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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Coast Pulse Hub Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Saint Marys, in western Sydney, currently experiences mild to warm conditions typical of late autumn, with the live forecast above showing today’s trend. The area sits on the Cumberland Plain, where weather patterns are shaped by coastal influences and inland heating, creating distinct seasonal shifts.
What is the typical weather pattern for Saint Marys?
Saint Marys has a humid subtropical climate with warm summers and cool winters, moderated by its proximity to the Blue Mountains. Summer highs often reach the low 30s Celsius, while winter lows can drop to single digits, with frost possible in nearby valleys.
- Summer (December–February): Hot and occasionally humid, with afternoon thunderstorms common.
- Autumn (March–May): Mild days and cool nights; stable conditions with less rain.
- Winter (June–August): Cool and dry, with morning fog and clear skies.
- Spring (September–November): Warming trend, with increasing humidity and gusty westerly winds.
How does Saint Marys weather compare to weather in Sydney?
Saint Marys is generally 3–5°C hotter than the Sydney coast in summer and cooler in winter due to its inland location. The area also receives less coastal cloud and more clear-sky days, making it a useful reference for Sydney Weather patterns inland.
What is the weather in Saint Marys NSW for the next 10 days?
For a detailed outlook, refer to the live forecast above. The weather in saint marys nsw 10 days shows a typical autumn pattern: mild days around 22–26°C, with overnight lows near 10–14°C and low rain chances midweek.
Is Saint Marys in Tasmania different for weather?
Yes—St Marys in Tasmania (often spelled “St Marys weather TAS”) is a coastal town with a cool temperate climate, much cooler than the NSW version. It receives higher rainfall and lower summer highs, typically 18–22°C in January.
Where can I find a 14-day forecast for St Marys?
For a longer range, check the st marys weather 14 day outlook on the Bureau of Meteorology site. These forecasts are less reliable beyond 7 days but can indicate broad trends for planning outdoor activities.
For broader Australian conditions, visit our Australia weather hub or check severe weather warnings if storms are forecast.