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CLIMATE REPORT
NATIONAL WEATHER SERVICE EUREKA CA
322 PM PDT MON OCT 05 2026
...............................
..THE EUREKA CA CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2026
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1886 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 87 09/02/2017
LOW 36 09/22/1895
HIGHEST 74 09/09 MM MM 73
LOWEST 48 09/29 MM MM 47
AVG. MAXIMUM 64.7 63.9 0.8 65.7
AVG. MINIMUM 52.6 50.5 2.1 54.2
MEAN 58.6 57.2 1.4 59.9
DAYS MAX >= 90 0
DAYS MIN <= 32 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 4.26 1901
MINIMUM 0.00 1929
TOTALS 0.65 0.68 -0.03
DAYS >= .01 6 4.7 1.3 10
DAYS >= .10 2 1.6 0.4 3
DAYS >= .50 0 0.2 -0.2 1
DAYS >= 1.00 0 0.1 -0.1 0
GREATEST
24 HR. TOTAL 0.33 09/02 TO 09/02
LIQUID 7/1 MM MM
DEGREE DAYS
HEATING TOTAL 186 234 -48 144
SINCE 7/1 544 661 -117 MM
COOLING TOTAL 0 0 0 0
SINCE 1/1 0 1 -1 MM
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 2.5
HIGHEST WIND SPEED/DIRECTION 14/170 DATE 09/02
14/320 09/06
14/320 09/25
HIGHEST GUST SPEED/DIRECTION 18/MM DATE 09/14
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.63
NUMBER OF DAYS FAIR 5
NUMBER OF DAYS PC 13
NUMBER OF DAYS CLOUDY 12
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 HEAVY RAIN 0
RAIN 1 LIGHT RAIN 12
HAIL 0 SLEET 0
FOG 16 FOG W/VIS <= 1/4 MILE 4
HAZE 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
SEPTEMBER WAS, OVERALL, A RELATIVELY MILD MONTH WITH TEMPERATURES
SLIGHTLY WARMER THAN NORMAL AND PRECIPITATION AROUND NORMAL. THE
MONTH BEGAN WITH AN UNUSUALLY WET SYSTEM, FOR THIS TIME OF YEAR,
BRINGING 0.33 INCHES OF RAIN IN 24 HOURS ON SEPTEMBER 2ND. THE
RECORD PRECIPITATION FOR SEPTEMBER 2ND WAS 0.39 INCHES, SET IN 1912.
BY THE SECOND WEEK OF THE MONTH, WARMER AIR AND OFFSHORE FLOW ALOFT
AIDED IN BRINGING WARMER THAN AVERAGE HIGH TEMPERATURES. THE
OBSERVED HIGH TEMPERATURE ON SEPTEMBER 9TH REACHED 74 DEGREES, ONLY
TWO DEGREES LESS THAN THE RECORD HIGH TEMPERATURE FOR THAT DAY OF
76, SET IN 1976. ANOTHER WET SYSTEM CAME THROUGH THE AREA ON
SEPTEMBER 24TH BRINGING 0.19 INCHES. THE NORMAL 24-HOUR
PRECIPITATION TOTAL FOR THAT DAY IS 0.03 INCHES. THERE WERE FOUR
NIGHTS/EARLY MORNINGS OF DENSE FOG, TWO IN THE FIRST WEEK OF THE
MONTH AND TWO IN THE LAST HALF OF THE MONTH. THIS ADDED MINIMAL
AMOUNTS OF DRIZZLE TO THE PRECIPITATION TOTAL OF THE MONTH, 0.65
INCHES (NORMAL FOR SEPTEMBER IS 0.68 INCHES).
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