September weather forecast and climate
Underwood, ND

The first month of the autumn, September, is also an agreeable month in Underwood, North Dakota, with average temperature varying between 71.1°F (21.7°C) and 51.3°F (10.7°C).

Temperature

In Underwood, North Dakota, the average high-temperature drops, from a warm 81.3°F (27.4°C) in August, to a pleasant 71.1°F (21.7°C). In September, the average low-temperature is 51.3°F (10.7°C).

Humidity

The average relative humidity in September is 57%.

Rainfall

In September, in Underwood, North Dakota, the rain falls for 9.1 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. Throughout the year, in Underwood, there are 100.5 rainfall days, and 15.2" (386mm) of precipitation is accumulated.

Snowfall

In Underwood snow does not fall in June through September.

Daylight

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

Sunshine

In September, the average sunshine in Underwood is 8.6h.

UV index

In Underwood, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in September in Underwood?

In September, in Underwood, the average high-temperature is 71.1°F (21.7°C), and the average low-temperature is 51.3°F (10.7°C).

What is the average humidity in September in Underwood?

In Underwood, the average relative humidity in September is 57%.

How many days does it rain in September in Underwood?

In Underwood, North Dakota, in September, it is raining for 9.1 days, with typically 1.77" (45mm) of accumulated precipitation.

Does it snow in Underwood in September?

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

When it does not snow in Underwood?

June through September are months without snowfall in Underwood.

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

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

How long on average sun shines in September in Underwood?

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

What is the UV index intensity in September in Underwood?

In September, the average daily maximum UV index in Underwood is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.
Average temperature in September - Underwood, ND
  • Average high temperature in September: 21.7°C

The warmest month (with the highest average high temperature) is July (27.9°C).
The month with the lowest average high temperature is January (-6.8°C).

  • Average low temperature in September: 10.7°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 (-14.8°C).

Average pressure in September - Underwood, ND
  • Average pressure in September: 1014.1mbar

The month with the highest atmospheric pressure is February (1021.7mbar).
The month with the lowest atmospheric pressure is June (1010.7mbar).

Average wind speed in September - Underwood, ND
  • Average wind speed in September: 16.5km/h

The windiest months (with the highest average wind speed) are April and October (17.9km/h).
The calmest month (with the lowest average wind speed) is August (14.2km/h).

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

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (55%).

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

The wettest month (with the highest rainfall) is June (66mm).
The driest month (with the least rainfall) is February (13mm).

Average rainfall days in September - Underwood, ND
  • Average rainfall days in September: 9.1 days

The month with the highest number of rainy days is June (14.9 days).
The month with the least rainy days is February (1.9 days).

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

The month with the highest snowfall is January (96mm).
Months with the least snowfall are June, July, August and September (0mm).

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

The month with the highest number of snowfall days is January (15.3 days).
Months with the least snowfall days are June, July and August (0 days).

Average daylight in September / Average sunshine in September - Underwood, 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: 11.3h).
The month with the least sunshine is January (Average sunshine: 3.7h).

Average sunshine days in September - Underwood, ND
  • Average sunshine days in September: 19.8 days

The month with the most sunshine days is September (19.8 days).
The month with the least sunshine days is April (12.8 days).

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

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

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

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

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