Temperatures Precipitation Sun/ Daylight Humidity Graphs Map Comparisons Forecast Hotels January February March April May June July August September October November December Weather in September in Saint Louis, Missouri

• 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

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