Climatological Report (Daily)
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
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CDGM40 PGUM 291620
CLIGUM
CLIMATE REPORT
NATIONAL WEATHER SERVICE TIYAN GUAM
220 AM CHST TUE SEP 30 2025
...................................
...THE GUAM INTERNATIONAL AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 29 2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1945 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 85 3:56 PM 90 1951 87 -2 88
1992
2009
MINIMUM 76 5:54 AM 68 1967 76 0 78
1968
1976
AVERAGE 81 82 -1 83
PRECIPITATION (IN)
YESTERDAY 0.17 2.95 1962 0.48 -0.31 0.02
MONTH TO DATE 12.17 14.70 -2.53 24.37
SINCE SEP 1 12.17 14.70 -2.53 24.37
SINCE JAN 1 67.45 71.33 -3.88 71.59
DEGREE DAYS
HEATING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 0 0 0 0
SINCE JUL 1 0 0 0 0
COOLING
YESTERDAY 16 17 -1 18
MONTH TO DATE 474 493 -19 495
SINCE SEP 1 474 493 -19 495
SINCE JAN 1 4603 4621 -18 4593
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 5 RESULTANT WIND DIRECTION E (100)
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION E (70)
HIGHEST GUST SPEED MM HIGHEST GUST DIRECTION MM
AVERAGE WIND SPEED 5.8
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 94 12:00 AM
LOWEST 72 4:00 PM
AVERAGE 83
..........................................................
THE GUAM INTERNATIONAL AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 87 90 1997
2021
MINIMUM TEMPERATURE (F) 76 69 1967
1968
1989
SUNRISE AND SUNSET
SEPTEMBER 30 2025.....SUNRISE 6:10 AM CHST SUNSET 6:11 PM CHST
OCTOBER 1 2025.......SUNRISE 6:10 AM CHST SUNSET 6:11 PM CHST
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$