031
CXUS56 KMTR 010844
CLMSFO

CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
144 AM PDT WED OCT 01 2025

...................................

...THE SAN FRANCISCO AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1927 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH            104   09/02/2017
                       09/01/2017
 LOW              41   09/30/1950
HIGHEST           91   09/23                          87  09/30
LOWEST            57   09/01                         -28  09/14
                       09/17
                       09/27
                                                          09/08
                                                          09/12
AVG. MAXIMUM    74.4               74.8    -0.4     71.9
AVG. MINIMUM    60.3                                51.3
MEAN            67.4               65.3     2.1     61.6
DAYS MAX >= 90     1                                   0
DAYS MAX <= 32     0                                   0
DAYS MIN <= 32     0                                   1
DAYS MIN <= 0      0                                   1

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        2.30   1959
 MINIMUM        0.00   2024
TOTALS          0.07               0.07    0.00     0.00
DAILY AVG.      0.00               0.00   -0.00     0.00
DAYS >= .01        3                                   0
DAYS >= .10        0                                   0
DAYS >= .50        0                                   0
DAYS >= 1.00       0                                   0
GREATEST
 24 HR. TOTAL   0.04   09/09 TO 09/09               0.00  08/31 TO 08/31


DEGREE DAYS
HEATING TOTAL      3                 46     -43      117
 SINCE 7/1        93                146     -53       MM
COOLING TOTAL     78                 56      22       24
 SINCE 1/1       128                166     -38       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              10.7
RESULTANT WIND SPEED/DIRECTION   8/280
HIGHEST WIND SPEED/DIRECTION    30/210    DATE  09/02
HIGHEST GUST SPEED/DIRECTION    38/200    DATE  09/02

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.52
NUMBER OF DAYS FAIR            9
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     74

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                4     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      17     FOG W/VIS <= 1/4 MILE      0
HAZE                     22

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$