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
Onaka's progression into September involves a drop in the average high-temperature, receding from 83.8°F (28.8°C) in August to a still moderately hot 74.5°F (23.6°C). Throughout September, Onaka encounters an average temperature drop to a fresh 54.5°F (12.5°C).Humidity
August and September, with an average relative humidity of 56%, are the least humid months.Rainfall
In Onaka, in September, it is raining for 8.5 days, with typically 1.06" (27mm) of accumulated precipitation. Throughout the year, in Onaka, South Dakota, there are 97.8 rainfall days, and 16.65" (423mm) of precipitation is accumulated.Snowfall
In Onaka, South Dakota, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 7:00 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:19 pm CDT.
Sunshine
In September, the average sunshine in Onaka is 8.6h.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 exposure to the Sun's UV radiation for ordinary individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
What are the temperatures in Onaka in September?
What is the least humid month in Onaka?
What is the average humidity in September in Onaka?
How many days does it rain in September in Onaka?
When it does not snow in Onaka?
Does it snow in Onaka in September?
How many hours of daylight does Onaka have in September?
When is the sunrise / sunset in September in Onaka?
How many hours of sunshine does Onaka have in September?
What is the UV index intensity in September in Onaka?
Average temperature in September
Onaka, SD
- Average high temperature in September: 74.5°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (22.6°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (9.1°F).
Average pressure in September
Onaka, SD
- Average pressure in September: 29.95"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Onaka, SD
- Average wind speed in September: 11.1mph
The windiest month (with the highest average wind speed) is April (11.8mph).
The calmest month (with the lowest average wind speed) is August (9.7mph).
Average humidity in September
Onaka, SD
- Average humidity in September: 56%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are August and September (56%).
Average rainfall in September
Onaka, SD
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Onaka, SD
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is June (14.4 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in September
Onaka, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.04").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Onaka, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Onaka, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Onaka, SD
- Average sunshine days in September: 19.6 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in September
Onaka, 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 1).
Average cloud cover in September
Onaka, SD
- Average cloud cover in September: 25
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are July and August (Cloud cover 22).
Average visibility in September
Onaka, 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).
Onaka, South Dakota, USA
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