September weather forecast and climate
Sand Coulee, MT

Weather in September

The first month of the autumn, September, is also an agreeable month in Sand Coulee, Montana, with temperature in the range of an average high of 70.7°F (21.5°C) and an average low of 50.9°F (10.5°C).

Temperature

In September, the average high-temperature decreases, from a moderately hot 81.5°F (27.5°C) in August, to a pleasant 70.7°F (21.5°C). In September, the average low-temperature is 50.9°F (10.5°C).

Humidity

In Sand Coulee, the average relative humidity is 46%.

Rainfall

In September, in Sand Coulee, the rain falls for 6 days. Throughout September, 0.67" (17mm) of precipitation is accumulated. In Sand Coulee, during the entire year, the rain falls for 85.3 days and collects up to 9.84" (250mm) of precipitation.

Snowfall

Months with snowfall in Sand Coulee are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 1.26" (32mm) of snow. Throughout the year, in Sand Coulee, there are 58.9 snowfall days, and 28.54" (725mm) of snow is accumulated.

Daylight

The average length of the day in Sand Coulee, Montana, is 12.5h.

Sunshine

In Sand Coulee, the average sunshine in September is 9.8h.

UV index

In Sand Coulee, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to the 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 the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Sand Coulee?

In Sand Coulee, the average relative humidity in September is 46%.

How much does it rain in Sand Coulee in September?

In Sand Coulee, in September, during 6 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

When does it start to snow in Sand Coulee?

September is the first month it typically snows in Sand Coulee, Montana. Throughout September, in the average 0.3 snowfall days, it receives 1.26" (32mm) of snow.

What is the average length of the day in September in Sand Coulee?

The average length of the day in September in Sand Coulee, Montana, is 12.5h.

How long on average sun shines in September in Sand Coulee?

The average sunshine in September in Sand Coulee is 9.8h.

How high is the UV index in September in Sand Coulee?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Sand Coulee, MT

Average temperature in September - Sand Coulee, MT
  • Average high temperature in September: 70.7°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (30°F).

  • Average low temperature in September: 50.9°F

The month with the highest average low temperature is August (58.5°F).
The coldest month (with the lowest average low temperature) is February (18.3°F).

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Average pressure in September
Sand Coulee, MT

Average pressure in September - Sand Coulee, MT
  • Average pressure in September: 29.95"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in September
Sand Coulee, MT

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

The windiest months (with the highest average wind speed) are January and November (11.4mph).
The calmest month (with the lowest average wind speed) is August (7.8mph).

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Average humidity in September
Sand Coulee, MT

Average humidity in September - Sand Coulee, MT
  • Average humidity in September: 46%

The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in September
Sand Coulee, MT

Average rainfall in September - Sand Coulee, MT
  • Average rainfall in September: 0.67"

The wettest month (with the highest rainfall) is June (1.57").
The driest month (with the least rainfall) is July (0.47").

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Average rainfall days in September
Sand Coulee, MT

Average rainfall days in September - Sand Coulee, MT
  • Average rainfall days in September: 6 days

The month with the highest number of rainy days is May (11.7 days).
Months with the least rainy days are November and December (4 days).

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Average snowfall in September
Sand Coulee, MT

Average snowfall in September - Sand Coulee, MT
  • Average snowfall in September: 1.26"

The month with the highest snowfall is February (5.67").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Sand Coulee, MT

Average snowfall days in September - Sand Coulee, MT
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is February (12.9 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Sand Coulee, MT

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

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 9.8h

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 5.6).

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Average sunshine days in September
Sand Coulee, MT

Average sunshine days in September - Sand Coulee, MT
  • Average sunshine days in September: 23.1 days

The month with the most sunshine days is July (24.2 days).
The month with the least sunshine days is February (12.4 days).

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Average UV index in September
Sand Coulee, MT

Average UV index in September - Sand Coulee, MT
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
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
Sand Coulee, MT

Average cloud cover in September - Sand Coulee, MT
  • Average cloud cover in September: 22

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 13).

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Average visibility in September
Sand Coulee, MT

Average visibility in September - Sand Coulee, MT
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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