Cabo in May is dry-Pacific shoulder — 32°C / 90°F afternoons, 17°C / 63°F nights, 0 rain days. Calm seas, lower rates than spring break, before chubasco season opens.
Cabo San Lucas in May runs Pacific-Mexican dry shoulder season. SMN (Servicio Meteorológico Nacional) Los Cabos data put afternoon highs at 32°C / 90°F and overnight lows at 17°C / 63°F with 0 rain days; UV index 11 (extreme), humidity 55% (dry compared to Cancún's Caribbean 75%). The 12°C / 22°F diurnal swing is the Cabo signature — pack a pashmina or light cardigan even in May for the 17°C / 63°F Médano Beach evening breeze and the Pedregal hillside cooler nights. The dressing register splits two: the resort imports (Tory Burch, Lilly Pulitzer Palm Beach 1959, Tommy Bahama, Heidi Klein swimwear, Eres swimwear at the Esperanza, Mar Adentro, One&Only Palmilla, Las Ventanas al Paraíso) for daytime + Mexican heritage (Pineda Covalín founded Mexico City 1996 — silk-printed scarves citing Mexican folk-art motifs; Carla Fernández founded Mexico City 2000 — handwoven heritage with Mexican artisan collectives) for evening at Edith's, Flora Farm, El Farallon. The Marina Cabo San Lucas anchors sportfishing; El Arco (the iconic granite arch at Land's End where Pacific meets Sea of Cortez) is the recognized sunset-cruise destination. Reef-safe sunscreen not legally mandated in BCS but Santa María Cove snorkel operators enforce mineral-only; pack zinc-based for the Cabo Pulmo National Park (UNESCO Bisbee's Black & Blue territory). Spring break (mid-March through mid-April) ends; May is the calm before peak summer rates climb in June.
Cabo May is the dry-Pacific shoulder — Médano Beach at peak walking weather, the El Arco granite sunset cruise at calm seas, the San José del Cabo Art District Thursday-night Art Walk landing the Pineda Covalín spring collection. Linen + huaraches + pashmina for the night drop.

SMN Los Cabos logs 32°C / 90°F afternoons through May with 12-knot Pacific trade winds and 55% humidity (dry compared to Cancún). Cotton in coral, ivory, or sand for the daily Médano Beach walk and the Marina shopping; linen in oat for the Edith's (Cabo San Lucas, the heritage Mexican-fusion fine dining) sunset reservation. Skip rayon — the dry Pacific air still wrinkles at midday.

Daily wear at the Marina Cabo San Lucas, the San José del Cabo Art District (the heritage Thursday-night Art Walk runs 5pm-9pm, November-June), and the Cabo Pulmo National Park drive. Linen in flax for the Flora Farm farm-to-table reservation (San José del Cabo, the heritage organic-farm restaurant since 2009); cotton shorts for the Médano paddleboard morning. Skip black — heat-absorbing in 32°C / 90°F afternoons.

Mexican leather huaraches (the heritage hand-woven leather sandal — local San José del Cabo and Todos Santos artisans sell at the Art District for $40-80, Mexico City brands like Pineda Covalín stock the polished version $150+) in cognac or natural for the Marina cobble walking and the Médano Beach restaurant runs. Skip flip-flops at every recognized restaurant — huaraches are the local-correct casual.

Pacific Sea of Cortez at 23°C / 73°F per SMN — cooler than Cancún Caribbean. Cover-up in white or pastel for the Médano Beach swim and the Santa María Cove snorkel boat (operators enforce mineral-only sunscreen); UPF 50 long-sleeve sun shirt for the Cabo Pulmo National Park snorkel — UV index 11 burns shoulders in 20 minutes.

Pacific evenings drop the Médano restaurants to 19°C / 66°F and the Pedregal hillside (200m / 660ft elevation) to 16-18°C / 61-64°F. Cotton or merino in ivory layers under the linen midi for the El Farallon (Pedregal cliff dining at the Resort at Pedregal — the heritage cliffside seafood) sunset and the One&Only Palmilla evening.

Pacific UV index 11 (extreme) by 10am. SPF 50 (mineral preferred for snorkel days) and a wide-brim sun hat for the El Arco sunset cruise (the Pisces Yachts catamaran is the recognized operator); polarized lenses cut Pacific glare on the Médano paddleboard morning. The Sea of Cortez sunlight reflects sharper than Caribbean — pack zinc-based for snorkel days even though BCS doesn't legally require it.

Pineda Covalín (Mexico City 1996 — silk-printed scarves citing Mexican folk-art motifs, Day-of-the-Dead patterns, Yucatecan textile patterns) and Carla Fernández (Mexico City 2000 — handwoven heritage with Mexican artisan collectives, the recognized Mexican-couture-with-craft heritage) hold the Mexican heritage register at evening. The El Farallon, Edith's, Flora Farm, Acre Resort, El Merkado dinners read with the heritage scarf or the Carla Fernández linen-and-rebozo dress.

The Marina Cabo San Lucas casual restaurants (Solomon's Landing, El Squid Roe, Cabo Wabo Cantina — the heritage Sammy Hagar bar since 1990) read Tommy Bahama (Florida-popular Hawaiian-shirt heritage) or local guayabera (the Mexican-Caribbean men's shirt — pleated front, four pockets, worn untucked). Skip the Cabo Wabo at evening if you don't like the spring-break-extension crowd; the Marina restaurants run more polished.
Cotton sundress · huaraches · sun hat · sunglasses · SPF 50 · crossbody · water bottle. Coffee at Doce Cuarenta (San José del Cabo) 7am, El Arco sunset cruise prep 10am, Médano Beach 11am.
Linen wide-leg trousers · Pineda Covalín scarf or Carla Fernández linen dress · pashmina or light cardigan · huaraches. Dinner at El Farallon (Pedregal cliff dining) 19:30 or Edith's 20:00; sunset at El Arco after.
A suggested look — Cabo San Lucas May morning look: coral cotton sundress or linen midi, cognac leather huaraches, wide-brim straw sun hat, tortoise sunglasses, small tan crossbody; no sunscreen.
Per SMN (Servicio Meteorológico Nacional) Los Cabos: average daily high 32°C (90°F), low 17°C (63°F), 0 rain days. Dry-Pacific shoulder season. UV index 11 (extreme). Sea of Cortez 23°C / 73°F. Daylight 13h 25m. Humidity 55% (dry compared to Cancún Caribbean's 75%). 12-knot Pacific trade winds. Pedregal hillside (200m / 660ft elevation) drops to 16-18°C / 61-64°F overnight. Spring break ends mid-April; May is calm before the June rate climb.
Not by Quintana Roo state law (which mandates reef-safe at Cancún cenotes and Sian Ka'an), but yes by reef-protection norm at the Pacific snorkel zones. The Cabo San Lucas operators at Santa María Cove (the heritage Cabo snorkel reserve) and Cabo Pulmo National Park (UNESCO marine reserve, the heritage Sea of Cortez reef, 100km / 62 miles north of San José del Cabo) enforce mineral-only sunscreens — zinc-based or titanium-dioxide. Pack: Stream2Sea, Sun Bum Mineral, Thinksport, Badger SPF 50. Mainland chemical sunscreens (oxybenzone-based) work at the Médano Beach resort pools but the snorkel operators turn back guests using them.
El Farallon (Cabo San Lucas, the heritage cliffside seafood restaurant at the Resort at Pedregal — the most-cited Cabo sunset fine dining) sits 90m / 300ft above the Pacific on the Pedregal cliffs. The menu: daily-caught Pacific seafood plated by the chef-de-cuisine; the heritage Champagne Terrace (since 2007) opens 30 minutes before sunset for the curated 100+ Champagne and sparkling-wine list. Reservations 6-8 weeks ahead in May; sunset seating books first. Dress code: business-casual minimum — linen wide-leg trousers + Pineda Covalín scarf or Carla Fernández dress + huaraches or block-heel sandals + pashmina for the post-sunset 17°C / 63°F drop. No swimwear, no shorts, no flip-flops. The cliff seating is uneven — block heels only.
Yes — El Arco (the iconic granite arch at Land's End where the Pacific meets the Sea of Cortez, the most-photographed Cabo landmark) is the heritage Cabo sunset destination. The recognized operators: Pisces Yachts (the heritage Cabo catamaran fleet), Cabo Adventures Luxury Sail, Caborey, La Princesa. Cruise duration 2 hours; departs 17:00 in May for the 18:30 sunset. Includes open bar, light dinner, sometimes live mariachi. Pack: linen wide-leg trousers + light blouse + pashmina + huaraches for women; chinos + linen button-down + light cardigan + leather sandals for men; sun hat, polarized sunglasses, SPF 50, light camera (the El Arco at sunset is the recognized photograph). Skip stilettos — boat decks; skip evening makeup — Pacific spray.
Resort-business-casual at the recognized restaurants — Edith's (Cabo San Lucas, the heritage Mexican-fusion fine dining, since 1985 — flambé tableside tradition); El Farallon (Pedregal cliffside seafood, the heritage Champagne Terrace); Flora Farm (San José del Cabo, the heritage organic-farm-to-table since 2009); Acre Resort (San José del Cabo, the heritage palm-grove farm restaurant); SUR Beach House (One&Only Palmilla); El Restaurante (Las Ventanas al Paraíso); Manta (the Cape, modern Pacific-Mexican); Comal (Chileno Bay Resort, modern Mexican by Yvan Mucharraz). Pack: linen wide-leg trousers + Pineda Covalín scarf + huaraches or block-heel sandals + pashmina for women; linen trousers + guayabera or button-down + leather loafers for men. No swimwear at evening, no flip-flops, no athleisure. Cabo dining 19:00-22:00 (later than mainland US).