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Weather in September in Rapid City, South Dakota

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< September >
 
Normal Max/ High Temperature 23°C (73°F)
 
Average Temperature 15°C (59°F)
 
Min/ Low Temperature 7°C (45°F)
 
Normal Precipitation 31mm (1.2in)
Number of Wet Days (probability of rain on a day) 6 (20%)
Average Sunlight per day 08:36
Average Daylight per day 12:27
Sunny (Cloudy) Daylight Hours 70% (30%)
Sun altitude at solar noon on the 21st day.
46.4°


  • The average temperature in Rapid City, South Dakota in September is mild at 15 °C (59 °F).
  • Afternoons can be really warm with average high temperatures reaching 22.9 °C (73.2 °F).
  • Overnight temperatures are generally a little cool with an average low of 7 °C (44.6 °F).
  • The variation/ range of diurnal mean temperatures in September is 15.9 °C (28.6 °F).
  • The weather in September is dry with periodic rain. A mere 31.2mm (1.2in) of water is unloaded during on average 6 days.
  • In September the heavens above Rapid City, South Dakota are quite sunny with on balance a respectable 8:36 of blazing sunlight per day.
  • The shortest day is 11:42 long and the longest day is 13:12 long with an average length of 12:27.
  • There are approximately 3:40 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 70.1% of daylight hours and cloudy 29.9% of daylight hours.

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Weather Trend Graph for September in Rapid City, South Dakota, Usa

Graph of weather in Rapid City, South Dakota in September

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