Prague in May: 21°C / 70°F afternoons, 11°C / 52°F mornings, 9 rain days — Prague Spring music festival opens mid-month.
May in Prague is late spring transitioning into summer. ČHMÚ (Czech Hydrometeorological Institute) data put afternoons at 21°C / 70°F, mornings at 11°C / 52°F, 9 rain days totalling ~75mm, and 15 hours of daylight by month-end. The wardrobe register is bohemian-classical: fine-knit sweater, cotton long-sleeve base, packable trench, dark straight-leg jeans or wool-blend trousers, low-heel leather boots or oxfords. The Prague Spring (Pražské jaro) music festival opens May 12 with Bedřich Smetana's Má vlast at Obecní dům, running through early June with Czech Philharmonic, Prague Symphony, and international guests at Rudolfinum and Smetana Hall. Local design vocabulary: Klára Nademlýnská (Prague-based contemporary, since 1996), Liběna Rochová (Czech avant-garde), Jakub Polanka (heritage), Lobmeyr (glass-and-luxury, founded 1823 in Vienna with strong Prague-historical ties), Moser (Bohemian crystal, founded 1857 Karlovy Vary). Old Town and Lesser Town cobblestones — much of the network laid by Charles IV in the 14th century — punish stilettos and thin soles. Bata (Czech-founded shoe heritage) plus Vagabond and Common Projects all read Prague-appropriate.
Prague's Old Town cobbles are 14th-century — Charles IV laid much of the network in 1357 — and they punish stilettos in a way only six centuries of stone can.

The Prague May base layer. Margaret Howell, COS, or Czech-local Klára Nademlýnská. Layers under the trench, alone in 21°C / 70°F afternoons.

The under-layer that handles 11°C / 52°F mornings and 21°C / 70°F afternoons. Sunspel, COS, or Pietro Filipi (Czech).

May in Prague brings 9 rain days. A Burberry trench, Akris, or accessible COS handles the rain plus the cool morning. Belt-it for the formal register; tie-it-back for casual café walks.

Cobble-friendly. Skip skinny — Prague's 14th-century stone network catches thin heels and tight cuffs equally. Closed (German-Czech), A.P.C. New Standard, or Lemaire pleated trouser.

The Prague shoe. Bata (Czech-founded heritage), Vagabond, Dr. Martens 1461, or Common Projects oxfords. Skip stilettos universally on Old Town cobbles.

9 rain days. A Stutterheim or Patagonia Torrentshell rolls into the bag; Prague locals also carry compact umbrellas (the city's covered passages — Lucerna, Koruna — handle some rain too).

Prague's editorial register reads structured-leather over slouchy. Mansur Gavriel, Strathberry, or local Czech leatherworker Vasky. Skip the canvas tote outside actual bookshop runs to Globe.

11°C / 52°F mornings need a layer at the throat. Wool or silk; Lobmeyr-aesthetic muted tones (cream, burgundy, deep navy) over loud patterns. Skip logo-printed scarves.
Cotton long-sleeve · fine-knit sweater · jeans · low-heel boots · trench · scarf · structured bag. Coffee at Café Savoy or EMA Espresso Bar 9am, walk Old Town Square 10am, lunch at Eska (Karlín).
Cotton blouse · wool trousers · low-heel oxfords · trench · structured bag. Dinner at La Degustation Bohême Bourgeoise (Michelin) 7:30pm, then Smetana Hall or Rudolfinum 8pm for Prague Spring concerts.
A suggested look — Prague May morning look: cream fine-knit sweater over cotton base, dark straight-leg trousers, low-heel ankle boots, camel trench, muted scarf.
Per ČHMÚ (Czech Hydrometeorological Institute) data: average daily high is 21°C / 70°F, low is 11°C / 52°F, 9 rain days totalling ~75mm. Daylight stretches to 15 hours by month-end. May is Prague's wettest spring month — afternoon showers hit with little warning. Mornings start cool at 11°C / 52°F (wool layer needed); afternoons reach 24-26°C / 75-79°F on the sunniest days but drop to 16°C / 61°F under cloud.
Prague Spring (Pražské jaro) is the city's annual classical music festival, opening May 12 (the death anniversary of Bedřich Smetana, founded 1946) with Smetana's Má vlast (My Country) at Obecní dům's Smetana Hall. The festival runs through early June with Czech Philharmonic, Prague Symphony, and international orchestras at Rudolfinum (Dvořák Hall), Smetana Hall, and St. Vitus Cathedral. Pack: a smart-casual evening look — wool trousers, cotton blouse, low-heel oxfords or pumps, a structured bag — for the front-row Lobmeyr-and-Loro-Piana register.
Low-heel leather boots, oxfords, or loafers with a real outsole. Bata (Czech-founded shoe heritage, since 1894), Vagabond, Dr. Martens 1461, Common Projects oxfords, or Geox for the rain-resistant register all work. Skip stilettos universally — Old Town's 14th-century cobble network (laid much by Emperor Charles IV in 1357) catches thin heels. Skip flip-flops in Lesser Town and Castle District; the climb to Prague Castle is steep cobble. Skip pure athletic running shoes outside actual hiking — Czech dress culture reads quiet leather over technical sneaker.
Klára Nademlýnská (Prague flagship since 1996, Dlouhá street, contemporary Czech), Liběna Rochová (avant-garde Czech), Pietro Filipi (Czech contemporary, multiple Prague locations), Bata (Czech-founded shoe heritage on Wenceslas Square), Vagabond and Geox for international shoes, Lobmeyr (Vienna-Prague crystal-and-luxury since 1823) and Moser (Bohemian crystal since 1857) for accessories. Pařížská street holds the international luxury register (Hermès, Dior, Loro Piana). Vinohrady and Karlín hold Czech contemporary boutiques.
Among the best European May destinations. Prague Spring music festival opens May 12 and runs through early June; weather is pleasant if changeable (9 rain days but sunny stretches), tourist crowds are moderate compared to peak July-August, and Czech beer-garden culture (U Vejvodů, U Pinkasů, Letná Beer Garden) opens for the season. Trade-offs: rain hits without warning so a packable trench is essential, smaller restaurants outside Old Town keep reduced spring hours, and Prague Castle entry queues run 30-60 minutes on Saturday mornings.