°F

The month with the highest average low temperature is July (61.5°F).
The coldest months (with the lowest average low temperature) are January and February (16.2°F).

[Resources]

Average pressure in September
Birney, MT

Average pressure in September - Birney, MT
  • Average pressure in September: 29.93"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

[Resources]

Average wind speed in September
Birney, MT

Average wind speed in September - Birney, MT
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest months (with the lowest average wind speed) are July and December (6.8mph).

[Resources]

Average humidity in September
Birney, MT

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

The months with the highest relative humidity are January and February (79%).
The month with the lowest relative humidity is August (40%).

[Resources]

Average rainfall in September
Birney, MT

Average rainfall in September - Birney, MT
  • Average rainfall in September: 0.83"

The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is December (0.67").

[Resources]

Average rainfall days in September
Birney, MT

Average rainfall days in September - Birney, MT
  • Average rainfall days in September: 8.6 days

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (6.3 days).

[Resources]

Average snowfall in September
Birney, MT

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

The month with the highest snowfall is February (5.2").
The months with the least snowfall are June, July and August (0").

[Resources]

Average snowfall days in September
Birney, MT

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

The month with the highest number of snowfall days is February (14.3 days).
The months with the least snowfall days are June, July and August (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Birney, MT
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 10h and 5min

The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).

[Resources]

Average sunshine days in September
Birney, MT

Average sunshine days in September - Birney, MT
  • Average sunshine days in September: 18.2 days

The month with the most sunshine days is September (18.2 days).
The month with the least sunshine days is May (9.6 days).

[Resources]

Average UV index in September
Birney, MT

Average UV index in September - Birney, 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).

[Resources]

Average cloud cover in September
Birney, MT

Average cloud cover in September - Birney, MT
  • Average cloud cover in September: 18

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 14).

[Resources]

Average visibility in September
Birney, MT

Average visibility in September - Birney, 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]

Birney, Montana, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location