What’s in This Article
- Key Takeaways
- January: Cold and Crisp
- February: The Last of Winter’s Chill
- March: Signs of Spring
- April: Showers and Blooming Flowers
- May: Warmer Days and Longer Evenings
- June: Early Summer Warmth
- July: Peak Summer Temperatures
- August: Warm and Occasionally Humid
- September: Transition Into Autumn
- October: Cooler Days and Fall Foliage
- November: Darker Days and Cosy Indoor Plans
- December: Festive Lights and Winter Weather
- Best Time to Visit London
- What to Pack for London Weather
- Frequently Asked Questions
London’s weather can fool you at any time of year. Sunny mornings turn into wet afternoons, and mild winters can suddenly shift to cold snaps with little warning. This guide breaks down what to expect each month, from temperatures and rainfall to the best days for outdoor plans.
Note: The temperature, rainfall, and sunshine figures below use Met Office long-term averages for Heathrow (1991–2020) as a practical London reference point. Central London can be a little warmer.
Quick Answer
London has mild, changeable weather all year. Average summer highs reach 22–24°C with long days, while winters stay cool at around 8–9°C with grey, damp spells. Rain falls fairly evenly across all 12 months, so a light waterproof layer is useful no matter when you visit.
Key Takeaways
Key Takeaways
- London is mild but unpredictable all year. Pack layers and a light rain jacket in every season.
- Summer has the longest days and the most sunshine, but quick showers and humid spells still happen.
- Autumn and winter bring short daylight and more damp days, so mix in indoor plans alongside outdoor visits.
- July is typically the warmest and sunniest month, with average highs around 24°C.
- Always check a short-range forecast before heading out. London’s weather can change within hours.
January: Cold and Crisp
January feels like classic London winter. Days are short and often grey, with occasional bright, crisp spells. Those clear moments are great for a brisk walk along the Thames or through Hyde Park or Regent’s Park.
According to Met Office long-term data, typical daytime highs sit around 8°C, with nights near 3°C. Drizzle is common, so keep an umbrella handy. After a cold day outside, London’s cafes and pubs are an easy place to warm up.
February: The Last of Winter’s Chill
February still has winter’s bite, but the city starts to inch toward spring. Daytime highs are often around 9°C, and nights sit near 3°C. Cold snaps can bring sharp winds through the streets.
Rain comes often, as drizzle or light showers. Some mornings turn foggy too. Days get a little longer, but it still feels wintry most of the time.
March: Signs of Spring
March brings the first real hints of spring. You’ll see longer days, more breaks of sun, and early buds in the parks. It can still feel cool, especially in the morning.
| Weather Feature | Typical Details |
|---|---|
| Temperature Range | Highs around 11–12°C; lows around 4–5°C |
| Sunshine | Often 3–5 hours a day on average |
| Rainfall | Light showers, occasional drizzle |
By late March, outdoor plans feel easier, but it’s still smart to dress in layers.
April: Showers and Blooming Flowers
April is famous for showers, and London earns that reputation. The upside is that parks and gardens look great. You’ll see spring colour everywhere, especially in the larger green spaces.
April Rainfall Patterns
April weather can change fast. Showers often arrive in short bursts, so an umbrella helps. Across the month, rainfall runs around 40–45mm, with a mix of drizzle and heavier downpours.
Blooming Spring Flowers
As rain feeds the soil, London’s parks and gardens brighten up. Tulips, daffodils, and hyacinths are common highlights in April.
Best Outdoor Activities in April
You can still enjoy plenty of outdoor time in April. Try a market visit, a riverside walk, or a park stroll between showers.
| Activity | Location | What You’ll Get |
|---|---|---|
| Flower Viewing | Kew Gardens | Spring blooms at their peak |
| Picnicking | Hampstead Heath | Open space with city views |
| River Walks | Thames Path | Scenic riverside route with easy stops |
May: Warmer Days and Longer Evenings
May is one of the easiest months for exploring on foot. Days are warmer and evenings stay light for longer. Parks, streets, and outdoor cafes fill up fast when the sun is out.
Average daytime highs are around 18°C, with nights closer to 9°C. Rain is still possible, but it’s often less persistent than in early spring.
Note: UK bank holidays fall in May, which can make popular parks and outdoor markets busier than usual on those days.
June: Early Summer Warmth
June brings early summer weather and long days. Daytime highs average around 22°C and nights around 12°C. It can feel cooler near the river or after rain.
What to Expect on Warm June Days
Many June days are bright and mild. It’s a great time for parks, gardens, and day trips out of the city.
Occasional Rain Showers
Showers still pop up in June. They’re often brief and followed by clearer skies, so a compact umbrella is worth keeping in your bag.
Longer Daylight Hours
Near the summer solstice, sunrise comes at roughly 4:45 AM and sunset at around 9:20 PM. That gives you plenty of daylight for sightseeing from early morning to late evening.
July: Peak Summer Temperatures
July is usually London’s warmest month. Average daytime highs are around 24°C, and heatwaves can push temperatures above 30°C. Plan shade breaks, drink water, and wear lighter clothes in the middle of the day.
Thunderstorms can roll through after humid spells, which cool things down fast.
Pro tip: Check the hourly forecast on warm July afternoons — thunderstorms can build quickly and pass within an hour, so timing outdoor plans around them is easy.
August: Warm and Occasionally Humid
August stays warm, with daytime highs around 23°C and mild nights near 14°C. Some days feel muggy when the air is still.
Rainfall can be hit-or-miss. You might see a quick shower, then sun again. Evenings are often comfortable for outdoor dining or a river walk.
September: Transition Into Autumn
September is a gentle step toward autumn. Daytime highs average around 20°C, and nights cool to around 12°C. Mornings and evenings feel crisp compared with August.
Rain becomes a bit more common again, usually as light showers. Parks also start to show the first signs of colour change.
October: Cooler Days and Fall Foliage
October feels cooler and more autumnal. Daytime highs are often in the mid-teens Celsius early in the month, then trend down. Rain comes more often, so a small umbrella is useful.
| Early October | Mid to Late October |
|---|---|
| Cooler mornings | Brisker evenings |
| Showers become more common | Leaves peak in colour |
| Mild daytime temps | More layers needed |
| Foliage intensifies | Early winter feel on some days |
The changing leaves make London’s parks especially photogenic in October.
Pro tip: Mid-to-late October usually brings the best autumn colour in London’s parks. Kew Gardens, Hampstead Heath, and Richmond Park are worth the trip.
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November: Darker Days and Cosy Indoor Plans
November leans into late autumn. Days are shorter and damp spells are common. Daytime highs are often around 12°C, with nights near 5°C.
This is a good month to mix outdoor walks with indoor plans. Think museums, theatres, markets, and long pub lunches when rain sets in.
Products Worth Considering
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December: Festive Lights and Winter Weather
December feels wintry, even if extreme cold is uncommon. Daytime highs average around 9°C and nights around 3°C. With very short daylight, it helps to do outdoor sightseeing earlier in the day.
Snow can fall, but it often comes as a brief dusting or sleet. Whether it settles varies a lot by year and by neighbourhood.
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Best Time to Visit London
May, June, and September tend to offer the best balance of warm weather, long days, and fewer peak-season crowds. July and August are the warmest months but attract the largest numbers of visitors, which means busier attractions and higher prices.
Spring (March to May) suits outdoor exploring well, with blooming parks and rising temperatures. Winter is quieter and more affordable, but daylight hours are short and outdoor plans need more flexibility.
If warm weather is your priority, aim for June to August. If you want a mix of good weather and a calmer city, May or September hit that balance well.
What to Pack for London Weather
The single most useful thing to pack for any London trip is a light, waterproof layer. Beyond that, your kit depends on the season.
- Winter (December–February): Warm coat, scarf, gloves, waterproof shoes, and a compact umbrella.
- Spring (March–May): Medium-weight jacket, waterproof layer, and comfortable walking shoes. Temperatures vary day to day.
- Summer (June–August): T-shirts and light layers, a compact rain jacket, and sunscreen for warm spells.
- Autumn (September–November): Medium-weight jacket, umbrella, and extra layers for cooler evenings.
Frequently Asked Questions
What Is the Average Annual Rainfall in London?
London’s annual rainfall is modest for the UK. Long-term averages for Heathrow (commonly used as a reference for London) sit at about 615mm per year, according to Met Office climate data. Rain spreads across all seasons rather than falling mostly in one period.
What Is the Rainiest Month in London?
No single month stands out as dramatically wetter than the others. Met Office data shows monthly rainfall at Heathrow stays broadly similar across the year, with slightly higher totals in October and November. What changes more than total rainfall is the type of rain: winter brings persistent drizzle, while summer tends toward shorter, heavier showers.
How Often Does Snow Occur in London?
Snow can happen in London most winters, but it often melts quickly, especially in central areas. When it does fall, it’s most likely between December and March. Significant snowfall that disrupts travel is less common in central London than in other parts of the UK.
When Is the Sunniest Month in London?
July tends to be the sunniest month in London on average, with the highest total sunshine hours. June runs close behind, thanks to long daylight hours around the summer solstice.
What Are the Coldest Temperatures Recorded in London?
Very cold spells are rare but possible. In the wider England South East and Central South district that includes London, the lowest recorded daily minimum temperature is −19.5°C, set on 14 January 1982. Within London itself, exact records vary by station, but sharp frosts can occur during severe winter spells.
How Does Humidity Vary Throughout the Year?
London often feels damper in cooler months, when cloud and drizzle are more common. Summer is often more comfortable, but muggy days can happen during warm spells, particularly in July and August when the air is still.
Plan Ahead and Stay Flexible
London’s weather shifts every season, but that’s part of what makes it worth exploring at any time of year. The key is to plan a mix of indoor and outdoor activities, check the short-range forecast before heading out, and keep a waterproof layer within reach. Do that, and the weather rarely has to derail your day.
References
- UK Climate Averages — Heathrow — Met Office, 1991–2020 baseline
- Regional Climate: South East and Central South England — Met Office