September weather forecast
Belle Fourche, SD

Weather in September

The first month of the autumn, September, is still a warm month in Belle Fourche, South Dakota, with an average temperature varying between 73.9°F (23.3°C) and 53.6°F (12°C).

Temperature

In September, the average high-temperature decreases from a moderately hot 83.1°F (28.4°C) in August to a still warm 73.9°F (23.3°C). In September, in Belle Fourche, South Dakota, the average low-temperature is 53.6°F (12°C).

Humidity

In Belle Fourche, South Dakota, the average relative humidity in September is 48%.

Rainfall

In Belle Fourche, 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

Months with snowfall in Belle Fourche are January through May, September through December. September is the first month it typically snows in Belle Fourche. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 52.1 snowfall days, and 23.54" (598mm) of snow is accumulated.

Daylight

In September, the average length of the day is 12h and 30min.
On the first day of September, sunrise is at 6:18 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:38 pm MDT.

Sunshine

In September, the average sunshine is 10.5h.

UV index

In Belle Fourche, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Belle Fourche?

The average relative humidity in September in Belle Fourche is 48%.

How much does it rain in Belle Fourche in September?

In September, the rain falls for 7.9 days. Throughout September, 0.75" (19mm) of precipitation is accumulated.

When does it start snowing in Belle Fourche?

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

How many hours of daylight does Belle Fourche have in September?

In Belle Fourche, the average day length in September is 12h and 30min.

What time are sunrise and sunset in September in Belle Fourche?

On the first day of September in Belle Fourche, sunrise is at 6:18 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:38 pm MDT.

How long on average sun shines in September in Belle Fourche?

The average sunshine duration in September in Belle Fourche is 10.5h.

What is the UV index intensity in September in Belle Fourche?

In Belle Fourche, South Dakota, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Belle Fourche, SD

Average temperature in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average pressure in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average wind speed in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average humidity in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average rainfall in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average rainfall days in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average snowfall in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average snowfall days in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average daylight in September / Average sunshine in September - Belle Fourche, SD
  • Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 31min).
The month with the shortest days is December (Average daylight: 8h and 53min).

  • Average sunshine in September: 10h and 30min

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
Belle Fourche, SD

Average sunshine days in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average UV index in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average cloud cover in September - Belle Fourche, SD
  • 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
Belle Fourche, SD

Average visibility in September - Belle Fourche, SD
  • 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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