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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Coast Monitor Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
North St Marys in Western Sydney is currently experiencing the conditions shown in the live forecast above. Expect warm, mostly sunny days in summer and cool, clear nights in winter, with the main weather risk being afternoon thunderstorms from November to March.
What is the typical weather pattern for North St Marys?
North St Marys sits on the Cumberland Plain, about 50 kilometres west of the Sydney CBD. Summers are hot and humid, with temperatures often reaching the mid-30s Celsius. Winters are mild and dry, with overnight lows around 5–8°C and daytime highs near 17–19°C. Rainfall is spread fairly evenly, though late spring and summer see more intense downpours from thunderstorms. For a broader picture, see Sydney Weather and the Australia weather hub.
How can I find weather for St Marys NSW beyond the live forecast?
For detailed outlooks, check the Bureau of Meteorology’s forecasts for the Western Sydney area. You can also use search terms like weather st marys nsw or weather in saint marys nsw 10 days for extended projections. For a longer view, st marys weather 14 day forecasts are available through commercial weather sites, though confidence drops after day 7. If you are heading into the city, Severe Weather Warning pages provide alerts for hazardous storms or heatwaves.
When do thunderstorms most often occur in North St Marys?
Thunderstorm season runs from October to March, peaking in December and January. Storms usually develop in the late afternoon or evening, driven by heat and humidity. Use the BOM radar for live tracking.
Does North St Marys get frost in winter?
Light frost can form on calm, clear nights from June to August, especially in low-lying parts of the suburb. Temperatures occasionally drop to 2–3°C, but hard frosts are rare compared to inland areas further west.
How reliable are 10-day forecasts for St Marys NSW?
Forecasts for days 8–10 have moderate accuracy for temperature trends, but rainfall timing and amounts often change. Use the 7-day forecast for planning, and check the BOM’s updated outlook each morning.