September weather forecast and climate
Grafton, ND

September, the first month of the autumn, in Grafton, is also an agreeable month, with average temperature fluctuating between 70.5°F (21.4°C) and 51.6°F (10.9°C).

Temperature

In Grafton, the average high-temperature drops, from a warm 80.4°F (26.9°C) in August, to an agreeable 70.5°F (21.4°C). In Grafton, in September, the average low-temperature is 51.6°F (10.9°C).

Humidity

In September, the average relative humidity in Grafton is 61%.

Rainfall

In Grafton, North Dakota, in September, during 8.7 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. Throughout the year, there are 97.8 rainfall days, and 15.83" (402mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Grafton.

Daylight

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

Sunshine

The average sunshine in Grafton is 8.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Grafton?

In September, the average high-temperature is 70.5°F (21.4°C), and the average low-temperature is 51.6°F (10.9°C).

What is the average humidity in September in Grafton?

In September, the average relative humidity is 61%.

How much does it rain in Grafton in September?

In Grafton, in September, during 8.7 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.

Does it snow in Grafton in September?

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

When it does not snow in Grafton?

In Grafton snow does not fall in June through September.

How many hours of daylight does Grafton have in September?

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

How many hours of sunshine does Grafton have in September?

In Grafton, the average sunshine in September is 8.7h.

What is the UV index intensity in September in Grafton?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Grafton, ND
  • Average high temperature in September: 21.4°C

The warmest month (with the highest average high temperature) is August (26.9°C).
The month with the lowest average high temperature is January (-9.6°C).

  • Average low temperature in September: 10.9°C

The month with the highest average low temperature is July (15.5°C).
The coldest month (with the lowest average low temperature) is January (-17.3°C).

Average pressure in September - Grafton, ND
  • Average pressure in September: 1014.3mbar

The month with the highest atmospheric pressure is February (1021.5mbar).
The month with the lowest atmospheric pressure is June (1010.9mbar).

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

The windiest month (with the highest average wind speed) is October (17km/h).
The calmest months (with the lowest average wind speed) are July and August (13.1km/h).

Average humidity in September - Grafton, ND
  • Average humidity in September: 61%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (59%).

Average rainfall in September - Grafton, ND
  • Average rainfall in September: 46mm

The wettest month (with the highest rainfall) is June (71mm).
The driest months (with the least rainfall) are January and February (14mm).

Average rainfall days in September - Grafton, ND
  • Average rainfall days in September: 8.7 days

The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is February (1.6 days).

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

The month with the highest snowfall is December (100mm).
Months with the least snowfall are June, July, August and September (0mm).

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

The month with the highest number of snowfall days is January (14.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in September: 8.7h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is January (Average sunshine: 3.2h).

Average sunshine days in September - Grafton, ND
  • Average sunshine days in September: 19.5 days

The month with the most sunshine days is August (19.8 days).
The month with the least sunshine days is June (11.5 days).

Average UV index in September - Grafton, 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, February and November (UV index 1).

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

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 24).

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

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