Melbourne in May: 17°C / 63°F afternoons, 8°C / 46°F mornings, 11 rain days — Southern Hemisphere autumn, colder than Sydney's mild May.
May in Melbourne is Southern Hemisphere autumn at full intensity. Australian Bureau of Meteorology (BoM) data put afternoons at 17°C / 63°F, mornings at 8°C / 46°F, 11 rain days totalling ~60mm, and 10h 35m of daylight. The wardrobe register is laneway-considered, distinctly cooler and dressier than Sydney's harbour-relaxed: wool sweater, packable trench, dark straight-leg jeans or wool-blend trousers, low-heel leather boots or oxfords, structured leather bag. Melbourne's 'four seasons in one day' is a meteorological reality — a sunny 17°C / 63°F morning can drop to 10°C / 50°F rain by 3pm and rise back to 14°C / 57°F clear by 7pm. The local design vocabulary: Camilla and Marc (Melbourne-founded 2003), Christopher Esber (Sydney-Melbourne crossover), Aje (contemporary Australian), Albus Lumen (Melbourne resort-luxury), Bassike (relaxed Australian quality basics, Sydney-founded but Melbourne-popular), Country Road (mid-tier Australian heritage). Fitzroy and Brunswick run creative-residential laneway culture; Carlton runs Italian-academic; South Yarra is European-luxury; St Kilda is beach-bohemian; Collingwood is gallery-design. Coffee culture (third-wave) reaches its highest expression here — Melbourne's espresso scene predates Sydney's by a decade.
Melbourne's 'four seasons in one day' is a meteorological truth — a 17°C / 63°F sunny morning can hit 10°C / 50°F rain by 3pm and 14°C / 57°F clear by 7pm, all in the same afternoon coffee run.

The Melbourne May base layer. Camilla and Marc, COS, or international Margaret Howell. Layers under the trench, alone in 17°C / 63°F afternoons.

Under-layer for 8°C / 46°F mornings + 17°C / 63°F afternoons. Sunspel, COS, or Country Road for Australian-cut budget.

Burberry trench, Akris, or accessible Aje (Australian). Belt it for the Italian-academic Carlton register; tie back for casual Fitzroy laneway café walks. Daily infrastructure given Melbourne's weather variability.

Two bottoms. Jeans for Brunswick and Fitzroy laneway days; wool-blend trousers for South Yarra dinners. Closed (German), A.P.C. New Standard, or Christopher Esber Australian.

The Melbourne shoe. R.M. Williams Comfort Craftsman boots (Australian heritage since 1932), Common Projects oxfords, or Vagabond. Laneway pavement is uneven; skip stilettos universally.

11 rain days, mostly sudden afternoon showers. Rains, Patagonia Torrentshell, or Akubra (Australian heritage, more for the bush than city). Compact umbrella for the European-style laneway covered-arcade transitions.

Camilla and Marc, Christopher Esber, or international Mansur Gavriel and Strathberry. Skip slouchy canvas — Melbourne's laneway café register reads structured-leather over relaxed.

8°C / 46°F mornings need a layer at the throat. Wool or silk in solid cream, charcoal, navy, oxblood. Skip patterned scarves with logos.
Cotton long-sleeve · wool sweater · jeans · low-heel boots · trench · scarf · structured bag. Coffee at Patricia (CBD) or Brother Baba Budan 8am, Brunswick Street browse 10am, lunch at Cumulus Inc.
Cotton blouse · wool trousers · low-heel oxfords · trench · structured bag. Dinner at Attica (Ripponlea), Vue de Monde (Rialto Towers), or Cutler & Co. 8pm; drinks at Black Pearl or Bar Liberty after.
A suggested look — Melbourne May walking look: ivory cotton long-sleeve, cream wool sweater, dark straight-leg jeans, low-heel brown leather boots, camel trench open.
Per Australian Bureau of Meteorology (BoM) data: average daily high is 17°C / 63°F, low is 8°C / 46°F, 11 rain days totalling ~60mm. Daylight is 10h 35m and contracting. May is Southern Hemisphere late autumn — Melbourne sits 870km south of Sydney, so May is meaningfully colder here than there. Melbourne's 'four seasons in one day' is real: temperature swings of 10-12°C / 50-54°F across a single day are routine.
Latitude. Melbourne sits at 37.8°S, Sydney at 33.9°S — Melbourne is approximately 870km south of Sydney, comparable to the latitude shift between Toronto and New York or between Madrid and Casablanca. Bass Strait air also funnels cold-snap weather into Melbourne from Tasmania (which is even further south at 42°S). Melbourne May afternoon highs (17°C / 63°F) sit ~9°C / 16°F below Sydney May (26°C / 79°F); Melbourne May mornings (8°C / 46°F) sit ~4°C / 7°F below Sydney's (12°C / 54°F).
Camilla and Marc (Melbourne-founded 2003, multiple Melbourne flagships), Christopher Esber (Sydney-Melbourne crossover), Aje (contemporary Australian), Albus Lumen (Melbourne resort-luxury), Bassike (Sydney-founded but Melbourne-popular, Chapel Street and Collins Street), Country Road (mid-tier Australian heritage, multiple), R.M. Williams (Australian boot heritage since 1932, Collins Street). Chapel Street in South Yarra holds the European-luxury register (Hermès, Dior, Loro Piana). Brunswick and Fitzroy hold independent boutiques and concept stores (Alpha60, Lab and others). Collins Street in CBD has international flagships.
Melbourne's third-wave espresso culture predates Sydney's by approximately a decade — local lore traces it to Italian-Greek immigration in the 1950s-60s and the city's early adoption of European espresso machines. Defining cafés today: Patricia (CBD, multi-roaster), Brother Baba Budan (CBD, hat-ceiling icon), Seven Seeds (Carlton), Market Lane Coffee (multiple, Prahran flagship), Industry Beans (Fitzroy), Auction Rooms (North Melbourne). Melbourne residents view coffee culture as identity — a flat white at Patricia or a cortado at Brother Baba Budan reads more local than any tourist landmark.
Low-heel leather boots, oxfords, or loafers with a real outsole. R.M. Williams Comfort Craftsman boots (Australian heritage), Common Projects oxfords, Vagabond, Dr. Martens 1461. Skip stilettos universally — Lygon Street, Brunswick Street, Hardware Lane, and Centre Place all run uneven cobbled or brick pavement. Skip flip-flops outside St Kilda Beach. The Melbourne register reads polished-casual leather over technical-athletic.