London has a mild, famously unpredictable maritime climate — rain is possible in any month, and temperature swings are gentler than most of continental Europe. Timing matters more for crowds and prices than for weather extremes.

Quick answer: April–June and September offer the best balance of weather and crowds. July–August is peak season with the highest prices. December has Christmas markets and lights but is cold and busy. January–February is coldest and cheapest.

🌸 Spring (April – June)

The best all-round window to visit. Temperatures run 10–19°C, the parks are in bloom, and crowds are lighter than summer. Late May and June bring long daylight hours — ideal for evening walks along the South Bank or through Hyde Park.

☀️ Summer (July – August)

Warm (18–24°C) and the busiest, most expensive time to visit. School holidays bring the year's largest crowds to major museums and sights, and hotel prices peak. Book the Tower of London, Harry Potter Studios and any West End shows well in advance if travelling now.

🍂 Autumn (September – October)

Arguably the sweet spot alongside spring — mild temperatures, noticeably thinner crowds than summer, and the city's cultural calendar (theatre, exhibitions) back in full swing after the summer lull. September in particular offers excellent value.

❄️ Winter (November – March)

Cold (2–9°C) and often grey, but London's Christmas lights on Oxford Street and Regent Street, plus the Winter Wonderland in Hyde Park, are genuinely festive. Hotel prices drop significantly in January and February outside the holiday period, making these the cheapest months to visit if weather isn't a priority.

📊 Month-by-month snapshot: Apr–Jun: mild, blooming parks, moderate crowds. Jul–Aug: warm, peak crowds and prices. Sep–Oct: mild, thinner crowds, best value. Nov–Dec: cold, Christmas lights and markets. Jan–Feb: coldest, cheapest, quietest.

🎉 Key Dates to Know

Notting Hill Carnival: August bank holiday weekend — Europe's largest street festival, with the Notting Hill area completely transformed. Book accommodation well ahead if visiting during this weekend.

Christmas lights & markets: Late November through early January — Oxford Street, Regent Street and Winter Wonderland in Hyde Park are the highlights, though this is also one of the busier and pricier periods.

Wimbledon: Late June/early July — tennis fever grips the city, and accommodation in South West London gets scarce and expensive during the tournament.

❓ FAQs

What is the rainiest month in London?

Rain is fairly evenly spread across the year, with no single dramatically wetter month. Pack for rain regardless of when you visit — a compact umbrella is essential in every season.

Is London worth visiting in winter?

Yes — the Christmas lights and markets are a genuine highlight, hotel prices are at their lowest in January/February, and the free museums are just as good regardless of season.

Should I avoid visiting during school holidays?

If you can, yes — UK and European school holidays (particularly July–August and around Christmas) bring the year's biggest crowds to major museums and attractions, along with the highest hotel prices.