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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Coast Current Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above before heading to O’Sullivan Beach – conditions can shift quickly along this stretch of Gulf St Vincent. Understanding the local wind and tide patterns helps you plan a safer, more comfortable beach day.
What makes O’Sullivan Beach’s weather different?
O’Sullivan Beach sits on the eastern shore of Gulf St Vincent, about 30 kilometres south of Adelaide’s centre. Its open, north-facing coastline means the prevailing south-westerly winds are often deflected, creating lighter onshore breezes than beaches further south. Afternoon sea breezes still arrive most summer days, cooling the sand but also increasing surf and potential rip currents.
How do sea breezes affect your visit?
The daily sea breeze typically picks up around 11 am to 1 pm, reaching 20–30 km/h before easing after sunset. Morning swimming is generally calmer. The live forecast above shows today’s wind direction and speed – if the onshore wind is strong, consider sheltered activities or a morning dip. Combine wind and UV information from the forecast to stay comfortable.
What is the best time to visit O’Sullivan Beach?
Early mornings from 7–10 am offer the calmest water, lowest UV and lightest winds. Summer afternoons are still good but bring stronger breezes and higher UV – always apply sunscreen.
Are there severe weather warnings for this area?
Yes – check the Severe Weather Warning page for coastal wind and thunderstorm alerts. The Bureau of Meteorology issues warnings when gusts exceed 50 km/h or when dangerous surf is expected.
How do tides affect swimming and fishing?
Low tide exposes wide, firm sandbars extending far out – great for walking but shallow for swimming. High tide brings deeper water right to the dunes. Always check local tide times alongside the live forecast above.