Key West Weather In September
The hottest September day in Key West for the past 58 years was 95 degrees Fahrenheit, registered on September 3, 2007, while the normal high temperature is 88. The lowest documented temperature for Key West for the past 58 years in September was 69 measured on September 17, 1985, while the standard low daily temperature for the month is 78.
United States National Weather Service historical Key West September weather data indicates that on September 29, 1994, the measured high temperature did not exceed 79 degrees Fahrenheit, the lowest high measured in Key West in the past 58 years. NWS data also shows that on September 19, 2003, the lowest measured temperature on that day did not drop below 85 degrees, the highest low temperature measured in Key West in the last 58 years.
Historical weather data accumulated by the National Weather Service shows that the average daily high temperature in Key West on September First is 89 degrees Fahrenheit and the average high on the last day of September is 87 degrees. The low temperature in Key West in September on the first day of the month averages 79 degrees and the low temperature on the last day of the month averages 78 degrees.
Key West normally receives an average of 5.45 inches of rain during September. The most rain recorded in a single day, as shown by September Key West Weather data, was 6.06 inches on September 21, 1948.