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
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a moderately hot 84.6°F (29.2°C) in August to a still warm 75.7°F (24.3°C). Mission witnesses a consistent average low-temperature of 55.8°F (13.2°C) throughout September.Humidity
The least humid month in Mission, South Dakota, is September, with an average relative humidity of 56%.Rainfall
In Mission, in September, during 10.2 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, there are 109.2 rainfall days, and 16.89" (429mm) of precipitation is accumulated.Snowfall
Months with snowfall in Mission are January through May, September through December. September is the first month it typically snows in Mission, South Dakota. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5mm) of snow. In Mission, South Dakota, during the entire year, snow falls for 41.1 days and aggregates up to 14.53" (369mm) of snow.Daylight
The average length of the day in September in Mission is 12h and 29min.On the first day of September in Mission, sunrise is at 7:07 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 7:24 pm CDT.
Sunshine
In September, the average sunshine in Mission is 9.1h.UV index
In September, the average daily maximum UV index in Mission is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Be vigilant - Suggestions to stave off sun damage are provided. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Frequently asked questions
What is the average September temperature in Mission?
What is the least humid month in Mission?
What is the average humidity in September in Mission?
How much does it rain in Mission in September?
When does it start snowing in Mission?
How many hours of daylight does Mission have in September?
What time are sunrise and sunset in September in Mission?
How long on average sun shines in September in Mission?
How high is the UV index in September in Mission?
Average temperature in September
Mission, SD
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in September
Mission, SD
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Mission, SD
- Average wind speed in September: 11.7mph
The windiest month (with the highest average wind speed) is April (13.1mph).
The calmest months (with the lowest average wind speed) are July and August (10.6mph).
Average humidity in September
Mission, SD
- Average humidity in September: 56%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is September (56%).
Average rainfall in September
Mission, SD
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Mission, SD
- Average rainfall days in September: 10.2 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is January (2.4 days).
Average snowfall in September
Mission, SD
- Average snowfall in September: 0.2"
The month with the highest snowfall is December (2.76").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Mission, SD
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Mission, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Mission, SD
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in September
Mission, SD
- Average UV index in September: 5
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
Mission, SD
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 44).
The months with the least cloud cover are July, August and September (Cloud cover 21).
Average visibility in September
Mission, 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).
Mission, South Dakota, USA
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