London in June: 21°C / 70°F afternoons, 12°C / 54°F mornings, 8 rain days, 16.5 hours of daylight — sunsets past 9pm.
June is London's long-light month. Met Office climate data put the afternoon high at 21.4°C / 71°F and morning at 12°C / 54°F, with only 8 rain days and 16.5 hours of daylight — sunsets past 9pm, parks in full green, Wimbledon starting late in the month. Do not be fooled by the word summer: the average afternoon is 21°C / 70°F, occasionally warmer in a heatwave, but evenings still drop to 12°C / 54°F and rain appears on about a quarter of days. The key is a capsule that leans into the optimism (a dress, a sandal, a bare arm) while keeping the realism close (a jacket in the bag, a layer at the waist, shoes that survive a wet Tube station floor). A classic London rule still holds: 'infamously cold in the summer (unless there's a heat wave), and rain is almost always in the forecast.' Pack the trench; you'll use it.
Infamously cold in the summer (unless there's a heat wave), and rain is almost always in the forecast — pack the trench; you'll use it.

A practical 12°C / 54°F morning and Tube-draft layer without May's heavier trench.

June's workhorse for pub gardens, park afternoons, and a smart-casual dinner.

A detailed warm-afternoon top that still looks polished under denim.

For cooler days and evening plans that need more than a dress. Linen wrinkles are acceptable; stiff chinos are not.

A bridging layer for pub-garden shade, late sunsets, and cool museum galleries.

An all-day walking pair for cobblestones, markets, and the Tube.

June's warm-day and evening alternative to closed shoes.

A compact summer bag for Columbia Road Flower Market and pub gardens.

A market-day carryall with room for a rolled jacket.

A hands-free evening bag for Hampstead and Primrose Hill.

For bright 16.5-hour days and late-evening sun.

A bag-size rain plan for Wimbledon and sudden June drizzle.
White blouse · linen trousers · Vans · denim jacket · canvas tote. Columbia Road Flower Market on Sunday, brunch in Hackney.
Midi dress · cardigan · flat leather sandals · crossbody. Pub garden in Hampstead, 9pm sunset walk on Primrose Hill.
Per Met Office climate data: average high 21.4°C (71°F), low 12°C (54°F). About 8 days with rain totalling ~49mm, plus 199 hours of sunshine. Daylight stretches to 16.5 hours — the longest of any month. Heat waves occasionally push afternoons above 28°C / 82°F.
Mildly warm. Average highs around 21°C / 70°F with occasional days reaching 25°C / 77°F or more in a heat wave. Not hot by global standards, but warm enough for bare arms most afternoons. Evenings cool quickly after 9pm; a layer is essential.
Smart casual with a nod to tradition: a blazer or nice dress, comfortable shoes (you'll sit and walk a lot), a hat for the sun, and absolutely a rain layer. Wimbledon and rain are famously inseparable — every bag has an umbrella and a pac-a-mac.
Yes, on dry warm days. Keep a closed-toe option (Vans, Chelsea boots, loafers) for rainy mornings and cooler evenings. The transition between sandal weather and boot weather can happen within a single day in June London.
A light water-resistant layer, yes. June averages 8 rain days — less than May but enough that a trench or lightweight anorak saves the outfit. A packable rain shell that rolls into a bag is the London travel classic.