London rewards visitors year-round, but what you experience depends enormously on when you arrive. A summer visit means long golden evenings in parks, open-air cinema, and rooftop bars. A winter visit means cosy pubs, world-class museums, and, in December, one of the most atmospheric Christmas atmospheres in Europe. The weather shapes every version of the trip.

Here is a month-by-month breakdown of what the weather in London actually looks like — and what it means for your visit.

May to September: The Prime Season

This is when London is at its most inviting. Temperatures climb from 18°C in May to a peak of around 23°C in July and August, with long daylight hours (sunset as late as 9:30pm in June) that transform the city. Parks become social hubs, outdoor markets thrive, and events from Wimbledon to outdoor music festivals define the calendar.

July is statistically one of the drier months (around 37mm of rain) but "drier" is relative — showers remain possible on any day, and the legendary British heatwave (when temperatures briefly exceed 30°C) is increasingly common in recent years. Always carry a compact umbrella regardless of the forecast.

September is arguably underrated. School holidays are over, crowds thin, hotel prices drop slightly, and early autumn warmth (often 20°C or higher) combines with golden light for genuinely beautiful conditions.

December: Cold, But Magical

London in December is cold (average 8°C), wet, and dark — but the festive atmosphere is exceptional. Christmas lights on Oxford Street and Regent Street, markets at Hyde Park and South Bank, and the general buzz of a world capital celebrating the season make it worth braving the chill. Pack a proper winter coat, waterproof boots, and a scarf.

January and February: The Quiet Season

These are London's most challenging months — short days, frequent rain, cold temperatures (2–9°C), and a post-Christmas quietness. But museums are empty, hotel prices are at their lowest, and if you love London for its culture, galleries, and theatre scene, January offers all of that with virtually no queues.

March and April: The Awakening

Spring in London is a genuine pleasure. Cherry blossoms appear in late March, parks turn green, and the city emerges from winter hibernation. Weather remains unpredictable — "April showers" is a phrase that earned its reputation — but warm, bright days become increasingly common. A medium jacket with a packable waterproof shell is the ideal kit.

What to Pack for London

  • All seasons: A compact foldable umbrella. Non-negotiable.
  • Summer (Jun–Aug): Light clothes, layers for evenings, sunscreen for rare sunny spells
  • Spring/Autumn (Mar–May, Sep–Nov): Medium jacket, waterproof outer layer, comfortable walking shoes
  • Winter (Dec–Feb): Heavy coat, thermal layers, waterproof boots, scarf and gloves

Check the live SunorSnow dashboard before you leave or during your trip for up-to-the-minute London conditions. For long-term planning, the London climate guide has full monthly data.