London Weather in July

Last Updated on July 27, 2026 by Daniel Globe

Planning a trip to London in July means preparing for warm summer afternoons, mild evenings, long daylight hours, and the chance of occasional rain. July is typically one of London’s warmest and sunniest months, but individual days can range from cool and cloudy to hot and humid. A light layering system, comfortable walking shoes, sun protection, and a compact waterproof layer will cover most conditions.

Typical Temperature Range and Climate Conditions

July is normally one of London’s warmest months. According to the Met Office’s 1991–2020 averages for Kew Gardens, the average daily maximum is 23.78°C (74.8°F), while the average minimum is 13.19°C (55.7°F).

Those figures are long-term averages, not a forecast. A particular July week may be noticeably cooler, warmer, wetter, or drier. Ordinary afternoons often feel pleasantly warm, but heatwaves can push temperatures well above the monthly average and sometimes above 30°C (86°F).

Evenings are usually mild, although a light cardigan, overshirt, or thin jacket can feel useful after sunset, especially after a cooler or rainy day.

Average Sunshine and Daylight Hours

July gives visitors plenty of daylight for sightseeing. London remains close to its annual daylight maximum at the start of the month, so early mornings and late sunsets can make a sightseeing day feel much longer than it would in winter.

Sunshine and daylight are not the same thing. Daylight measures the time between sunrise and sunset, while sunshine hours measure periods when direct sunshine reaches the observing station.

Sunshine Duration Trends

Met Office 1991–2020 data for Kew Gardens records about 221.9 hours of sunshine during an average July. Divided across the month, that is roughly 7.2 sunshine hours per day, but real weather does not distribute those hours evenly. One day can be bright for hours while another is mostly cloudy.

July 2026	Sunrise	Sunset	Daylight
July 1	4:47 a.m.	9:20 p.m.	16 hr 33 min
July 15	5:00 a.m.	9:11 p.m.	16 hr 10 min
July 31	5:22 a.m.	8:50 p.m.	15 hr 28 min

The exact sunrise and sunset times change slightly each year, but the seasonal pattern is the same: July begins with exceptionally long days, then daylight gradually decreases as the month progresses.

Peak Daylight Hours

London’s longest days occur around the June summer solstice, not in mid-July. July still provides roughly 15.5 to 16.5 hours of daylight, depending on the date, which leaves plenty of time for parks, walking tours, riverfront sightseeing, outdoor dining, and evening activities.

July gives London visitors some of the year’s longest sightseeing days, even though daylight is already gradually shortening after the June solstice.

Cloud Cover Patterns

Cloud cover can change throughout the day. A morning may begin gray and become sunny, or a bright afternoon may turn cloudy as a shower approaches. That makes fixed daily sunshine predictions less useful than the current forecast.

Do not assume clouds eliminate sun exposure. The NHS notes that sunburn can occur in the UK even when it is cloudy. Check the UV index and use sun protection when needed.

Prevalence of Rain and Weather Variability

Rain is part of London’s summer climate, but July should not be described as continuously wet. Kew Gardens averages about 45.2 mm of July rainfall and 7.6 days with at least 1 mm of rain.

That means a visitor should be prepared for showers without assuming every day will be rainy. Some July periods are largely dry, while other weeks may bring several showers or thunderstorms.

Showers and Occasional Drizzle

July rain can arrive as light showers, steadier rain, or occasional heavier downpours. A shower may pass quickly, allowing outdoor plans to continue soon afterward.

A compact umbrella or lightweight waterproof jacket is usually more practical than heavy rain gear. Water-resistant walking shoes can also help if you plan to spend most of the day outside.

Temperature Fluctuations Are Common

A July day may begin cool enough for a light layer and become warm by afternoon. Cloud, rain, wind, and sunshine can all change how the temperature feels.

Instead of dressing for one number, wear a breathable base layer and carry one light outer layer. This is especially helpful when moving between sunny streets, shaded parks, air-conditioned attractions, and cooler evenings.

Unpredictable Weather Patterns

London’s maritime climate allows weather systems to change fairly quickly. A forecast showing sunshine for much of the day can still include a brief shower, while an overcast morning does not necessarily mean the afternoon will stay gray.

The Met Office National Severe Weather Warning Service can issue warnings for hazards including rain, thunderstorms, wind, lightning, and extreme heat. Check current warnings when severe weather is forecast rather than assuming July conditions will always be mild.

How to Prepare for Changing Weather

The easiest way to handle London’s July weather is to pack light layers and keep one or two weather-specific items in your day bag. Heavy winter clothing is unnecessary for typical conditions.

Weather Type	Clothing Tips	Useful Items
Sunny / warm	Breathable shirt, shorts, skirt, dress, or lightweight trousers	Sunscreen, sunglasses, hat, water bottle
Rainy	Light waterproof outer layer	Compact umbrella, water-resistant shoes
Cool evening	Light cardigan, overshirt, or thin jacket	Packable layer
Hot spell	Loose, lightweight clothing	Water, sunscreen, hat, portable fan if useful

For sun protection, the NHS recommends at least SPF 30 sunscreen and advises taking extra care when the UV index is 3 or higher. In the UK, the sun is generally strongest between 11 a.m. and 3 p.m. from March through October.

In England, the UK Health Security Agency Heat-Health Alerting system operates through the summer and uses yellow, amber, and red alert levels when forecast heat could affect health.

Best Times for Outdoor Activities and Events

On mild or cloudy July days, you can comfortably explore London throughout the day. During hot and sunny weather, early morning and later afternoon are often more comfortable for long walks, parks, outdoor markets, and other activities that keep you in direct sun.

If you will be outside around midday, use shade, wear sun protection, and take indoor breaks. The NHS identifies roughly 11 a.m. to 3 p.m. as the period when the UK sun is strongest during spring and summer.

London’s long evenings give you flexibility. Parks, river walks, viewpoints, outdoor dining, and neighborhood exploration can often continue well into the evening without sacrificing daylight.

For days with showers in the forecast, avoid building an itinerary that depends entirely on outdoor attractions. Pair outdoor stops with museums, galleries, covered markets, shops, or cafés nearby.

Comparing July With Other Summer Months

July is typically a little warmer than June and very similar to August. Using the same Met Office 1991–2020 Kew Gardens dataset makes the comparison more meaningful.

Month	Avg. Max	Avg. Min	Rainfall	Sunshine
June	21.4°C	11.0°C	49.7 mm	209.8 hr
July	23.8°C	13.2°C	45.2 mm	221.9 hr
August	23.4°C	13.0°C	55.1 mm	206.5 hr

These averages show why July is a popular sightseeing month: it combines warm temperatures with high average sunshine and long days. June has slightly cooler temperatures and even longer daylight near the solstice, while August remains almost as warm but has somewhat less average sunshine and more rainfall at Kew.

Tourist crowds and accommodation prices depend on school holidays, events, demand, and booking dates, so weather alone should not be used to predict how busy or expensive London will be.

Tips for Packing and Dressing Appropriately

For most July trips, start with lightweight, breathable clothing such as T-shirts, shirts, dresses, skirts, shorts, or light trousers. London is a walking-heavy destination, so comfortable shoes matter more than packing a large number of outfits.

Add one cardigan, overshirt, or lightweight jacket for cooler evenings and cloudy days. A thin waterproof shell or compact umbrella covers most ordinary summer showers without taking much luggage space.

Bring sunglasses, a hat, and sunscreen for bright days. A reusable water bottle is also useful, particularly during hot weather or when you plan to walk for several hours.

Before leaving your accommodation each morning, check three things: the hourly rain forecast, the expected maximum temperature, and the UV index. That is more useful than dressing only from the monthly average.

Frequently Asked Questions

Are There Any Major Weather-Related Events in London During July?

Weather hazards are not scheduled events, but July can bring heatwaves, thunderstorms, heavy downpours, or occasional strong winds. Check the Met Office weather-warning service during your trip. During significant heat, England may also have UKHSA Heat-Health Alerts.

How Does Humidity Affect Comfort Levels in London’s July Weather?

Humidity varies with the weather pattern. Warm, humid spells can feel muggy, especially when temperatures are high and winds are light, while drier days may feel comfortable at the same temperature. Rather than relying on one monthly humidity figure, check the forecast’s temperature, humidity, wind, and heat information for the day you are going out.

What Are the Typical Wind Patterns in London in July?

July is not usually London’s windiest period. Met Office 1991–2020 data for Kew Gardens gives a monthly mean wind speed at 10 meters of about 4.3 knots, although individual days can be much calmer or windier. Wind direction also changes with passing weather systems, so it is better to use the current forecast than assume one prevailing direction every day.

Are Weather Warnings Issued During London’s July Summer?

Yes. The Met Office can issue impact-based warnings for hazards such as thunderstorms, heavy rain, wind, lightning, and extreme heat. A warning is not automatically issued just because a day is hot or rainy, so check the current warning map when disruptive conditions are forecast. UKHSA also operates a separate Heat-Health Alerting system for England.

How Does London’s July Weather Impact Public Transportation?

Ordinary July weather usually causes no major problem, but extreme heat or severe storms can disrupt some services. Network Rail explains that hot rails can expand and overhead power lines can sag, sometimes requiring speed restrictions or other measures. On unusually hot or stormy days, check live transport updates and allow extra travel time.

Conclusion

July is one of the most comfortable times of year for many visitors to explore London. Expect average afternoon highs around 24°C (75°F), mild nights, long days, and a mixture of sunshine, clouds, and occasional rain. Pack light layers, a compact waterproof, comfortable shoes, sunscreen, and sunglasses. Most importantly, use the current forecast and official warnings to adjust your plans when a heatwave, thunderstorm, or unusually wet day develops.

Sources

1. Met Office — Kew Gardens Location-Specific Long-Term Averages — 1991–2020 temperature, rainfall, sunshine, wet-day, and wind averages.
2. Met Office — Weather Warnings Guide — official UK severe-weather warning system and covered hazards.
3. NHS — Sunscreen and Sun Safety — UV, shade, sunscreen, and summer sun-safety guidance.
4. UK Health Security Agency — Heat-Health Alerting System — England’s summer heat-health alert levels and alerting season.
5. Network Rail — Hot Weather and the Railway — effects of extreme heat on rails, overhead lines, and train operations.