September weather forecast
Casselton, ND

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Weather in September

The advent of September introduces a noticeable shift in Casselton's climatic conditions. The scenic allure of fall takes effect, accompanied by a significant dip in temperature to a high of 71.8°F (22.1°C). The local parks and streets begin their annual transformation, with the greenery giving way to an array of warm, vibrant colors. Although it marks the beginning of the end of summer, September is a beautifully transitional month that offers a mild prelude to the colder months forthcoming. Anticipation builds for the familiar chill and beauty of October, making September a bittersweet farewell to the warmth and energy of summer.

Temperature

September in Casselton brings a decrease in the average high-temperature, falling from August's moderately hot 80.8°F (27.1°C) to a pleasant 71.8°F (22.1°C). Casselton's average low-temperature for the month of September records at a cool 52.7°F (11.5°C).

Humidity

The least humid month in Casselton, North Dakota, is September, with an average relative humidity of 62%.

Rainfall

In Casselton, during September, the rain falls for 8.3 days and regularly aggregates up to 1.54" (39mm) of precipitation. In Casselton, North Dakota, during the entire year, the rain falls for 102.6 days and collects up to 17.8" (452mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 32min.
On the first day of September, sunrise is at 6:49 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:09 pm CDT.

Sunshine

In September, the average sunshine is 8.8h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
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Frequently asked questions

What is the average September temperature in Casselton?

In Casselton, 71.8°F (22.1°C) is the average high-temperature and 52.7°F (11.5°C) is the average low-temperature during September. The average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, in August is evaluated at 82.4°F (28°C).

What is the least humid month in Casselton?

September is the least humid month in Casselton, North Dakota, with an average relative humidity of 62%.

What is the average humidity in September in Casselton?

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

How many days does it rain in September in Casselton?

In Casselton, during September, the rain falls for 8.3 days and regularly aggregates up to 1.54" (39mm) of precipitation.

When it does not snow in Casselton?

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

Does it snow in Casselton in September?

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

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

In Casselton, North Dakota, the average day length in September is 12h and 32min.

What time are sunrise and sunset in September in Casselton?

In September, on the first day of the month, sunrise is at 6:49 am and sunset at 8:07 pm. On the last day of the month, in Casselton, sunrise is at 7:27 am and sunset at 7:09 pm CDT.

How long on average sun shines in September in Casselton?

In Casselton, the average sunshine duration in September is 8.8h.

What is the UV index reading in September in Casselton?

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
80.8°F 27.1°C
71.8°F 22.1°C
54°F 12.2°C
Average low temperature
59.5°F 15.3°C
52.7°F 11.5°C
40.5°F 4.7°C
Average pressure
29.92" 760mmHg
29.96" 761mmHg
29.96" 761mmHg
Average wind speed
8.1mph 13km/h
9.8mph 15.8km/h
10.8mph 17.4km/h
Average max. wind speed
8.8mph 14.2km/h
10.1mph 16.3km/h
11.6mph 18.7km/h
Average wind speed gusts
12.9mph 20.8km/h
15.2mph 24.5km/h
16.7mph 26.9km/h
Average humidity
63%
62%
66%
Average rainfall
1.69" 43mm
1.54" 39mm
1.93" 49mm
Average rainfall days
10.8
8.3
9.8
Average snowfall
0" 0mm
0" 0mm
0.39" 10mm
Average snowfall days
0
0
1.3
Average daylight
14h 1min
12h 3min
10h 5min
Average sunshine
10h 4min
8h 5min
5h 4min
Average sunshine days
18.1
19.8
19.1
Average UV index
5
4
2
Average cloud cover
24%
28%
39%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in September
Casselton, ND

Average temperature in September - Casselton, ND
  • Average high temperature in September: 71.8°F

The warmest months (with the highest average high temperature) are July and August (80.8°F).
The month with the lowest average high temperature is January (16.7°F).

  • Average low temperature in September: 52.7°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (3.2°F).

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Average pressure in September
Casselton, ND

Average pressure in September - Casselton, ND
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in September
Casselton, ND

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

The windiest month (with the highest average wind speed) is October (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.1mph).

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Average humidity in September
Casselton, ND

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

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is September (62%).

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Average rainfall in September
Casselton, ND

Average rainfall in September - Casselton, ND
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days in September
Casselton, ND

Average rainfall days in September - Casselton, ND
  • Average rainfall days in September: 8.3 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (1.9 days).

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Average snowfall in September
Casselton, ND

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

The month with the highest snowfall is December (3.74").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Casselton, ND

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

The month with the highest number of snowfall days is December (15.6 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
Casselton, ND

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

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 3h and 30min).

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Average sunshine days in September
Casselton, ND

Average sunshine days in September - Casselton, 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 June (11 days).

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Average UV index in September
Casselton, ND

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

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

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Average cloud cover in September
Casselton, ND

Average cloud cover in September - Casselton, ND
  • Average cloud cover in September: 28

The months with the most cloud cover are January and February (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 24).

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Average visibility in September
Casselton, ND

Average visibility in September - Casselton, 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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Casselton, North Dakota, USA

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