London Weather
A month-by-month look at temperature, rainfall and what to pack in London. The annual average is 15°C high / 8°C low — hottest in July (23°C) and coldest in January (2°C).
London Weather at a Glance
As of 2026A quick summary of London's year-round climate and the best time to visit.
- Annual average
- 15° / 8°
- Best time to visit
- June, July, May
- Hottest month
- July (23°C)
- Coldest month
- January (2°C)
- Wettest month
- October (70mm)
- Driest month
- February (40mm)
As of 2026, London's weather averages 15°C high / 8°C low across the year, and the best time to visit for stable temperatures, rainfall and crowds is June, July, May. The hottest month is July (23°C), the coldest is January (2°C), and the wettest is October (70mm).
Best Time to Visit London
Peak London — sunshine through 9pm, parks full of picnickers, all major events running. Trooping the Colour (mid-June, the King's official birthday parade), Royal Ascot (Berkshire, 1 hour by train, the most prestigious horse-race meeting in the UK with strict morning dress code), Pride in London weekend (late June). Hotel prices at premium — book 3 months ahead.
Warmest month, peak tourist season. School holidays start mid-month — every museum jammed. Wimbledon Championships (Centre Court tickets via public ballot 6 months earlier OR queue overnight for £30 grounds tickets), BBC Proms at Royal Albert Hall (cheap £8 standing 'promming' tickets day of show). Heatwaves (37°C+) are increasingly common; hotels without AC become unbearable.
London's first sweet spot — long daylight (5am-9pm), mild temps, parks at peak. Two bank holiday Mondays (first and last Monday) push hotel prices up. Chelsea Flower Show is the cultural event — Royal Hospital Chelsea hosts the world's most prestigious garden show. May 1 marks the start of outdoor pub gardens being properly busy.
London Weather Month by Month
Tap any month for a detailed guide with what to wear, sunrise/sunset and air quality.
| Month | High/Low | Rain | Rainy days | Crowds | |
|---|---|---|---|---|---|
| January | 8° / 2° | 55mm | 11 | Quiet | Details → |
| February | 9° / 2° | 40mm | 9 | Quiet | Details → |
| March | 11° / 4° | 40mm | 9 | Moderate | Details → |
| April | 14° / 6° | 45mm | 9 | Moderate | Details → |
| May | 17° / 9° | 45mm | 8 | Busy | Details → |
| June | 20° / 12° | 45mm | 7 | Busy | Details → |
| July | 23° / 14° | 45mm | 6 | Very busy | Details → |
| August | 22° / 14° | 50mm | 7 | Very busy | Details → |
| September | 19° / 11° | 50mm | 8 | Busy | Details → |
| October | 15° / 8° | 70mm | 10 | Moderate | Details → |
| November | 11° / 5° | 65mm | 10 | Moderate | Details → |
| December | 8° / 3° | 55mm | 11 | Very busy | Details → |
What to Wear in London by Season
Trench coat or denim jacket + sweater. Daytime can hit 18°C; evenings drop to 8°C. Compact umbrella essential. Cherry blossoms in Greenwich Park and Regent's Park peak mid-April.
T-shirts and shorts/skirts. Light jacket for evenings (still chilly to 12-15°C). Heatwaves (rare but climbing 30°C+) catch the city off-guard — most hotels and the entire Tube system lack air conditioning.
Wool coat by mid-month, scarf, umbrella. Boots over sneakers for wet pavements. Long evenings start to shrink — clocks back last Sunday.
Same as January — wool coat, scarf, gloves. Add waterproof outer if forecast shows multiple rain days. Chinese New Year parade brings outdoor crowds; dress warm.
London Weather FAQ
What is the best time to visit London? +
For weather, June, July, May are the most comfortable months. Highs sit around 20°C with relatively stable rainfall and crowds.
What are the hottest and coldest months in London? +
The hottest month is July with an average high of 23°C, and the coldest is January with an average low of 2°C. The annual average is 15°C high / 8°C low.
When does it rain most in London? +
The wettest month is October (70mm over about 10 rainy days) and the driest is February (40mm). Total annual rainfall is roughly 605mm.
What should I pack for London? +
Spring (Mar–May) averages 14/6°C — Trench coat or denim jacket + sweater. Daytime can hit 18°C; evenings drop to 8°C. Compact umbrella essential. Cherry blossoms in Greenwich Park and Regent's Park peak mid-April. Summer (Jun–Aug) averages 22/13°C — T-shirts and shorts/skirts. Light jacket for evenings (still chilly to 12-15°C). Heatwaves (rare but climbing 30°C+) catch the city off-guard — most hotels and the entire Tube system lack air conditioning. Autumn (Sep–Nov) averages 15/8°C — Wool coat by mid-month, scarf, umbrella. Boots over sneakers for wet pavements. Long evenings start to shrink — clocks back last Sunday. Winter (Dec–Feb) averages 8/2°C — Same as January — wool coat, scarf, gloves. Add waterproof outer if forecast shows multiple rain days. Chinese New Year parade brings outdoor crowds; dress warm.
What is the weather in London this month (June)? +
June averages 20°C high / 12°C low with 45mm rainfall over about 7 rainy days. Crowds are busy and prices are high.
Keep Planning Your London Trip
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.