September weather forecast
Boyes, MT

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Weather in September

September, the first month of the autumn in Boyes, is also a moderately hot month, with temperature in the range of an average low of 53.6°F (12°C) and an average high of 73.9°F (23.3°C).

Temperature

With the onset of September, Boyes experiences a modest temperature adjustment, with the average high-temperature receding from a moderately hot 83.1°F (28.4°C) in August to a still warm 73.9°F (23.3°C). In September, the temperature drops to an average of 53.6°F (12°C) at night.

Humidity

The average relative humidity in September is 48%.

Rainfall

In Boyes, in September, it is raining for 7.9 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 100 rainfall days, and 12.83" (326mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Boyes. September is the first month it typically snows in Boyes. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. In Boyes, during the entire year, snow falls for 52.1 days and aggregates up to 23.54" (598mm) of snow.

Daylight

In September, the average length of the day is 12h and 31min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:36 pm. On the last day of September, in Boyes, sunrise is at 6:58 am and sunset at 6:41 pm MDT.

Sunshine

In Boyes, the average sunshine in September is 10.5h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 4 in September translates into this advice:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
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Frequently asked questions

What is the temperature in September in Boyes?

In September, in Boyes, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 53.6°F (12°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, in August is computed to be 84.2°F (29°C).

What is the average humidity in September in Boyes?

The average relative humidity in September in Boyes, Montana, is 48%.

How many days does it rain in September in Boyes?

In Boyes, in September, during 7.9 rainfall days, 0.75" (19mm) of precipitation is typically accumulated.

When does it start snowing in Boyes?

September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow.

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

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

What time are sunrise and sunset in September in Boyes?

In September, on the first day of the month, sunrise is at 6:22 am and sunset at 7:36 pm. On the last day of the month, in Boyes, Montana, sunrise is at 6:58 am and sunset at 6:41 pm MDT.

How many hours of sunshine does Boyes have in September?

In Boyes, Montana, the average sunshine duration in September is 10.5h.

What is the UV index intensity in September in Boyes?

In September, the average daily maximum UV index in Boyes is 4. A UV Index reading of 3 to 5 represents a moderate health threat 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
Boyes, MT

Average temperature in September - Boyes, MT
  • Average high temperature in September: 73.9°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (30.4°F).

  • Average low temperature in September: 53.6°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).

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Average pressure in September
Boyes, MT

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

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in September
Boyes, MT

Average wind speed in September - Boyes, MT
  • Average wind speed in September: 9.1mph

The windiest months (with the highest average wind speed) are January and October (10.4mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

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Average humidity in September
Boyes, MT

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

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

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Average rainfall in September
Boyes, MT

Average rainfall in September - Boyes, MT
  • Average rainfall in September: 0.75"

The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in September
Boyes, MT

Average rainfall days in September - Boyes, MT
  • Average rainfall days in September: 7.9 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (2.8 days).

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Average snowfall in September
Boyes, MT

Average snowfall in September - Boyes, MT
  • Average snowfall in September: 0.08"

The month with the highest snowfall is April (4.88").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Boyes, MT

Average snowfall days in September - Boyes, MT
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (10.3 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
Boyes, MT

Average daylight in September / Average sunshine in September - Boyes, 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 3min

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).

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Average sunshine days in September
Boyes, MT

Average sunshine days in September - Boyes, MT
  • Average sunshine days in September: 19.4 days

The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is April (12.6 days).

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Average UV index in September
Boyes, MT

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Boyes, MT

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

The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in September
Boyes, MT

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

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