Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September ushers in a slight temperature change, with average high-temperatures reducing from August's warm 81.1°F (27.3°C) to an agreeable 70.7°F (21.5°C). Riverdale Junction's nighttime temperature in September falls to an average of 51.3°F (10.7°C).Humidity
The average relative humidity in September is 56%.Rainfall
In Riverdale Junction, during September, the rain falls for 9 days and regularly aggregates up to 2.05" (52mm) of precipitation. In Riverdale Junction, during the entire year, the rain falls for 95.9 days and collects up to 14.65" (372mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Riverdale Junction, the average length of the day in September is 12h and 33min.On the first day of September, sunrise is at 7:04 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 7:25 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The UV index of 4 during September leads to these advisories:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Riverdale Junction have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Riverdale Junction have in September?
What is the UV index reading in September?
Average temperature in September
Riverdale Junction, ND
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (19.6°F).
- Average low temperature in September: 51.3°F
The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in September
Riverdale Junction, ND
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Riverdale Junction, ND
- Average wind speed in September: 10mph
The windiest month (with the highest average wind speed) is October (11mph).
The calmest month (with the lowest average wind speed) is August (8.6mph).
Average humidity in September
Riverdale Junction, ND
- Average humidity in September: 56%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (54%).
Average rainfall in September
Riverdale Junction, ND
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is June (2.64").
The driest month (with the least rainfall) is February (0.39").
Average rainfall days in September
Riverdale Junction, ND
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is June (13.9 days).
The month with the least rainy days is February (2.1 days).
Average snowfall in September
Riverdale Junction, ND
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Riverdale Junction, ND
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Riverdale Junction, ND
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 18min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in September
Riverdale Junction, 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 March (13.9 days).
Average UV index in September
Riverdale Junction, 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 December (UV index 1).
Average cloud cover in September
Riverdale Junction, ND
- Average cloud cover in September: 26
The month with the most cloud cover is February (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 22).
Average visibility in September
Riverdale Junction, 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).
Riverdale Junction, North Dakota, USA
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