494 
FPUS86 KSGX 020403
OPUSAN

OCTOBER WEATHER IN SAN DIEGO

OCTOBER IS THE LAST OF THE DRY MONTHS AND IS USUALLY A TRANSITIONAL 
PERIOD WITH VARIABLE WEATHER. IT'S A MIXTURE THAT INCLUDES WEATHER 
FROM THE PREVIOUS DRY MONTHS WITH A PREVIEW OF THE UPCOMING WET 
MONTHS.

THE NORMAL DAILY MAXIMUM TEMPERATURE IS 70.7 DEGREES AND THE NORMAL 
DAILY MINIMUM IS 54.8 DEGREES WITH A MEAN MONTHLY TEMPERATURE OF 
62.7 DEGREES. EXTREMES FOR THE MONTH RANGE FROM 107 DEGREES IN 1961 
TO 43 DEGREES IN 1971.

THERE ARE TWO DAYS OF MEASURABLE RAIN ON THE AVERAGE, INCLUDING ONE 
DAY OF THUNDERSTORMS. THESE WET DAYS USUALLY OCCUR LATE IN THE MONTH 
AS STORM SYSTEMS FROM THE PACIFIC MOVE FARTHER SOUTH.  THE AVERAGE 
RAINFALL IS 0.50 INCH. THIS IS 0.38 OF INCH MORE THAN SEPTEMBER AND 
0.29 OF AN INCH LESS THAN NOVEMBER. THE GREATEST MONTHLY TOTAL WAS 
4.98 INCHES IN 2004. THE MINIMUM IS ZERO WHICH LAST OCCURRED IN 
2001. ON OCTOBER 3, 1858, A CATEGORY ONE HURRICANE STRUCK SAN DIEGO, 
THE ONLY DOCUMENTED HURRICANE TO STRIKE THE WEST COAST OF THE UNITED 
STATES.

OCTOBER HAS PLENTY OF SUNSHINE WITH 68 PERCENT OF POSSIBLE.
OCTOBER AVERAGES 14 CLEAR DAYS, 10 PARTLY CLOUDY AND 7 CLOUDY DAYS. 
DURING THE MONTH THERE ARE AN AVERAGE OF 3 DAYS OF HEAVY FOG. THERE 
IS AN AVERAGE OF ONE DAY OF CLEAR DRY WEATHER WHEN SANTA ANA WINDS 
PUSH TEMPERATURES INTO THE 90S.

RELATIVE HUMIDITY AVERAGES 75 PERCENT IN THE EARLY MORNING, 60 
PERCENT NEAR NOON, AND 62 PERCENT IN THE LATE AFTERNOON. WIND SPEEDS 
AVERAGE 6.5 MPH. THE STRONGEST WIND FOR THE MONTH OCCURRED IN 2004 
ON THE 20TH AT 929 AM AND WAS FROM THE SOUTH AT 39 MPH.