September weather forecast and climate
Bismarck, ND

An across the park view of the historic building of the State Capitol in Bismarck, North Dakota
An across the park view of the historic building of the State Capitol in Bismarck, North Dakota

What is the temperature in September in Bismarck?

In September, in Bismarck, North Dakota, the average high-temperature is 72.1°F (22.3°C), and the average low-temperature is 45°F (7.2°C).

How many days does it rain in September in Bismarck?

In Bismarck, in September, during 7.5 rainfall days, typically, 1.6" (40.4mm) of precipitation is accumulated.

When does it start to snow in Bismarck?

September is the first month it typically snows in Bismarck. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5.1mm) of snow.
Average temperature in September - Bismarck, ND
  • Average high temperature in September: 22.3°C

The warmest month (with the highest average high temperature) is July (29.3°C).
The month with the lowest average high temperature is January (-4.8°C).

  • Average low temperature in September: 7.2°C

The month with the highest average low temperature is July (14.1°C).
The coldest month (with the lowest average low temperature) is January (-16.6°C).

Average humidity in September - Bismarck, ND
  • Average humidity in September: 63.7%

The month with the highest relative humidity is December (74.5%).
The month with the lowest relative humidity is May (60.1%).

Average rainfall in September - Bismarck, ND
  • Average rainfall in September: 40.4mm

The wettest month (with the highest rainfall) is June (80.5mm).
The driest month (with the lowest rainfall) is January (10.9mm).

Average rainfall days in September - Bismarck, ND
  • Average rainfall days in September: 7.5 days

The month with the highest number of rainy days is June (11.2 days).
The month with the lowest number of rainy days is October (6.6 days).

Average snowfall in September - Bismarck, ND
  • Average snowfall in September: 5.1mm

The month with the highest snowfall is December (236.2mm).
Months with the lowest snowfall are June, July and August (0mm).

Average snowfall days in September - Bismarck, ND
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is December (10 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

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 shortest days is December (Average daylight: 8.6h).

  • Average sunshine in September: 8.2h

The month with most sunshine is July (Average sunshine: 11.4h).
The month with least sunshine is December (Average sunshine: 4h).

Average UV index in September - Bismarck, ND
  • Average UV index in September: 5

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).

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