September weather forecast and climate
Arena, ND

September, the first month of the autumn, in Arena, is still a pleasant month, with average temperature ranging between max 72°F (22.2°C) and min 52°F (11.1°C).

Temperature

In September, the average high-temperature drops, from a moderately hot 82.2°F (27.9°C) in August, to a pleasant 72°F (22.2°C). In September, in Arena, North Dakota, the average low-temperature is 52°F (11.1°C).

Humidity

In September, the average relative humidity is 57%.

Rainfall

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

Snowfall

In Arena snow does not fall in June through September.

Daylight

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

Sunshine

In Arena, North Dakota, the average sunshine is 8.6h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Arena?

In September, in Arena, North Dakota, 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 Arena?

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

How many days does it rain in September in Arena?

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

Does it snow in Arena in September?

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

When it does not snow in Arena?

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

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

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

How many hours of sunshine does Arena have in September?

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

What is the UV index intensity in September in Arena?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Arena, ND
  • Average high temperature in September: 22.2°C

The warmest month (with the highest average high temperature) is July (28.7°C).
The month with the lowest average high temperature is January (-6.2°C).

  • Average low temperature in September: 11.1°C

The month with the highest average low temperature is July (16.3°C).
The coldest month (with the lowest average low temperature) is January (-14.4°C).

Average pressure in September - Arena, 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 - Arena, ND
  • Average wind speed in September: 15.7km/h

The windiest month (with the highest average wind speed) is April (17.2km/h).
The calmest month (with the lowest average wind speed) is August (13.4km/h).

Average humidity in September - Arena, 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%).

Average rainfall in September - Arena, ND
  • Average rainfall in September: 31mm

The wettest month (with the highest rainfall) is June (58mm).
The driest month (with the least rainfall) is January (15mm).

Average rainfall days in September - Arena, 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).

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

The month with the highest snowfall is February (110mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September - Arena, 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).

Average daylight in September / Average sunshine in September - Arena, 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: 8.6h).

  • 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).

Average sunshine days in September - Arena, 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).

Average UV index in September - Arena, 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).

Average cloud cover in September - Arena, 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).

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

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