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
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from a moderately hot 82.6°F (28.1°C) to a still warm 73.8°F (23.2°C). An average low-temperature of 53.4°F (11.9°C) marks the nights throughout September.Humidity
August and September, with an average relative humidity of 49%, are the least humid months in Union Center.Rainfall
In September, the rain falls for 9 days. Throughout September, 0.83" (21mm) of precipitation is accumulated. Throughout the year, in Union Center, there are 126.3 rainfall days, and 16.77" (426mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Union Center. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Union Center, during the entire year, snow falls for 62.1 days and aggregates up to 36.26" (921mm) of snow.Daylight
In September, the average length of the day in Union Center is 12h and 30min.On the first day of the month, sunrise is at 6:14 am and sunset at 7:26 pm. On the last day of September, in Union Center, sunrise is at 6:48 am and sunset at 6:32 pm MDT.
Sunshine
In September, the average sunshine is 10.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: An average UV index of 4 in September transforms into this advice:
Put precautions into practice - Ensuring skin and eye safety is a necessity. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. To cut down UV radiation exposure by about half, sport a wide-brim hat. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Frequently asked questions
What are September temperatures in Union Center?
What are the least humid months in Union Center?
What is the average humidity in September in Union Center?
How much does it rain in Union Center in September?
When does it start to snow in Union Center?
What is the average length of the day in September in Union Center?
When are sunrise and sunset in September in Union Center?
How long on average sun shines in September in Union Center?
What is the UV index reading in September in Union Center?
Average temperature in September
Union Center, SD
- Average high temperature in September: 73.8°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (32.2°F).
- Average low temperature in September: 53.4°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).
Average pressure in September
Union Center, SD
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Union Center, SD
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is October (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (8.3mph).
Average humidity in September
Union Center, SD
- Average humidity in September: 49%
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are August and September (49%).
Average rainfall in September
Union Center, SD
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (2.52").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
Union Center, SD
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is December (5.8 days).
Average snowfall in September
Union Center, SD
- Average snowfall in September: 0.04"
The month with the highest snowfall is April (8.23").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Union Center, SD
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (12.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Union Center, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in September
Union Center, SD
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (9.4 days).
Average UV index in September
Union Center, SD
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Union Center, SD
- Average cloud cover in September: 18
The months with the most cloud cover are February and April (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Union Center, SD
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Union Center, South Dakota, USA
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