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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Briefly Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Sydney’s Christmas Day forecast, based on the live forecast above, shows a warm and mostly sunny day with a top around the high twenties to low thirties in Celsius, typical for a coastal December afternoon. The Bureau of Meteorology expects a light seabreeze to keep the harbour suburbs comfortable, though inland western areas may feel a few degrees hotter.
What’s the typical December weather for Sydney?
December in Sydney brings summer heat, with average maximums of 25–27°C near the coast and 28–30°C in the west. Humidity often rises in the week before Christmas, but a southerly change or seabreeze can drop temperatures by 5–8°C along the shore. For 2025, the outlook suggests near-average conditions, with a low chance of rain on Christmas Day itself.
How does Christmas Day compare to Boxing Day?
Boxing Day weather in Sydney is usually similar to Christmas Day, though a trough can bring afternoon storms. The live forecast above gives a clearer picture for this year, but historically Boxing Day runs 1–2°C cooler if a southerly change arrives. Check the Sydney Weather page for updates on both days.
Will it rain on Christmas Day in Sydney?
Based on the live forecast above, rain is unlikely for most of the day. A 10–20% chance of a brief shower exists in the afternoon, typical for a summer seabreeze pattern. Check the Severe Weather Warning page for any sudden changes.
What’s the best time to be outdoors on Christmas Day?
Morning until early afternoon is ideal, before the seabreeze picks up around 2–3 pm. The harbour and eastern suburbs stay cooler, while western Sydney heats up by midday. UV levels are extreme from 10 am to 4 pm, so bring shade and sunscreen.
How does Christmas Day 2025 compare to last year?
Christmas Day 2024 reached 28°C in the city with a light seabreeze. The 2025 forecast, per the live data above, looks similar but with slightly lower humidity. For the latest, see the Australia weather hub for statewide trends.