Climatological Report (Daily)
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
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CDGM40 PGUM 300647
CLIGUM
CLIMATE REPORT
NATIONAL WEATHER SERVICE TIYAN GUAM
447 PM CHST TUE SEP 30 2025
...................................
...THE GUAM INTERNATIONAL AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 30 2025...
VALID TODAY AS OF 0400 PM LOCAL TIME.
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)
TODAY
MAXIMUM 87 11:48 AM 90 1997 87 0 88
2021
MINIMUM 75 5:05 AM 69 1967 76 -1 80
1968
1989
AVERAGE 81 82 -1 84
PRECIPITATION (IN)
TODAY 0.20 4.31 1980 0.47 -0.27 0.01
MONTH TO DATE 12.33 15.17 -2.84 24.38
SINCE SEP 1 12.33 15.17 -2.84 24.38
SINCE JAN 1 67.61 71.80 -4.19 71.60
DEGREE DAYS
HEATING
TODAY 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
TODAY 16 17 -1 19
MONTH TO DATE 490 502 -12 514
SINCE SEP 1 490 502 -12 514
SINCE JAN 1 4619 4630 -11 4612
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 2 RESULTANT WIND DIRECTION E (90)
HIGHEST WIND SPEED 7 HIGHEST WIND DIRECTION E (99)
HIGHEST GUST SPEED MM HIGHEST GUST DIRECTION MM
AVERAGE WIND SPEED 3.8
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 5:00 AM
LOWEST 67 12:00 PM
AVERAGE 82
..........................................................
THE GUAM INTERNATIONAL AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 87 90 1951
MINIMUM TEMPERATURE (F) 76 69 1968
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.
$$