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Weather in September in Saint Louis, Missouri

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< September >
 
Normal Max/ High Temperature 27°C (81°F)
 
Average Temperature 21°C (69°F)
 
Min/ Low Temperature 14°C (57°F)
 
Normal Precipitation 71mm (2.8in)
Number of Wet Days (probability of rain on a day) 7 (23%)
Average Sunlight per day 08:25
Average Daylight per day 12:23
Sunny (Cloudy) Daylight Hours 69% (31%)
Sun altitude at solar noon on the 21st day.
51.8°


  • The average temperature in Saint Louis, Missouri in September is warm at 20.5 °C (68.9 °F).
  • Afternoons can be hot with average high temperatures reaching 27 °C (80.6 °F).
  • Overnight temperatures are generally mild with an average low of 14 °C (57.2 °F).
  • The range/ variation of daily mean temperatures in September is 13 °C (23.4 °F).
  • The weather in September is somewhat dry with sporadic rain. Just 71mm (2.8in) of liquid accrues across an average of 7 days.
  • The skies in Saint Louis, Missouri are moderately sunny with on average a respectable 8:25 of radiant solar radiation daily.
  • The shortest day is 11:46 long and the longest day is 13:00 long with an average length of 12:23.
  • There are approximately 3:48 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 68.8% of daylight hours and cloudy 31.2% of daylight hours.

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Weather Trend Graph for September in Saint Louis, Missouri, Usa

Graph of weather in Saint Louis, Missouri in September

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