September weather forecastRolla, ND
September
Weather in September
September experiences a noticeable shift from summer to autumn in Rolla, North Dakota. Temperatures start to decline from the summer highs yet the weather remains comfortably warm. It serves as a transitional period, with falling temperatures making the weather bearable. The slight dip in sunlight hours and the onset of the first snowfall towards the end of the month signify the approach of cooler months. Although September signals the end of the warm season, the retreat is gradual and not drastically felt.Temperature
September implies a gentle temperature shift, with average high-temperatures reducing from August's warm 77.9°F (25.5°C) to a refreshing 67.6°F (19.8°C). An average low-temperature of 49.1°F (9.5°C) marks the month of September.Humidity
In September, the average relative humidity is 62%.Rainfall
In Rolla, during September, the rain falls for 11.3 days and regularly aggregates up to 2.01" (51mm) of precipitation. Throughout the year, there are 110.9 rainfall days, and 17.95" (456mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Rolla.Daylight
In September, the average length of the day is 12h and 34min.On the first day of the month, sunrise is at 6:56 am and sunset at 8:20 pm. On the last day of September, sunrise is at 7:37 am and sunset at 7:18 pm CDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum UV index of 4 in September translates into the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. 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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in September
Rolla, 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
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).
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%).
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").
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).
Average snowfall in September
Rolla, 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
Rolla, 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
Rolla, ND
- Average daylight in September: 12h and 36min
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 30min
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
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).
Average UV index in September
Rolla, 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
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).
Average visibility in September
Rolla, 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).
