September weather forecastRedfield, SD
September
Weather in September
September is when the autumn season settles in, offering a noticeable change in weather conditions after the hot summer months. Precipitation levels fall to a moderate 1.1" (28mm), down from August. The decrease in temperature is welcomed, as the days feel more pleasant and less intense. With the change in season, fall foliage begins to appear, adding a touch of color to Redfield's landscape. The days gradually grow shorter, foreshadowing the approaching winter.Temperature
The transition into September subtly indicates a reduction in the average high-temperature, down to a still moderately hot 75.9°F (24.4°C) from August's 84.4°F (29.1°C). Redfield's average low-temperature during September nights is observed to be a fresh 54.5°F (12.5°C).Humidity
With an average relative humidity of 60%, September is the least humid month.Rainfall
In Redfield, during September, the rain falls for 9.3 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, there are 97.6 rainfall days, and 17.83" (453mm) of precipitation is accumulated.Snowfall
In Redfield, snow does not fall in May through September.Daylight
In Redfield, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:57 am and sunset at 8:10 pm. On the last day of September, sunrise is at 7:31 am and sunset at 7:15 pm CDT.
Sunshine
In Redfield, the average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Undertake precautions - It is suggested to shield oneself from sunburn. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Redfield, SD
- Average high temperature in September: 75.9°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 (22.5°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).
Average pressure in September
Redfield, 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 (29.84"Hg).
Average wind speed in September
Redfield, SD
- Average wind speed in September: 9.7mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).
Average humidity in September
Redfield, SD
- Average humidity in September: 60%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is September (60%).
Average rainfall in September
Redfield, SD
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is June (3.03").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in September
Redfield, SD
- Average rainfall days in September: 9.3 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in September
Redfield, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.09").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Redfield, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Redfield, SD
- Average daylight in September: 12h and 30min
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: 8h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Redfield, SD
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (12.2 days).
Average UV index in September
Redfield, 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 and February (UV index 1).
Average cloud cover in September
Redfield, SD
- Average cloud cover in September: 25
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 22).
Average visibility in September
Redfield, 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).
