September weather forecast
Bynum, MT

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Weather in September

September, the first month of the autumn in Bynum, is still a pleasant month, with temperature in the range of an average high of 68.2°F (20.1°C) and an average low of 48.6°F (9.2°C).

Temperature

The average high-temperature drops in September, from August's warm 79°F (26.1°C) to a pleasant 68.2°F (20.1°C). In September, Bynum's temperature tends to fall to an average low of 48.6°F (9.2°C) during the night.

Humidity

In September, the average relative humidity in Bynum is 48%.

Rainfall

In Bynum, during September, the rain falls for 6.1 days and regularly aggregates up to 0.79" (20mm) of precipitation. In Bynum, during the entire year, the rain falls for 73.3 days and collects up to 9.17" (233mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows in Bynum. Throughout September, in the average 0.7 snowfall days, it receives 0.55" (14mm) of snow. Throughout the year, there are 50.3 snowfall days, and 21.26" (540mm) of snow is accumulated.

Daylight

In Bynum, the average length of the day in September is 12h and 33min.
On the first day of September, sunrise is at 6:48 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:09 pm MDT.

Sunshine

In September, the average sunshine in Bynum is 9.7h.

UV index

In Bynum, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 4 in September translates into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
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Frequently asked questions

What is the average September temperature in Bynum?

Bynum in September has an average high-temperature of 68.2°F (20.1°C) and an average low-temperature of 48.6°F (9.2°C).

What is the average humidity in September in Bynum?

In September, the average relative humidity in Bynum is 48%.

How many days does it rain in September in Bynum?

In Bynum, in September, during 6.1 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.

When does it start to snow in Bynum?

September is the first month it typically snows in Bynum, Montana. Throughout September, in the average 0.7 snowfall days, it receives 0.55" (14mm) of snow.

How many hours of daylight does Bynum have in September?

The average day length in September in Bynum, Montana, is 12h and 33min.

What time are sunrise and sunset in September in Bynum?

On the first day of September in Bynum, sunrise is at 6:48 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:09 pm MDT.

How many hours of sunshine does Bynum have in September?

In September, the average sunshine duration is 9.7h.

How high is the UV index in September in Bynum?

In Bynum, Montana, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
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
Bynum, MT

Average temperature in September - Bynum, MT
  • Average high temperature in September: 68.2°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 (28.8°F).

  • Average low temperature in September: 48.6°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).

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Average pressure in September
Bynum, MT

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

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in September
Bynum, MT

Average wind speed in September - Bynum, MT
  • Average wind speed in September: 8.8mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8mph).

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Average humidity in September
Bynum, MT

Average humidity in September - Bynum, MT
  • Average humidity in September: 48%

The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in September
Bynum, MT

Average rainfall in September - Bynum, MT
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is June (1.93").
The driest month (with the least rainfall) is December (0.35").

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Average rainfall days in September
Bynum, MT

Average rainfall days in September - Bynum, MT
  • Average rainfall days in September: 6.1 days

The month with the highest number of rainy days is May (11.3 days).
The month with the least rainy days is November (2.7 days).

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Average snowfall in September
Bynum, MT

Average snowfall in September - Bynum, MT
  • Average snowfall in September: 0.55"

The month with the highest snowfall is February (4.17").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Bynum, MT

Average snowfall days in September - Bynum, MT
  • Average snowfall days in September: 0.7 days

The month with the highest number of snowfall days is February (11.3 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in September / Average sunshine in September - Bynum, MT
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in September
Bynum, MT

Average sunshine days in September - Bynum, MT
  • Average sunshine days in September: 21 days

The month with the most sunshine days is October (23.2 days).
The month with the least sunshine days is February (15.8 days).

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Average UV index in September
Bynum, MT

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

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

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Average cloud cover in September
Bynum, MT

Average cloud cover in September - Bynum, MT
  • Average cloud cover in September: 22

The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 14).

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Average visibility in September
Bynum, MT

Average visibility in September - Bynum, 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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Bynum, Montana, USA

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