Semarang marine weather forecast
Semarang (IDSRG) is a port in Indonesia at 6°57.0′S 110°25.0′E. Today (Sep 18): E wind 12–14 kn, waves 0.9–0.9 m, from the ECMWF IFS run 2026-09-18 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 | 6°57.0′S 110°25.0′E |
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| UN/LOCODE | IDSRG |
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| Harbor size | Small |
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| Harbor type | Open roadstead |
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| Shelter | Good |
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| Channel depth | 8 m |
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| Anchorage depth | 11 m |
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| Tide range | 0 m |
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| Pilotage | Compulsory |
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| Time zone | Asia/Jakarta |
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Facilities & services (NGA World Port Index)| Tugs | Assistance available |
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| Supplies | Fuel oil, diesel, water, provisions |
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| Repairs | Limited |
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| Medical facilities | Available |
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10-day marine forecast — Semarang
| Date | Wind | Gusts | Waves |
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| E 12–14 kn | 17 kn | 0.9–0.9 m |
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| E 12–13 kn | 19 kn | 0.9–1.0 m |
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| E 12–16 kn | 20 kn | 1.0–1.1 m |
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| ESE 13–14 kn | 19 kn | 1.0–1.2 m |
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| E 13–14 kn | 18 kn | 0.9–1.0 m |
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| E 10–13 kn | 16 kn | 0.8–0.9 m |
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| E 14–16 kn | 20 kn | 1.0–1.2 m |
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| ENE 15–15 kn | 21 kn | 1.1–1.1 m |
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| ENE 14–14 kn | 22 kn | 1.0–1.0 m |
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| E 16–16 kn | 24 kn | 1.1–1.1 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.
What to watch in the forecast
Across the loaded 10-day outlook, the strongest daily modeled wind reaches 16 kn on Sep 24. The highest modeled significant wave height is 1.2 m on Sep 21. Compare the dated model run with official forecasts and warnings before departure.
Frequently asked
How is the weather at Semarang right now?
As of the ECMWF IFS run 2026-09-18 12z: E wind 12–14 kn, waves 0.9–0.9 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 Semarang?
Semarang is classed as a small harbor (open roadstead), with good shelter in the NGA World Port Index.
How deep is the approach to Semarang?
Per the NGA World Port Index, the entrance channel carries about 8 m and anchorage depths run about 11 m. Verify against current official charts before entry.
What restricts entry to Semarang?
Entry is affected by tidal windows, heavy swell. Check the live forecast on this page and official notices before approach.