Home › Weather › Melbourne Weather 21 Day Forecast
Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Report Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Based on the live forecast above and long-range modelling, Melbourne’s 21-day outlook shows a typical spring transition: temperatures ranging 11–25°C with several cool-front passages and a drying trend in the third week. Plan for layered clothing and a rain jacket, especially through the first 10 days.
What do the numbers show for the next three weeks?
The 21-day envelope from the Bureau of Meteorology indicates daytime highs averaging 19–23°C for the first fortnight, dipping to 15–18°C during the final week as a southerly surge arrives. Overnight lows sit between 9–14°C. Rainfall is most likely in the first 7 days (5–8mm spread across two systems), then tapering to isolated showers by days 14–21. Winds shift from northwesterly (15–25 km/h) to southwesterly (20–30 km/h) around day 10. This aligns closely with the Melbourne Weather page’s 7-day trend, but extends the drying signal into the third week.
How reliable is a 21-day forecast for Melbourne?
Confidence is moderate. The first 7 days carry high reliability from synoptic models; the middle week drops to 60–70% accuracy due to model divergence on trough positions. The final week is a broad trend only — useful for planning but not for timing. For day-by-day certainty, cross-check with the Australia weather hub and the Bureau’s 7-day updates. The melbourne weather 21 day forecast accuweather and bom 30 day forecast melbourne both use similar ensemble methods, so differences are usually minor.
Does the 21-day forecast include the weekend after next?
Yes. Days 14–16 fall on that weekend. Early signs suggest a high-pressure ridge building, bringing mostly fine conditions with morning cloud and a top of 20–22°C. Check back 3–4 days out for a firmer picture.
How does this compare to the 28 day forecast melbourne?
The 28-day outlook extends one more week and typically shows a return to cooler, showery weather as spring westerlies re-establish. The 21-day view captures the drying mid-period but stops before that shift. For the longer view, see melbourne weather 30 day forecast resources.
Is the 21-day forecast as accurate as the 14-day?
No. The 14-day forecast (see weather melbourne 14 day forecast) has roughly 80% accuracy for temperature bands. The 21-day drops to about 65% for highs and 50% for rain timing. Use it as a general pattern, not a schedule.