September weather forecastSpencer, SD
September
Weather in September
September, the first month of the autumn in Spencer, is also a moderately hot month, with an average temperature varying between 55°F (12.8°C) and 76.1°F (24.5°C).Temperature
During the shift to September, Spencer records a mild decrease in average high-temperature, moving from 84.4°F (29.1°C) in August to a still warm 76.1°F (24.5°C). Spencer records a steady low-temperature average of 55°F (12.8°C) during September.Humidity
September and October, with an average relative humidity of 63%, are the least humid months.Rainfall
In Spencer, during September, the rain falls for 9.2 days and regularly aggregates up to 1.18" (30mm) of precipitation. In Spencer, during the entire year, the rain falls for 93.2 days and collects up to 11.3" (287mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 29min.On the first day of September, sunrise is at 6:54 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:12 pm CDT.
Sunshine
The average sunshine in September is 8.9h.UV index
In Spencer, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 5 in September translates into this advice:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. To protect against the Sun's most potent rays, avoid direct exposure around midday. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Spencer, SD
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (24.4°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (10.2°F).
Average pressure in September
Spencer, SD
- Average pressure in September: 29.96"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Spencer, SD
- Average wind speed in September: 9.7mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).
Average humidity in September
Spencer, SD
- Average humidity in September: 63%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are September and October (63%).
Average rainfall in September
Spencer, SD
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is May (1.65").
The driest months (with the least rainfall) are February and November (0.28").
Average rainfall days in September
Spencer, SD
- Average rainfall days in September: 9.2 days
The month with the highest number of rainy days is June (13.6 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in September
Spencer, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Spencer, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Spencer, SD
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
Spencer, SD
- Average sunshine days in September: 18.3 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (12.8 days).
Average UV index in September
Spencer, SD
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Spencer, SD
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 22).
Average visibility in September
Spencer, SD
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
