September weather forecast and climate
Bismarck, ND

The historical building of the State Capitol in Bismarck, North Dakota
The historical building of the State Capitol in Bismarck, North Dakota

Weather in September

The first month of the autumn, September, is also an agreeable month in Bismarck, North Dakota, with temperature in the range of an average low of 52°F (11.1°C) and an average high of 72°F (22.2°C).

Temperature

In September, the average high-temperature decreases, from a warm 82.2°F (27.9°C) in August, to a pleasant 72°F (22.2°C). In September, in Bismarck, the average low-temperature is 52°F (11.1°C).

Humidity

The average relative humidity in Bismarck is 57%.

Rainfall

In Bismarck, it is raining for 8.9 days, with typically 1.22" (31mm) of accumulated precipitation. In Bismarck, during the entire year, the rain falls for 105.9 days and collects up to 15" (381mm) of precipitation.

Snowfall

June through September are months without snowfall in Bismarck.

Daylight

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

Sunshine

In Bismarck, 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 medium vulnerability from unsafe exposure to the UV radiation for the ordinary 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 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 Bismarck?

In Bismarck, North Dakota, in September, the average high-temperature is 72°F (22.2°C), and the average low-temperature is 52°F (11.1°C).

What is the average humidity in September in Bismarck?

The average relative humidity in September in Bismarck, North Dakota, is 57%.

How many days does it rain in September in Bismarck?

In Bismarck, North Dakota, in September, it is raining for 8.9 days, with typically 1.22" (31mm) of accumulated precipitation.

Does it snow in Bismarck in September?

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

When it does not snow in Bismarck?

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

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

The average length of the day in September in Bismarck, North Dakota, is 12.5h.

How many hours of sunshine does Bismarck have in September?

In Bismarck, North Dakota, the average sunshine in September is 8.6h.

What is the UV index intensity in September in Bismarck?

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

Average temperature in September
Bismarck, ND

Average temperature in September - Bismarck, ND
  • Average high temperature in September: 72°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (20.8°F).

  • Average low temperature in September: 52°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 (6.1°F).

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Average pressure in September
Bismarck, ND

Average pressure in September - Bismarck, 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
Bismarck, ND

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

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

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Average humidity in September
Bismarck, ND

Average humidity in September - Bismarck, 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
Bismarck, ND

Average rainfall in September - Bismarck, ND
  • Average rainfall in September: 1.22"

The wettest month (with the highest rainfall) is June (2.28").
The driest month (with the least rainfall) is January (0.59").

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Average rainfall days in September
Bismarck, ND

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

The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is February (3.4 days).

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Average snowfall in September
Bismarck, ND

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

The month with the highest snowfall is February (4.33").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Bismarck, ND

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

The month with the highest number of snowfall days is December (15.7 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
Bismarck, ND

Average daylight in September / Average sunshine in September - Bismarck, 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: 11.4h).
The month with the least sunshine is January (Average sunshine: 3.8h).

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Average sunshine days in September
Bismarck, ND

Average sunshine days in September - Bismarck, ND
  • Average sunshine days in September: 19.9 days

The month with the most sunshine days is September (19.9 days).
The month with the least sunshine days is March (12.3 days).

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Average UV index in September
Bismarck, ND

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

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Average cloud cover in September
Bismarck, ND

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

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

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Average visibility in September
Bismarck, ND

Average visibility in September - Bismarck, 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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