Weather and climate in the Strait of Hormuz
The strait sits in one of the hottest maritime climates on Earth. Summer (May–September) brings air temperatures of 38–45°C, sea surface temperatures above 32°C — among the warmest open-sea readings anywhere — and oppressive humidity along the coasts. Winters are mild and mostly dry, with air around 20–25°C. Rain is scarce: most of the region records under 150 mm a year, falling almost entirely between December and March.
The shamal — the wind that matters
The dominant weather hazard is the shamal, a northwesterly wind that funnels down the Persian Gulf. Winter shamals arrive behind cold fronts and can blow 30–40 knots for several days; the summer shamal ("shamal al-kabir") is more persistent, hot and dust-laden. In the strait's confined waters a strong shamal builds short, steep seas of 2–3 m, complicates bunkering and anchorage operations off Fujairah, and lofts enough dust to cut visibility below one nautical mile — a serious concern in a waterway carrying a ship every few minutes.
Visibility: haze, dust and humidity
Even without a shamal, summer visibility is frequently degraded by a milky heat haze as humid marine air meets desert aerosols. Radar and AIS keep traffic moving, but reduced visual range slows small craft, ferries and fishing fleets that share the lanes — one reason the live tracker's weather widget pairs visibility with traffic data.
Tropical cyclones: rare but real
The Arabian Sea cyclone season (May–June and October–November) occasionally reaches this far north. Cyclone Gonu in June 2007 — the strongest storm ever recorded in the Arabian Sea — passed through the Gulf of Oman with hurricane-force winds, halting traffic, scattering the Fujairah anchorage and damaging Omani ports. Such events are roughly once-a-decade rarities, but they are the only weather systems capable of genuinely disrupting Hormuz transits.
How weather shapes shipping through the strait
Day to day, weather nudges rather than stops Hormuz traffic: tankers time bunkering around shamal peaks, pilots demand wider berths in haze, and summer heat slows cargo work and stresses crews. What weather almost never does is close the strait — the deep, sheltered channel remains navigable in conditions that would shut smaller ports. For live conditions right now, check the dashboard above; for what traffic is doing about it, open the live map or today's traffic overview.