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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Brief Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Semaphore weather is mild and breezy for most of the year, with warm summers and cool, wet winters. The live forecast above shows today’s conditions; the coastal location means sea breezes often keep the air fresh and changeable.
What is the typical climate in Semaphore?
Semaphore sits on the Gulf St Vincent coast, north-west of Adelaide. Summers (December–February) average highs around 29°C, but afternoon sea breezes often drop the temperature by several degrees. Winters (June–August) are cool and damp, with average highs near 15°C and most rain falling between May and September. Spring and autumn are mild and pleasant.
Because of its beachside position, Semaphore weather can shift quickly when wind changes direction. South-westerlies bring cooler air, while north-easterlies push warmer inland air across the coast.
How do tides affect Semaphore beach conditions?
Semaphore beach has a gentle slope and a wide tidal range. At low tide the water recedes hundreds of metres, exposing firm sand perfect for walking. High tide brings the water right up to the dune line. Always check semaphore tides before planning a swim or fishing trip – the Gulf can produce strong rip currents near the jetty on an outgoing tide.
Frequently asked questions about Semaphore weather
Is Semaphore weather warmer than Adelaide city?
Often slightly warmer in winter due to the moderating effect of the Gulf, but in summer the sea breeze can make it a few degrees cooler than inland suburbs. Check Adelaide Weather for direct comparison.
What is the best time of year to visit Semaphore beach?
Late spring (November) and early autumn (March) offer the most comfortable conditions: warm sun, light winds, and fewer crowds. For reliable swimming, aim for high tide in the afternoon when the water is calmest.
Where can I get a 14‑day forecast for Semaphore?
The Bureau of Meteorology provides official semaphore weather 14 days outlook, though longer-range forecasts are less accurate. For daily updates use the live forecast above or check semaphore weather hourly on a dedicated weather app.
Sources
For broader Australian conditions visit the Australia weather hub, or check semaphore weather tomorrow using the live panel above. If extreme heat or storms are forecast, see the Severe Weather Warning page for safety advice.