September weather forecast
Saint John, ND

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Weather in September

September, the first month of the autumn in Saint John, is also an enjoyable month, with an average temperature ranging between min 49.1°F (9.5°C) and max 67.6°F (19.8°C).

Temperature

The onset of September is marked by a decrease in temperature, transitioning from a warm 77.9°F (25.5°C) in August to a refreshing 67.6°F (19.8°C). Saint John observes an average nighttime low-temperature of 49.1°F (9.5°C) during the month of September.

Humidity

In September, the average relative humidity is 62%.

Rainfall

In September, the rain falls for 11.3 days. Throughout September, 2.01" (51mm) of precipitation is accumulated. Throughout the year, there are 110.9 rainfall days, and 17.95" (456mm) of precipitation is accumulated.

Snowfall

In Saint John, snow does not fall in June through September.

Daylight

The average length of the day in September is 12h and 34min.
On the first day of September, sunrise is at 6:56 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 7:18 pm CDT.

Sunshine

In September, the average sunshine is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: A daily high UV index of 4 in September leads to these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Updated: Jul 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The high-temperature, in September, in Saint John, records 67.6°F (19.8°C), while the low-temperature is 49.1°F (9.5°C).

What is the average humidity in September?

In September, the average relative humidity is 62%.

How much does it rain in September?

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

When it does not snow?

June through September are months without snowfall.

Does it snow in Saint John in September?

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

What is the average length of the day in September?

In Saint John, the average day length in September is 12h and 34min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:56 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 7:18 pm CDT.

How many hours of sunshine does Saint John have in September?

In Saint John, the average sunshine duration in September is 8.5h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe 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
Saint John, ND

Average temperature in September - Saint John, 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).

Average pressure in September
Saint John, ND

Average pressure in September - Saint John, ND
  • Average pressure in September: 29.95"Hg

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

Average wind speed in September
Saint John, ND

Average wind speed in September - Saint John, 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).

Average humidity in September
Saint John, ND

Average humidity in September - Saint John, 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%).

Average rainfall in September
Saint John, ND

Average rainfall in September - Saint John, 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").

Average rainfall days in September
Saint John, ND

Average rainfall days in September - Saint John, 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).

Average snowfall in September
Saint John, ND

Average snowfall in September - Saint John, ND
  • Average snowfall in September: 0"

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

Average snowfall days in September
Saint John, ND

Average snowfall days in September - Saint John, ND
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (15.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Saint John, ND

Average daylight in September / Average sunshine in September - Saint John, ND
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).

Average sunshine days in September
Saint John, ND

Average sunshine days in September - Saint John, 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).

Average UV index in September
Saint John, ND

Average UV index in September - Saint John, ND
  • Average UV index in September: 4

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

Average cloud cover in September
Saint John, ND

Average cloud cover in September - Saint John, 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).

Average visibility in September
Saint John, ND

Average visibility in September - Saint John, 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).

Saint John, North Dakota, USA

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