The best time to visit South-West Australia

Isolated even by Australian standards: a sunny capital, karri forest, and a wine region on a cape between two oceans. Daytime highs in the south-west of Western Australia run from about 16 °C in July to 28 °C in February, an annual range of roughly 12 °C.

Measured against a beach trip, the conditions hold up November to April. January is the most consistent single month: highs near 27 °C, nights around 18 °C, and roughly 15 mm of rain across the month.

The binding constraint here is temperature and rainfall — that is what rules months out, not any composite judgement. Rainfall is sharply seasonal: July averages 109 mm against 15 mm in January, so the wet season is the real planning constraint rather than heat or cold. May is the weakest month on these criteria.

What the south-west of Western Australia is known for

Margaret River produces a small share of Australia's wine but a large share of its premium bottles
Rottnest Island, a ferry from Fremantle, is the easiest place to see quokkas
Wildflower season across the south-west is one of the largest such blooms on Earth, with thousands of endemic species
The Busselton Jetty runs almost 2 km offshore, the longest timber-piled jetty in the southern hemisphere
Perth is among the most remote major cities anywhere — Adelaide is a 2,100 km drive

Month by month

Month	High °C	Low °C	Precip mm	Wet days
January	27	18	15	2.2
February	28	18	16	2.3
March	26	17	23	3.8
April	23	15	37	5.7
May	19	13	66	9.0
June	17	11	93	12.1
July	16	10	109	14.3
August	16	10	95	13.1
September	17	11	66	10.9
October	20	12	42	7.3
November	22	14	24	5.2
December	25	16	18	2.9

Ticked rows are months where every hard requirement for a beach trip is met across at least half the month.

By trip type

Beach	November to April
City	March to December

Each row applies that trip type's own hard limits to the same climate data.

Open South-West Australia on the map →

Wings of a male Western Inland Hunter, Austrogomphus collaris, a dragonfly in the family Gomphidae. Australian © John Tann from Mullumbimby, Australia, CC BY 2.0 · cropped and resized · Wikimedia Commons

Wings of a female Western Ringtail, Austrolestes aleison, a damselfly in the family Lestidae. Australian Museu © John Tann from Mullumbimby, Australia, CC BY 2.0 · cropped and resized · Wikimedia Commons

Nearby regions

Figures are 30-year climatology sampled at Perth, Fremantle, Margaret River, Busselton and Albany, averaged across those locations, from ERA5-Land reanalysis fitted with a harmonic seasonal cycle and a trend term, evaluated for 2026. Sampling named towns rather than averaging the whole region avoids blending valley and mountain conditions into a figure true of neither. Cells are about 0.08° wide, from ERA5-Land's 0.1° grid, which is itself driven by a 0.25° (~28 km) atmospheric reanalysis — so individual valleys, sheltered bays and single summits are not resolved. In steep terrain read these as conditions for the wider area rather than for one village. They describe typical conditions, not a forecast. Read how the climatology is built.