Climatological Report (Monthly)
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
886
CXGM50 PGUM 031343
CLMGUM
CLIMATE REPORT
NATIONAL WEATHER SERVICE TIYAN GUAM
1143 PM CHST FRI OCT 03 2025
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...THE GUAM INTERNATIONAL AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1945 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 94 09/06/2016
LOW 70 09/13/1992
09/03/1992
09/17/1972
HIGHEST 89 09/09 90 09/07
09/12
LOWEST 72 09/16 73 09/23
AVG. MAXIMUM 86.7 87.2 -0.5 86.9
AVG. MINIMUM 75.6 76.3 -0.7 76.8
MEAN 81.1
DAYS MAX >= 90 0 3.7 -3.7 1
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.0 0.0 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 32.24 2013 18.4" DURING TY PABUK
MINIMUM 3.91 1951
TOTALS 12.34 15.17 -2.83 24.38
DAILY AVG. 0.41 0.51 -0.10 0.81
DAYS >= .01 28 25.1 2.9 24
DAYS >= .10 23 19.3 3.7 15
DAYS >= .50 9 8.9 0.1 9
DAYS >= 1.00 3 4.5 -1.5 7
DAYS >= 3.00 0 3
GREATEST
24 HR. TOTAL 2.09 09/01 TO 09/01 6.01 9/11
DEGREE DAYS
COOLING TOTAL 489 502 -13 514
SINCE 1/1 4618 4630 -12 4612
FREEZE DATES
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WIND (MPH)
AVERAGE WIND SPEED 6.6
RESULTANT WIND SPEED/DIRECTION 5/090
HIGHEST WIND SPEED/DIRECTION 23/030 DATE 09/01
HIGHEST GUST SPEED/DIRECTION 39/110 DATE 09/16
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.32
NUMBER OF DAYS FAIR 18
NUMBER OF DAYS PC 12
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 82
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 2 HEAVY RAIN 14
RAIN 18 LIGHT RAIN 28
FOG 0 HAZE 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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