UK · Climate data from the UK Met Office
London dresses for a 9°C–24°C / 48°F–75°F window across the months we cover. London is damp and variable, and the locals dress for it without sacrificing the look. Expect a lot of tailoring, a lot of boots, a lot of waterproofing disguised as something else. The city rewards a packable jacket and a healthy distrust of the morning forecast.
Across the 4 months we cover: morning lows from 9°C / 48°F (May) to afternoon highs of 24°C / 75°F (July).
What to wear in London in May 2026 guide: Met Office climate data (19°C / 66°F high, 8 rain days) and a trench-and-layers capsule tested against unreliable British spring.
What to wear in London in June 2026 guide: Met Office climate data (21°C / 70°F high, 8 rain days, 199 sunshine hours) and a bright-but-prepared capsule for 16.5-hour days.
What to wear in London in July 2026: Met Office data (24°C / 75°F, 36mm rain, 209 sunshine hours) — the warmest month, with a capsule that still carries a jacket.
What to wear in London in August 2026: Met Office data (23°C / 73°F, 8 rain days, 198 sunshine hours), a late-summer capsule for Notting Hill Carnival and heat waves.
The neighborhood you sleep in affects what reads as appropriate more than the calendar does. London's style scene anchors on the districts below — each leaf page calls out the local register (smart-casual, undone, technical, party) so the capsule maps to the streets you'll actually walk on.
Every leaf page on this hub is built from four data layers: climate normals from the UK Met Office; named-authority etiquette and style references (Vogue, Condé Nast Traveler, Business of Fashion, the relevant local press); resident write-ups and traveler-forum reports for the failure modes tourists get wrong; and the editorial avatar pool that visualises each capsule on a person rather than a moodboard. Every DO names a reason. Every DON'T names a failure mode. We retest before each seasonal refresh — the editorial-modified date at the bottom of each leaf is the receipt.
Climate numbers come from the UK Met Office — the national meteorological service for UK. Daily highs and lows, rain days, and daylight hours are 1991-2020 normals (the international standard, refreshed every decade). Capsule pieces and what-to-avoid notes are stress-tested against London resident write-ups, named-stylist sources where the city has a documented uniform (Vogue Paris under Emmanuelle Alt for Paris, Vogue Japan and i-D Tokyo coverage for Tokyo, NYMag's The Cut for New York), and the failure modes locals actually flag in city forums and traveler reports.
Because the morning-low to afternoon-high swing inside one London month already changes the silhouette — and the swing between months is much bigger than that. May mornings start at 9°C / 48°F; July afternoons hit 24°C / 75°F. A single packing list that tries to span both ends up wrong at both. Each month here is a different capsule, calibrated to the climate band that actually shows up on the ground.
4 so far: May, June, July, August. We ship climate-and-event-distinct months only — adjacent months that share more than 60% of the same capsule pieces don't get separate pages, because near-identical leaves erode the credibility of every other page on the site. The full coverage plan is in our internal CLAUDE.md (the editorial brief governs every page that ships).
the UK Met Office 1991-2020 normals are the version cited on every leaf — the international meteorological standard, updated by every national service every decade. We restate the numbers as raw averages on the leaf pages ("24°C / 75°F afternoons") rather than the year range, so the figures don't read as stale. The next normals refresh covers 2001-2030 and lands in 2031 — we'll bump every page when it does.
Editorial rule, enforced in CI: every DO line names a specific reason ("merino sinks under a trench so a damp morning doesn't show through your knit"); every DON'T names a specific failure mode ("suede stains the first time light drizzle catches it"). We ban "timeless," "elevate your style," "must-have," and "effortless" — they're the giveaway phrases of generic AI fashion writing. If a sentence could open any city's guide, it gets cut. London's guide reads like London, not like a packing-list aggregator.