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FPUS86 KSGX 011843
OPUSAN

SEPTEMBER WEATHER IN SAN DIEGO

NATIONAL WEATHER SERVICE RECORDS SINCE 1872 SHOW THAT ABOUT ONE
THIRD OF THE TOTAL NUMBER OF DAYS WITH A TEMPERATURE OF 90
DEGREES OR HIGHER IN SAN DIEGO OCCURRED IN SEPTEMBER...FOR AN
AVERAGE OF ABOUT ONE EACH YEAR.  THESE HIGH READINGS WERE ALMOST
INVARIABLY ACCOMPANIED BY HOT...DRY EASTERLY WINDS IN THE COUNTY
KNOWN AS SANTA ANAS.  IT WAS DURING ONE OF THESE OCCURRENCES THAT
THE ALL TIME HIGH OF 111 DEGREES WAS RECORDED ON SEPTEMBER 26...1963.
HOWEVER...MONTHLY AVERAGES HAVE BEEN CHANGED LITTLE BY THE OCCASIONAL
HOT DAYS...AND THE NORMAL MAXIMUM IS ONLY 75.9 DEGREES...THE NORMAL
LOW 65.2 DEGREES AND THE MONTHLY NORMAL 70.6 DEGREES.
THE LOWEST RECORDED WAS 50 DEGREES IN 1907.

OUR DRY SEASON CONTINUES THROUGH SEPTEMBER AND IN MORE THAN HALF
OF THE YEARS NO MEASURABLE AMOUNTS OF RAIN WERE RECORDED DURING
THE MONTH.  THE NORMAL RAINFALL IS 0.15 INCH WITH THE GREATEST
MONTHLY TOTAL 3.14 INCHES IN 1939.

SEPTEMBER IS NORMALLY THE HEIGHT OF THE HURRICANE SEASON IN THE
EASTERN PACIFIC AND IS THE MONTH THAT DISSIPATING MAJOR TROPICAL
STORMS HAVE COME THROUGH SAN DIEGO.  THREE OF THE LAST FIVE TROPICAL
STORMS THAT CAME THROUGH SAN DIEGO OCCURRED IN SEPTEMBER WITH TWO OF
THEM IN AUGUST...TROPICAL STORM DOREEN...AUGUST 16 AND 17...1977...TROPICAL
STORM KATHLEEN...SEPTEMBER 9-12...1976...TROPICAL
STORM HYACINTH...SEPTEMBER 3-6...1972...TROPICAL STORM KATRINA...AUGUST 31...1967
AND TROPICAL STORM KATHERINE...SEPTEMBER 17-19...1963 NORA SEPTEMBER 24-25...1997.
A THUNDERSTORM COMPLEX RUMBLED THROUGH SAN DIEGO ON SEPTEMBER 16...2014 AND
PRODUCED A RECORD WIND GUST FROM THE NORTHEAST AT 45 MPH.

AS A RULE THE NIGHT AND MORNING OVERCAST SKIES OF SUMMER BECOME
LESS PERSISTENT...BUT THE RELATIVE HUMIDITY REMAINS HIGH...AVERAGING
NEAR THAT OF AUGUST WITH 79 PERCENT IN THE MORNING...66 PERCENT
NEAR NOON AND 65 PERCENT IN THE LATE AFTERNOON.  AT THE TIME OF
THE EAST WINDS...THOUGH...SEVERAL DAYS OF DRY WEATHER AND EXTREMELY
LOW HUMIDITY PREVAIL.  CLEAR DAYS AVERAGE 15...PARTLY CLOUDY 9 AND
CLOUDY 6 WITH AN AVERAGE OF 2 DAYS OF HEAVY FOG.

$$
EMI



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