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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Down Under Brief Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Mt Annan’s weather today, as shown in the live forecast above, brings a mix of sun and cloud with a chance of a light shower – typical for this time of year in the Macarthur region. The south-west Sydney suburb, straddling the foothills of the Razorback Range, tends to run a couple of degrees cooler than the city centre, especially when a southerly change arrives across the Nepean floodplain.
What makes Mt Annan’s weather different from central Sydney?
Mt Annan sits about 55 kilometres south-west of the Sydney CBD, well inland, so summer heat can build more intensely here before an afternoon sea breeze arrives late – or not at all. Winter mornings are consistently colder, often dipping below 5 °C under clear skies, while fog banks from the nearby Hume Motorway corridor can linger into mid-morning. For up-to-date conditions across the metro area, check the Sydney weather page.
How does the weather affect a visit to Mount Annan Botanical Garden?
The Mount Annan Botanical Gardens – Australia’s largest botanic garden – is fully outdoors, so the best times to walk its 416‑hectare collection are spring and autumn, when daytime temperatures sit comfortably in the low 20s Celsius. Summer afternoons can feel oppressive under full sun, but the garden’s scattered eucalypt woodlands offer shade; a southerly buster can drop the mercury by 8–10 °C in under an hour. For longer-range planning, check the Australia weather hub or look up weather in Mount Annan 10 days to gauge patterns.
Is the wind usually strong at Mt Annan?
Not as gusty as coastal Sydney, but a fresh westerly can funnel through the Razorback corridor in winter, making garden walks feel noticeably cooler. South‑easterlies arriving after a hot spell often bring a sharp, rapid temperature drop.
Does Mt Annan get storms more often than the city?
Yes. Inland south‑west Sydney is a hotspot for spring and summer thunderstorms, especially when a trough stalls over the Blue Mountains. Hail and heavy downpours are possible – stay alert by checking any severe weather warning.
Where can I get an hourly breakdown for Mt Annan?
The live forecast above updates through the day. For a granular view, use the Bureau of Meteorology’s Camden Airport observations – about 8 km north-west – which closely match Mt Annan weather hourly conditions.