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Apra Harbor, Guam: water level history

Record1948–202573 years
Sea level trend5.38 mm/yrNo. 7 of 88
Great diurnal range0.72 mNo. 83
Highest water level1.31 m1992-08-28

Annual mean water level vs. period average (cm)

annual1948: 15.819481949: 15.71950: 17.01951: 12.31952: 14.21953: 21.41954: 19.31955: 16.11956: 10.61957: 16.219571958: 7.61959: 10.61960: 13.71961: 16.11962: 16.71963: 10.91964: 11.61965: 13.41966: 11.919661967: 5.11968: 6.61969: 9.11970: 21.41971: 23.01972: 01973: 12.61974: 11.21977: 15.519771978: 13.81979: 10.81980: 13.51981: 17.81982: 7.21983: 3.41984: 23.21985: 16.41986: 10.019861987: 5.91988: 17.71989: 15.61990: 5.41991: 5.51992: 5.61993: 13.61994: 17.51995: 14.119951996: 23.01997: 5.81999: 28.52000: 27.52001: 24.82002: 18.72003: 19.22005: 22.92006: 28.520062007: 26.42008: 35.22009: 27.82010: 25.32012: 32.32013: 32.42014: 23.52015: 12.42016: 16.920162017: 29.22018: 22.42019: 20.92020: 24.32021: 34.82022: 33.52023: 24.92024: 32.62025: 38.42025

Bars are relative to the lowest year on record.

Top 10 monthly highest water levels

MonthHighest (m above MSL)
August 19920.890
May 20250.735
April 20250.721
September 20180.708
June 20080.704
July 20250.702
June 20250.696
July 20050.684
July 20130.680
May 20210.679
Times and heights are NOAA astronomical predictions and do not include weather effects. Times are station local time (incl. daylight saving), heights in metres above MLLW. Not for navigation.
About this page

Monthly mean water levels at Apra Harbor, Guam since 1948. Long-term sea level trend: 5.38 mm per year.