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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Australia Pulse 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; Dundas Valley in Sydney’s north-west typically sees mild, humid summers and cool, damp winters, with afternoon sea breezes moderating the heat in warmer months.
What is the typical temperature range for Dundas Valley?
Dundas Valley’s average summer maximum sits between 27°C and 30°C, with overnight lows around 18°C to 21°C. Winter brings cooler conditions, with daytime highs of 16°C to 19°C and overnight lows dropping to 6°C–9°C. The valley’s inland position, about 20 kilometres from the coast, means it avoids the extreme heat of western suburbs like Penrith weather but is warmer than coastal Sydney weather.
How does rainfall vary across the year?
Rainfall is fairly evenly spread, with a slight autumn peak (March–May). Dundas Valley receives about 900–1000 millimetres annually, with February and March the wettest months (100–130 mm each). Winter (June–August) is drier, averaging 50–70 mm per month, often from slow-moving troughs. For comparison, Blacktown weather typically sees similar totals but slightly higher summer thunderstorm activity.
Frequently Asked Questions
Does Dundas Valley get foggy in winter?
Yes, frosty mornings are rare, but valley fog can form overnight due to cold air drainage from nearby hills, especially after rain. Visibility may drop below 200 metres between 5 am and 8 am on about 10–15 mornings a year.
How does Dundas Valley compare to Parramatta weather?
Dundas Valley is slightly cooler and wetter than Parramatta, being a few kilometres further inland and at a lower elevation. Both suburbs share similar seasonal patterns, but Dundas Valley’s valley location traps more moisture and fog.
When is the best time to visit for outdoor activities?
March to May offers mild temperatures (20–26°C) and lower humidity, with fewer thunderstorms than summer. For gardening or walks, check the Dundas Valley weather hourly forecast to avoid afternoon showers.