September weather forecast and climate
Portland, ND

The first month of the autumn, September, is still a pleasant month in Portland, North Dakota, with average temperature fluctuating between 70.7°F (21.5°C) and 52°F (11.1°C).

Temperature

In Portland, the average high-temperature in September decreases, from a moderately hot 80.4°F (26.9°C) in August, to a pleasant 70.7°F (21.5°C). The average low-temperature, in September, is 52°F (11.1°C).

Humidity

In Portland, North Dakota, the average relative humidity in September is 62%.

Rainfall

In September, in Portland, the rain falls for 8.6 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. In Portland, during the entire year, the rain falls for 101.8 days and collects up to 18.23" (463mm) of precipitation.

Snowfall

In Portland snow does not fall in June through September.

Daylight

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

Sunshine

In Portland, the average sunshine is 8.6h.

UV index

In September, the average daily maximum UV index in Portland is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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.

What is the temperature in September in Portland?

In Portland, North Dakota, in September, the average high-temperature is 70.7°F (21.5°C), and the average low-temperature is 52°F (11.1°C).

What is the average humidity in September in Portland?

In Portland, the average relative humidity in September is 62%.

How many days does it rain in September in Portland?

In Portland, during September, the rain falls for 8.6 days and regularly aggregates up to 1.77" (45mm) of precipitation.

Does it snow in Portland in September?

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

When it does not snow in Portland?

June through September are months without snowfall.

How many hours of daylight does Portland have in September?

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

How long on average sun shines in September in Portland?

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

What is the UV index intensity in September in Portland?

In September, the average daily maximum UV index in Portland is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in September - Portland, ND
  • Average high temperature in September: 21.5°C

The warmest months (with the highest average high temperature) are July and August (26.9°C).
The month with the lowest average high temperature is January (-9.1°C).

  • Average low temperature in September: 11.1°C

The month with the highest average low temperature is July (15.7°C).
The coldest month (with the lowest average low temperature) is January (-16.8°C).

Average pressure in September - Portland, ND
  • Average pressure in September: 1014.6mbar

The month with the highest atmospheric pressure is February (1021.7mbar).
The month with the lowest atmospheric pressure is June (1011.1mbar).

Average wind speed in September - Portland, ND
  • Average wind speed in September: 16.1km/h

The windiest month (with the highest average wind speed) is October (17.6km/h).
The calmest month (with the lowest average wind speed) is July (13.3km/h).

Average humidity in September - Portland, ND
  • Average humidity in September: 62%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (61%).

Average rainfall in September - Portland, ND
  • Average rainfall in September: 45mm

The wettest month (with the highest rainfall) is June (89mm).
The driest months (with the least rainfall) are January and February (14mm).

Average rainfall days in September - Portland, ND
  • Average rainfall days in September: 8.6 days

The month with the highest number of rainy days is June (16.9 days).
The month with the least rainy days is February (1.9 days).

Average snowfall in September - Portland, ND
  • Average snowfall in September: 0mm

The month with the highest snowfall is December (108mm).
Months with the least snowfall are June, July, August and September (0mm).

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

The month with the highest number of snowfall days is December (14 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Portland, ND
  • 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: 8.6h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 3.3h).

Average sunshine days in September - Portland, ND
  • Average sunshine days in September: 20.4 days

The month with the most sunshine days is September (20.4 days).
The month with the least sunshine days is June (10.3 days).

Average UV index in September - Portland, ND
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February and November (UV index 1).

Average cloud cover in September - Portland, ND
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 25).

Average visibility in September - Portland, ND
  • Average visibility in September: 10km

Months with the highest visibility are May, August and September (10km).
Months with the lowest visibility are January, February, March and December (8km).