San Francisco Weather In September
In the last 83 years the highest measured September temperature in San Francisco was 103 degrees Fahrenheit, registered on September 14, 1971, and the normal high is 73. The coldest day reported in San Francisco in September for the past 83 years was 41 on September 30, 1950, while the average low temperature is 55.
United States National Weather Service historical San Francisco September weather data indicates that on September 16, 1989, the measured high temperature did not exceed 59 degrees Fahrenheit, the lowest high measured in San Francisco in the past 83 years. The Weather Service additionally shows that on September 7, 1958, the low for the day did not drop below 67 degrees, the highest low temperature in San Francisco in the last 83 years.
National Weather Service records indicate that the high temperature in San Francisco on September First averages 67 degrees and the high on the last day of the month averages 64 degrees. The daily low temperature in San Francisco on September First averages 50 degrees Fahrenheit and the low on the last day of September averages 48 degrees.
San Francisco normally receives an average of 0.2 inches of rain during September. The most precipitation recorded on a single day in September, according to September San Francisco Weather data, was 2.29 inches on September 18, 1959.