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
The arrival of September corresponds with a reduction in the average high-temperature, down from August's 83.8°F (28.8°C) to a still warm 74.5°F (23.6°C). In the month of September, Seneca witnesses a consistent average low-temperature of 54.5°F (12.5°C).Humidity
August and September, with an average relative humidity of 56%, are the least humid months.Rainfall
In Seneca, in September, it is raining for 8.5 days, with typically 1.06" (27mm) of accumulated precipitation. In Seneca, during the entire year, the rain falls for 97.8 days and collects up to 16.65" (423mm) of precipitation.Snowfall
June through September are months without snowfall in Seneca.Daylight
The average length of the day in September is 12h and 31min.On the first day of September in Seneca, 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 Seneca, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What is the temperature in September in Seneca?
What is the least humid month in Seneca?
What is the average humidity in September in Seneca?
How many days does it rain in September in Seneca?
When it does not snow in Seneca?
Does it snow in Seneca in September?
What is the average length of the day in September in Seneca?
When are sunrise and sunset in September in Seneca?
How long on average sun shines in September in Seneca?
How high is the UV index in September in Seneca?
Average temperature in September
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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
Seneca, 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).
Seneca, South Dakota, USA
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