September weather forecast
Riverdale, ND

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Weather in September

The first month of the autumn, September, is also an agreeable month in Riverdale, North Dakota, with temperature in the range of an average high of 70.7°F (21.5°C) and an average low of 51.3°F (10.7°C).

Temperature

The decrease of average high-temperatures is mild in September, with a decline from a moderately hot 81.1°F (27.3°C) in August to an agreeable 70.7°F (21.5°C). In the month of September, Riverdale records a consistent average low-temperature of 51.3°F (10.7°C).

Humidity

In September, the average relative humidity is 56%.

Rainfall

In Riverdale, during September, the rain falls for 9 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, there are 95.9 rainfall days, and 14.65" (372mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Riverdale.

Daylight

The average length of the day in September in Riverdale is 12h and 33min.
On the first day of the month, sunrise is at 7:05 am and sunset at 8:25 pm. On the last day of September, in Riverdale, sunrise is at 7:44 am and sunset at 7:26 pm CDT.

Sunshine

The average sunshine in September is 8.6h.

UV index

In Riverdale, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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Frequently asked questions

What are September temperatures in Riverdale?

In September, in Riverdale, the average high-temperature is 70.7°F (21.5°C), and the average low-temperature is 51.3°F (10.7°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in August is appraised at 82.4°F (28°C).

What is the average humidity in September in Riverdale?

The average relative humidity in September in Riverdale, North Dakota, is 56%.

How much does it rain in Riverdale in September?

In Riverdale, North Dakota, in September, during 9 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

When it does not snow in Riverdale?

June through September are months without snowfall in Riverdale.

Does it snow in Riverdale in September?

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

How many hours of daylight does Riverdale have in September?

In Riverdale, North Dakota, the average day length in September is 12h and 33min.

What time are sunrise and sunset in September in Riverdale?

On the first day of September in Riverdale, North Dakota, sunrise is at 7:05 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 7:26 pm CDT.

How many hours of sunshine does Riverdale have in September?

In Riverdale, the average sunshine duration in September is 8.6h.

How high is the UV index in September in Riverdale?

In September, the average daily maximum UV index in Riverdale, North Dakota, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Riverdale, ND

Average temperature in September - Riverdale, ND
  • Average high temperature in September: 70.7°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (19.6°F).

  • Average low temperature in September: 51.3°F

The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).

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Average pressure in September
Riverdale, ND

Average pressure in September - Riverdale, ND
  • Average pressure in September: 29.94"Hg

The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in September
Riverdale, ND

Average wind speed in September - Riverdale, ND
  • Average wind speed in September: 10mph

The windiest month (with the highest average wind speed) is October (11mph).
The calmest month (with the lowest average wind speed) is August (8.6mph).

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Average humidity in September
Riverdale, ND

Average humidity in September - Riverdale, ND
  • Average humidity in September: 56%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (54%).

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Average rainfall in September
Riverdale, ND

Average rainfall in September - Riverdale, ND
  • Average rainfall in September: 2.05"

The wettest month (with the highest rainfall) is June (2.64").
The driest month (with the least rainfall) is February (0.39").

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Average rainfall days in September
Riverdale, ND

Average rainfall days in September - Riverdale, ND
  • Average rainfall days in September: 9 days

The month with the highest number of rainy days is June (13.9 days).
The month with the least rainy days is February (2.1 days).

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Average snowfall in September
Riverdale, ND

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

The month with the highest snowfall is January (3.31").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Riverdale, ND

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

The month with the highest number of snowfall days is December (13 days).
The 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
Riverdale, ND

Average daylight in September / Average sunshine in September - Riverdale, ND
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 18min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).

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Average sunshine days in September
Riverdale, ND

Average sunshine days in September - Riverdale, 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 March (13.9 days).

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Average UV index in September
Riverdale, ND

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

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and December (UV index 1).

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Average cloud cover in September
Riverdale, ND

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

The month with the most cloud cover is February (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 22).

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Average visibility in September
Riverdale, ND

Average visibility in September - Riverdale, ND
  • Average visibility in September: 6mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).

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Riverdale, North Dakota, USA

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