Records for San Diego Area, California (SANthr) on 09-21
  Record Highs
  
    - 
      1:  106°F (1939)
    
- 
      2:  91°F (1883)
    
- 
      3:  90°F (1885)
    
 
  Record Lows
  
    - 
      1:  53°F (1997)
    
- 
      2:  53°F (1893)
    
- 
      3:  55°F (1954)
    
 
  Lowest Highs
  
    - 
      1:  76°F (1939)
    
- 
      2:  75°F (2015)
    
- 
      3:  74°F (1983)
    
 
  Highest Lows
  
    - 
      1:  66°F (2010)
    
- 
      2:  66°F (1933)
    
- 
      3:  66°F (1909)
    
 
  Highest September temperature:
  
  111°F on 09-26-1963.
  Lowest September temperature:
  
  50°F on 09-18-1882.
  Average temperature is 71.3°F
  Average high is 76.8°F
  Average low is 65.7°F
 
  Temperature data from 1874 to 2022.
  Record Precipitation
  
    - 
      1:  0.16" (2016)
    
- 
      2:  0.07" (1947)
    
- 
      3:  0.01" (1999)
    
 
  Precipitation data from 1850 to 2022.