Climatological Report (Daily)
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
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CDGM40 PGUM 210652
CLIGUM
CLIMATE REPORT
NATIONAL WEATHER SERVICE TIYAN GUAM
452 PM CHST THU AUG 21 2025
...................................
...THE GUAM INTERNATIONAL AIRPORT CLIMATE SUMMARY FOR AUGUST 21 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 85 12:35 PM 91 1969 87 -2 84
1971
MINIMUM 75 8:10 AM 71 1960 77 -2 77
1991
AVERAGE 80 82 -2 81
PRECIPITATION (IN)
TODAY 0.90 5.02 1976 0.55 0.35 0.54
MONTH TO DATE 9.53 12.00 -2.47 10.62
SINCE JUN 1 36.02 30.76 5.26 26.13
SINCE JAN 1 51.75 50.97 0.78 43.00
DEGREE DAYS
HEATING
TODAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE JUN 1 0 0 0 0
SINCE JUL 1 0 0 0 0
COOLING
TODAY 15 17 -2 16
MONTH TO DATE 364 357 7 363
SINCE JUN 1 1398 1451 -53 1440
SINCE JAN 1 3962 3963 -1 3921
...................................................................
WIND (MPH)
RESULTANT WIND SPEED 6 RESULTANT WIND DIRECTION NE (40)
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION NE (50)
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION N (360)
AVERAGE WIND SPEED 7.7
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
HEAVY RAIN
RAIN
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 94 3:00 PM
LOWEST 79 1:00 PM
AVERAGE 87
..........................................................
THE GUAM INTERNATIONAL AIRPORT CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 87 92 1966
MINIMUM TEMPERATURE (F) 77 70 1986
SUNRISE AND SUNSET
AUGUST 21 2025........SUNRISE 6:09 AM CHST SUNSET 6:39 PM CHST
AUGUST 22 2025........SUNRISE 6:09 AM CHST SUNSET 6:38 PM CHST
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$