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 is marked by a minor reduction in average high-temperature, sliding from 85.6°F (29.8°C) in August to a still warm 77°F (25°C). During September, Rockyford consistently records a temperature low averaging a moderate 55.9°F (13.3°C).Humidity
The average relative humidity in September is 49%.Rainfall
In Rockyford, during September, the rain falls for 6.1 days and regularly aggregates up to 1.02" (26mm) of precipitation. In Rockyford, during the entire year, the rain falls for 86.7 days and collects up to 13.66" (347mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Rockyford, during the entire year, snow falls for 47.4 days and aggregates up to 22.72" (577mm) of snow.Daylight
In Rockyford, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:14 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:32 pm MDT.
Sunshine
In Rockyford, the average sunshine in September is 10.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Around midday, solar radiation is most harmful; hence, exposure should be limited. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
What are September temperatures in Rockyford?
What is the average humidity in September in Rockyford?
How many days does it rain in September in Rockyford?
When does it start to snow in Rockyford?
How many hours of daylight does Rockyford have in September?
What time are sunrise and sunset in September in Rockyford?
How many hours of sunshine does Rockyford have in September?
What is the UV index reading in September in Rockyford?
Average temperature in September
Rockyford, SD
- Average high temperature in September: 77°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is December (32.4°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).
Average pressure in September
Rockyford, SD
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Rockyford, SD
- Average wind speed in September: 11.2mph
The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest month (with the lowest average wind speed) is August (10.2mph).
Average humidity in September
Rockyford, SD
- Average humidity in September: 49%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (48%).
Average rainfall in September
Rockyford, SD
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Rockyford, SD
- Average rainfall days in September: 6.1 days
The month with the highest number of rainy days is May (13.1 days).
The months with the least rainy days are February and December (2.5 days).
Average snowfall in September
Rockyford, SD
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (4.02").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Rockyford, SD
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (11.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Rockyford, SD
- Average daylight in September: 12h and 3min
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: 10h and 1min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in September
Rockyford, SD
- Average sunshine days in September: 22.8 days
The month with the most sunshine days is September (22.8 days).
The month with the least sunshine days is April (13.2 days).
Average UV index in September
Rockyford, SD
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Rockyford, SD
- Average cloud cover in September: 19
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Rockyford, 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).
Rockyford, South Dakota, USA
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