September weather forecastGrafton, ND
September
Weather in September
September in Grafton ushers in the autumnal transition, shedding the summer heat for milder temperatures. The leaves start changing color, painting the city in shades of orange and brown. Despite the transition, rainfall remains significant at 1.81" (46mm). The pleasant weather and colorful spectacle of Fall make September particularly attractive for photography and outdoor leisure.Temperature
The commencement of September involves a temperature shift, with the average high-temperature dropping from a warm 80.4°F (26.9°C) in August to a pleasant 70.5°F (21.4°C). Grafton records an average temperature drop to a fresh 51.6°F (10.9°C) in September.Humidity
In September, the average relative humidity is 61%.Rainfall
In Grafton, in September, it is raining for 8.7 days, with typically 1.81" (46mm) of accumulated precipitation. Throughout the year, in Grafton, there are 97.8 rainfall days, and 15.83" (402mm) of precipitation is accumulated.Snowfall
In Grafton, 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 in Grafton, North Dakota, sunrise is at 6:48 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:10 pm CDT.
Sunshine
The average sunshine in September in Grafton is 8.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grafton, ND
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is August (80.4°F).
The month with the lowest average high temperature is January (14.7°F).
- Average low temperature in September: 51.6°F
The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is January (0.9°F).
Average pressure in September
Grafton, ND
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Grafton, ND
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is October (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (8.1mph).
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: 1.81"
The wettest month (with the highest rainfall) is June (2.8").
The driest months (with the least rainfall) are January and February (0.55").
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: 0"
The month with the highest snowfall is December (3.94").
The months with the least snowfall are June, July, August and September (0").
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).
The 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: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 8h and 42min
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 12min).
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).
The 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: 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).
