September weather forecast and climate
Rolla, ND

Weather in September

The first month of the autumn, September, is also an enjoyable month in Rolla, North Dakota, with average temperature varying between 67.6°F (19.8°C) and 49.1°F (9.5°C).

Temperature

In Rolla, the average high-temperature decreases, from a warm 77.9°F (25.5°C) in August, to a comfortable 67.6°F (19.8°C). In Rolla, in September, the average low-temperature is 49.1°F (9.5°C).

Humidity

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

Rainfall

In Rolla, during 11.3 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. In Rolla, during the entire year, the rain falls for 110.9 days and collects up to 17.95" (456mm) of precipitation.

Snowfall

In Rolla snow does not fall in June through September.

Daylight

In Rolla, the average length of the day in September is 12.6h.

Sunshine

In Rolla, the average sunshine is 8.5h.

UV index

In Rolla, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. 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.
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FAQ

What is the temperature in September in Rolla?

In September, in Rolla, North Dakota, the average high-temperature is 67.6°F (19.8°C), and the average low-temperature is 49.1°F (9.5°C).

What is the average humidity in September in Rolla?

The average relative humidity in September is 62%.

How many days does it rain in September in Rolla?

In Rolla, during September, the rain falls for 11.3 days and regularly aggregates up to 2.01" (51mm) of precipitation.

Does it snow in Rolla in September?

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

When it does not snow in Rolla?

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

How many hours of daylight does Rolla have in September?

In Rolla, the average length of the day in September is 12.6h.

How long on average sun shines in September in Rolla?

The average sunshine in September is 8.5h.

What is the UV index intensity in September in Rolla?

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Rolla, ND

Average temperature in September - Rolla, ND
  • Average high temperature in September: 67.6°F

The warmest month (with the highest average high temperature) is August (77.9°F).
The month with the lowest average high temperature is January (14.2°F).

  • Average low temperature in September: 49.1°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (0.5°F).

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Average pressure in September
Rolla, ND

Average pressure in September - Rolla, ND
  • Average pressure in September: 29.95"

The month with the highest atmospheric pressure is February (30.17").
The month with the lowest atmospheric pressure is June (29.85").

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Average wind speed in September
Rolla, ND

Average wind speed in September - Rolla, ND
  • Average wind speed in September: 9.8mph

The windiest month (with the highest average wind speed) is October (11mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).

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Average humidity in September
Rolla, ND

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

The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (60%).

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Average rainfall in September
Rolla, ND

Average rainfall in September - Rolla, ND
  • Average rainfall in September: 2.01"

The wettest month (with the highest rainfall) is June (3.27").
The driest month (with the least rainfall) is February (0.43").

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Average rainfall days in September
Rolla, ND

Average rainfall days in September - Rolla, ND
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is February (2 days).

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Average snowfall in September
Rolla, ND

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

The month with the highest snowfall is November (4.29").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Rolla, ND

Average snowfall days in September - Rolla, 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).

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Average daylight in September /
Average sunshine in September
Rolla, ND

Average daylight in September / Average sunshine in September - Rolla, ND
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is January (Average sunshine: 3.1h).

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Average sunshine days in September
Rolla, ND

Average sunshine days in September - Rolla, ND
  • Average sunshine days in September: 16.8 days

The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is June (8.1 days).

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Average UV index in September
Rolla, ND

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

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February and December (UV index 1).

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Average cloud cover in September
Rolla, ND

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

The month with the most cloud cover is February (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in September
Rolla, ND

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

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

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