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Weather in September in Key West, Florida

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< September >
 
Normal Max/ High Temperature 31°C (88°F)
 
Average Temperature 29°C (83°F)
 
Min/ Low Temperature 26°C (78°F)
 
Normal Precipitation 149mm (5.9in)
Number of Wet Days (probability of rain on a day) 16 (53%)
Average Sunlight per day 07:32
Average Daylight per day 12:15
Sunny (Cloudy) Daylight Hours 62% (38%)
Sun altitude at solar noon on the 21st day.
65.9°


  • The average temperature in Key West, Florida in September is very hot at 28.5 °C (83.3 °F).
  • Afternoons can be very hot with average high temperatures reaching 31.1 °C (88 °F).
  • Overnight temperatures are generally hot with an average low of 25.8 °C (78.4 °F).
  • In September the mean daily temperature variation/ range is 5.3 °C (9.5 °F).
  • The weather in September is very faintly moist with rain sometimes. Some 148.6mm (5.9in) of fluid is discharged across an average of 16 days.
  • The heavens above Key West, Florida are slightly sunny having on balance a welcome 7:32 of magnificent solar radiation daily.
  • The shortest day is 11:54 long and the longest day is 12:36 long with an average length of 12:15.
  • There are approximately 4:35 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 62.2% of daylight hours and cloudy 37.8% of daylight hours.

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Weather Trend Graph for September in Key West, Florida, Usa

Graph of weather in Key West, Florida in September

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