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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 out, as Mount Annan’s weather can shift quickly between hot, dry westerlies and humid sea breezes from the coast. This page explains what drives those changes so you can plan your day with confidence.
What makes Mount Annan’s weather different from nearby suburbs?
Mount Annan sits on the Cumberland Plain, about 55 kilometres south-west of the Sydney CBD. Its inland position means it often records higher summer maximums than coastal suburbs, and cooler overnight lows in winter. The area is also influenced by the rain shadow of the Blue Mountains, which reduces average annual rainfall compared to places closer to the escarpment.
How do the seasons affect conditions here?
Summer afternoons frequently reach the mid-30s Celsius, driven by north-westerly winds ahead of troughs. Autumn and spring bring the most stable weather, with mild days and clear nights. Winter mornings can drop below 5°C, with fog common in the low-lying parts of the Camden district. Thunderstorms are most likely in late spring and summer, often developing rapidly in the afternoon heat.
Which forecast tools are most useful for Mount Annan?
For a quick snapshot, the mount annan weather hourly breakdown in the live forecast above shows when the wind shifts or rain is likely. If you need a longer view, the weather in mount annan 10 days and mount annan weather 14 day forecast sections highlight trends in temperature and frontal passages. The mount annan weather radar from the Bureau of Meteorology is essential during thunderstorm season — keep an eye on the Sydney radar loop for cells moving east from the ranges.
Does Mount Annan get frost in winter?
Yes, particularly in low-lying paddocks and along the Nepean River flats. Clear, calm nights can drop the temperature below 2°C, and frost is common from June to August.
Is the area prone to flash flooding?
Localised flash flooding can occur after heavy summer storms, especially in the catchment of the Nepean River. Check the severe weather warning page if storms are forecast.
Why is it often windier here than in Sydney?
The flat, open plain offers little resistance to wind. North-westerlies in summer and westerlies in winter can gust strongly, making it feel cooler than the temperature suggests.
For broader conditions across the state, visit our Australia weather hub or check Sydney Weather for coastal comparisons.