964  
CDUS46 KSGX 180018  
CLIONT  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SAN DIEGO, CA  
518 PM PDT WED SEP 17 2025  
   
...............................
 
 
...THE ONTARIO INTL AIRPORT CA CLIMATE SUMMARY FOR SEPTEMBER 17 2025...  
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1998 TO 2025  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 97 1:09 PM 102 2000 91 6 76  
2020  
MINIMUM 72 4:57 AM 55 2010 64 8 55  
2024  
AVERAGE 85 78 7 66  
 
PRECIPITATION (IN)  
TODAY 0.00 T 2023 0.00 0.00 0.00  
MONTH TO DATE 0.00 0.04 -0.04 T  
SINCE JUL 1 T 0.12 -0.12 T  
SINCE OCT 1 6.22 11.58 -5.36 17.64  
SINCE JAN 1 6.07 8.48 -2.41 16.29  
 
DEGREE DAYS  
HEATING  
TODAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE SEP 1 0 0 0 0  
SINCE JUL 1 0 0 0 0  
 
COOLING  
TODAY 20 13 7 1  
MONTH TO DATE 254 238 16 287  
SINCE SEP 1 254 238 16 287  
SINCE JAN 1 1643 1611 32 1661    
...............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 4 RESULTANT WIND DIRECTION W (260)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION SW (230)  
AVERAGE WIND SPEED 5.1  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 51 5:00 AM  
LOWEST 27 12:00 PM  
AVERAGE 39  
   
......................................................
 
 
THE ONTARIO INTL AIRPORT CA CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 91 106 2016  
MINIMUM TEMPERATURE (F) 64 55 2010  
 
SUNRISE AND SUNSET  
SEPTEMBER 17 2025.....SUNRISE 6:35 AM PDT SUNSET 6:54 PM PDT  
SEPTEMBER 18 2025.....SUNRISE 6:36 AM PDT SUNSET 6:52 PM PDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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