Apra Harbor (GUAPR) — marine weather & port guide
Apra Harbor is a port in Guam at 13°27.0′N 144°37.0′E. Today (Aug 3): W wind 19–19 kn, waves 2.5–2.6 m, from the ECMWF IFS run 2026-08-03 12z. The live chart on this page shows current conditions and plans weather-optimized departures from this harbor.
Port facts (NGA World Port Index)| Position | 13°27.0′N 144°37.0′E |
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| UN/LOCODE | GUAPR |
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| Harbor size | Medium |
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| Harbor type | Coastal breakwater harbor |
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| Shelter | Good |
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| Channel depth | 11 m |
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| Anchorage depth | 23 m |
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| Tide range | 1 m |
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| Pilotage | Compulsory |
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| Time zone | Pacific/Guam |
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10-day marine forecast — Apra Harbor
| Date | Wind | Gusts | Waves |
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| W 19–19 kn | 27 kn | 2.5–2.6 m |
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| WSW 19–25 kn | 32 kn | 2.7–3.0 m |
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| WSW 17–18 kn | 25 kn | 2.9–3.0 m |
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| W 15–20 kn | 25 kn | 2.9–3.0 m |
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| W 14–20 kn | 25 kn | 2.7–2.9 m |
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| WSW 18–20 kn | 26 kn | 3.1–3.2 m |
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| WSW 20–21 kn | 27 kn | 3.2–3.4 m |
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| WSW 23–23 kn | 37 kn | 3.3–3.3 m |
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| WSW 23–23 kn | 34 kn | 3.3–3.3 m |
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| WSW 20–20 kn | 30 kn | 3.0–3.0 m |
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Forecast from the ECMWF IFS model run , waves from ECMWF WAM. Updated with each model cycle; the live chart below recalculates for your departure time and vessel.
Frequently asked
How is the weather at Apra Harbor right now?
As of the ECMWF IFS run 2026-08-03 12z: W wind 19–19 kn, waves 2.5–2.6 m. The 10-day outlook is in the forecast table on this page and updates with each model cycle.
How big is the harbor at Apra Harbor?
Apra Harbor is classed as a medium harbor (coastal breakwater harbor), with good shelter in the NGA World Port Index.
How deep is the approach to Apra Harbor?
Per the NGA World Port Index, the entrance channel carries about 11 m and anchorage depths run about 23 m. Verify against current official charts before entry.
What restricts entry to Apra Harbor?
Entry is affected by tidal windows, heavy swell. Check the live forecast on this page and official notices before approach.