Home › Weather › Weather Saint Marys
Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Insightly Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The live forecast above shows current conditions for Saint Marys. This western Sydney suburb, located near the Nepean River and the Blue Mountains foothills, typically experiences a temperate climate with warm summers and mild winters, though its inland position can lead to more pronounced temperature swings than coastal suburbs.
What is the typical weather pattern for Saint Marys?
Saint Marys, situated about 45 kilometres west of the Sydney CBD, sits in a rain shadow area that often records lower rainfall than the coast. Summers here are warm to hot, with January averages around 28°C, while winters are cool and crisp, with July lows near 5°C. The area can experience occasional severe storms in spring and summer, often developing from inland heat and moisture.
How does the local geography affect Saint Marys weather?
Being inland and close to the Cumberland Plain, Saint Marys often sees hotter days than those near the coast, especially when westerly winds arrive. Conversely, sea breezes from the east can moderate afternoon temperatures. The Nepean River corridor can also funnel localised fog or cooler air in winter, making mornings noticeably brisk.
What is the best time of year to visit Saint Marys?
Autumn (March to May) offers mild days and lower humidity, ideal for exploring the nearby Blue Mountains. Spring (September to November) is also pleasant, though storm activity can increase.
Does Saint Marys get much wind?
Yes, westerly winds can be strong, particularly in late winter and spring. These can raise fire danger ratings and stir dust on the plain, but also help clear the air after wet spells.
How does weather in saint marys nsw 10 days compare to coastal Sydney?
Saint Marys is often a few degrees warmer in summer and cooler in winter than the coast. The 10-day outlook for Saint Marys typically shows less cloud and lower humidity than coastal suburbs like Bondi.
Sources
For broader conditions across the state, check our Australia weather hub or see the latest weather Sydney updates. Those looking further afield can compare with Melbourne weather or Brisbane weather. If you’re tracking longer patterns, consider the severe weather warning page for alerts. For specific outlooks, st marys weather tas and st marys weather 14 day forecasts offer tailored details.