Climatological Report (Monthly)
Issued by NWS
Issued by NWS
815
CXUS56 KMTR 010844
CLMSJC
CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
144 AM PDT WED OCT 01 2025
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...THE SAN JOSE AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1893 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 109 09/06/2022
LOW 35 09/23/1903
09/30/1893
HIGHEST 95 09/23 95 09/03
09/23
09/30
LOWEST 59 09/03 56 09/17
09/30
AVG. MAXIMUM 81.3 80.7 0.6 84.0
AVG. MINIMUM 62.2 57.2 5.0 59.7
MEAN 71.8 71.9
DAYS MAX >= 90 3 9
DAYS MAX <= 32 0 0
DAYS MIN <= 32 0 0
DAYS MIN <= 0 0 0
PRECIPITATION (INCHES)
TOTALS 0.44 0.07 0.37 0.00
DAILY AVG. 0.01 0.00 0.01 0.00
DAYS >= .01 2 0
DAYS >= .10 1 0
DAYS >= .50 0 0
DAYS >= 1.00 0 0
GREATEST
24 HR. TOTAL 0.41 09/10 TO 09/10 0.00 08/31 TO 08/31
DEGREE DAYS
HEATING TOTAL 0 12 -12 0
SINCE 7/1 1 14 -13 MM
COOLING TOTAL 210 130 80 213
SINCE 1/1 559 573 -14 MM
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WIND (MPH)
AVERAGE WIND SPEED 6.7
RESULTANT WIND SPEED/DIRECTION 2/310
HIGHEST WIND SPEED/DIRECTION 24/200 DATE 09/27
HIGHEST GUST SPEED/DIRECTION 36/200 DATE 09/27
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.41
NUMBER OF DAYS FAIR 13
NUMBER OF DAYS PC 14
NUMBER OF DAYS CLOUDY 3
AVERAGE RH (PERCENT) 65
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 1
LIGHT RAIN 3 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 1 FOG W/VIS <= 1/4 MILE 0
HAZE 3
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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