September weather forecast and climate
Stanley, ND

Weather in September

September, the first month of the autumn, in Stanley, is still a pleasant month, with average temperature fluctuating between 51.1°F (10.6°C) and 70.7°F (21.5°C).

Temperature

In Stanley, the average high-temperature decreases, from a moderately hot 81.1°F (27.3°C) in August, to an agreeable 70.7°F (21.5°C). In September, the average low-temperature is 51.1°F (10.6°C).

Humidity

The average relative humidity is 54%.

Rainfall

In Stanley, during September, the rain falls for 6.9 days and regularly aggregates up to 0.94" (24mm) of precipitation. In Stanley, during the entire year, the rain falls for 69.9 days and collects up to 6.77" (172mm) of precipitation.

Snowfall

June through September are months without snowfall in Stanley.

Daylight

In Stanley, the average length of the day is 12.6h.

Sunshine

The average sunshine in September is 8.5h.

UV index

In Stanley, North Dakota, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Stanley?

The average high-temperature, in September, in Stanley, North Dakota, is 70.7°F (21.5°C), while the average low-temperature is 51.1°F (10.6°C).

What is the average humidity in September in Stanley?

In Stanley, North Dakota, the average relative humidity in September is 54%.

How much does it rain in Stanley in September?

In Stanley, during September, the rain falls for 6.9 days and regularly aggregates up to 0.94" (24mm) of precipitation.

Does it snow in Stanley in September?

In Stanley, North Dakota, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Stanley?

In Stanley, North Dakota, snow does not fall in June through September.

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

In Stanley, the average length of the day in September is 12.6h.

How long on average sun shines in September in Stanley?

In Stanley, the average sunshine in September is 8.5h.

How high is the UV index in September in Stanley?

In Stanley, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Stanley, ND

Average temperature in September - Stanley, ND
  • Average high temperature in September: 70.7°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (19.8°F).

  • Average low temperature in September: 51.1°F

The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is January (5.7°F).

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Average pressure in September
Stanley, ND

Average pressure in September - Stanley, ND
  • Average pressure in September: 29.94"

The month with the highest atmospheric pressure is February (30.17").
The month with the lowest atmospheric pressure is June (29.84").

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Average wind speed in September
Stanley, ND

Average wind speed in September - Stanley, ND
  • Average wind speed in September: 9.8mph

The windiest months (with the highest average wind speed) are April and October (10.7mph).
The calmest month (with the lowest average wind speed) is August (8.6mph).

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Average humidity in September
Stanley, ND

Average humidity in September - Stanley, ND
  • Average humidity in September: 54%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (52%).

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Average rainfall in September
Stanley, ND

Average rainfall in September - Stanley, ND
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is June (1.18").
The driest months (with the least rainfall) are January and February (0.2").

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Average rainfall days in September
Stanley, ND

Average rainfall days in September - Stanley, ND
  • Average rainfall days in September: 6.9 days

The month with the highest number of rainy days is June (11.3 days).
The month with the least rainy days is February (1.6 days).

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Average snowfall in September
Stanley, ND

Average snowfall in September - Stanley, ND
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.14").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Stanley, ND

Average snowfall days in September - Stanley, ND
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (10.9 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Stanley, ND

Average daylight in September / Average sunshine in September - Stanley, ND
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is July (Average sunshine: 11.3h).
Months with the least sunshine are January and December (Average sunshine: 3.9).

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Average sunshine days in September
Stanley, ND

Average sunshine days in September - Stanley, ND
  • Average sunshine days in September: 21.1 days

The month with the most sunshine days is November (22.7 days).
The month with the least sunshine days is June (15.7 days).

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Average UV index in September
Stanley, ND

Average UV index in September - Stanley, ND
  • 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
Stanley, ND

Average cloud cover in September - Stanley, ND
  • Average cloud cover in September: 26

The month with the most cloud cover is February (Cloud cover 62).
Months with the least cloud cover are July and August (Cloud cover 22).

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Average visibility in September
Stanley, ND

Average visibility in September - Stanley, ND
  • Average visibility in September: 6mi

Months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January and February (5mi).

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