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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Australia Data Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Bertram, a residential suburb about 35 kilometres south of Perth, enjoys a Mediterranean climate. The live forecast above gives you a snapshot of today’s conditions, but the bigger picture is one of warm, dry summers and mild, wet winters — typical of the region that also shapes rockingham weather just a few kilometres to the west.
What sort of weather can you expect across the year?
Summers (December to February) bring average maximums around 30°C, often with a cooling sea breeze in the afternoon. Winters (June to August) are cooler and wetter, with daytime highs near 18°C and the bulk of Bertram’s annual rainfall. Spring and autumn offer mild, pleasant transitions — perfect for outdoor plans. The wind in Bertram is most noticeable from November to February, when the afternoon sea breeze picks up from the south-west, but it rarely becomes disruptive.
How closely does Bertram’s weather match Perth’s?
Very closely. Bertram sits within the same coastal plain as Perth, so you can reliably use the Perth weather forecast as a guide, though inland suburbs are often a degree or two warmer on summer afternoons. For a more local check, the live forecast above is your best bet. If you’re planning a trip to the coast, Australia weather resources also cover Rockingham and the broader Swan region.
When is the hottest month in Bertram?
January is typically the hottest, with average maximums near 30°C. However, occasional heatwaves can push temperatures above 40°C, usually when easterly winds override the sea breeze.
Does Bertram get strong winds?
The afternoon sea breeze, known locally as the Fremantle doctor, reaches Bertram most summer days with gusts around 20–30 km/h. Winter storms can bring stronger winds, but damaging gales are uncommon.
Is there a big difference between Bertram and Rockingham weather?
Rockingham, being coastal, tends to be slightly cooler in summer and less prone to overnight frosts. Bertram, a few kilometres inland, can be a degree or two warmer on hot afternoons but otherwise shares a very similar pattern.