September weather forecast and climate
Mandan, ND

Scenic fields and vast spaces laden with green trees and shrubs in this place near the Mandan Community of North Dakota
Scenic fields and vast spaces laden with green trees and shrubs in this place near the Mandan Community of North Dakota

Weather in September

September, the first month of the autumn, in Mandan, is still a pleasant month, with average temperature varying between 71.8°F (22.1°C) and 51.8°F (11°C).

Temperature

In Mandan, North Dakota, the average high-temperature drops, from a moderately hot 82°F (27.8°C) in August, to an agreeable 71.8°F (22.1°C). The average low-temperature, in September, is 51.8°F (11°C).

Humidity

In September, the average relative humidity is 57%.

Rainfall

In Mandan, during 8.9 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. Throughout the year, there are 94.3 rainfall days, and 14.29" (363mm) of precipitation is accumulated.

Snowfall

In Mandan snow does not fall in June through September.

Daylight

In September, the average length of the day in Mandan is 12.5h.

Sunshine

In Mandan, the average sunshine is 8.6h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the temperature in September in Mandan?

In September, the average high-temperature is 71.8°F (22.1°C), and the average low-temperature is 51.8°F (11°C).

What is the average humidity in September in Mandan?

In September, the average relative humidity in Mandan, North Dakota, is 57%.

How many days does it rain in September in Mandan?

In September, the rain falls for 8.9 days. Throughout September, 1.46" (37mm) of precipitation is accumulated.

Does it snow in Mandan in September?

In Mandan, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Mandan?

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

How many hours of daylight does Mandan have in September?

In September, the average length of the day in Mandan, North Dakota, is 12.5h.

How long on average sun shines in September in Mandan?

The average sunshine in September in Mandan, North Dakota, is 8.6h.

What is the UV index reading in September in Mandan?

The average daily maximum UV index in September in Mandan, North Dakota, is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Mandan, ND

Average temperature in September - Mandan, ND
  • Average high temperature in September: 71.8°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (20.7°F).

  • Average low temperature in September: 51.8°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).

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Average pressure in September
Mandan, ND

Average pressure in September - Mandan, ND
  • Average pressure in September: 29.95"

The month with the highest atmospheric pressure is February (30.17").
The month with the lowest atmospheric pressure is June (29.85").

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Average wind speed in September
Mandan, ND

Average wind speed in September - Mandan, ND
  • Average wind speed in September: 9.9mph

The windiest months (with the highest average wind speed) are April and October (10.8mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).

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Average humidity in September
Mandan, ND

Average humidity in September - Mandan, ND
  • Average humidity in September: 57%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in September
Mandan, ND

Average rainfall in September - Mandan, ND
  • Average rainfall in September: 1.46"

The wettest month (with the highest rainfall) is June (2.32").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in September
Mandan, ND

Average rainfall days in September - Mandan, ND
  • Average rainfall days in September: 8.9 days

The month with the highest number of rainy days is June (13.1 days).
The month with the least rainy days is February (2.3 days).

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Average snowfall in September
Mandan, ND

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

The month with the highest snowfall is December (3.31").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Mandan, ND

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

The month with the highest number of snowfall days is December (12.8 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
Mandan, ND

Average daylight in September / Average sunshine in September - Mandan, ND
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in September: 8.6h

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

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Average sunshine days in September
Mandan, ND

Average sunshine days in September - Mandan, ND
  • Average sunshine days in September: 20.1 days

The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is June (14.6 days).

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Average UV index in September
Mandan, ND

Average UV index in September - Mandan, 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 November and December (UV index 1).

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Average cloud cover in September
Mandan, ND

Average cloud cover in September - Mandan, ND
  • Average cloud cover in September: 25

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 21).

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Average visibility in September
Mandan, ND

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

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

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