London Solar Eclipse Weather Forecast: For a few minutes on Wednesday evening, the London sky could take on an unusual appearance as the Moon moves across the Sun and hides most of its bright disk. The August 12, 2026 solar eclipse will give the UK its deepest partial eclipse in decades, with around 90% of the Sun covered from London. But there is one factor that could make or break the spectacle: the weather.
The eclipse will begin in London at around 6.17 pm, reach its maximum at approximately 7.12 pm and finish at 8.06 pm. Because the Sun will sit low toward the western horizon during the event, clear skies alone will not be enough — viewers will also need an unobstructed view toward the west.
London Solar Eclipse Weather Forecast: Clear Skies Could Bring Good Views
Current forecasts point towards favourable conditions for London during the eclipse, with warm temperatures and a generally clear outlook.
The Standard reported that the forecast was pointing towards sunny conditions, light winds and temperatures around 29C at 6 pm on Wednesday, with temperatures expected to ease towards 27C by 8 pm.
That would provide a strong opportunity for Londoners to watch the eclipse, particularly if cloud remains limited around the western horizon.
However, weather forecasts can change in the days before an event. Localised cloud, showers or thunderstorms could still affect visibility.
Solar Eclipse 2026: What Time Will the Solar Eclipse Start in London?
The eclipse will unfold over almost two hours.
According to the Royal Observatory Greenwich, the Moon will first begin covering the Sun in London at 6.17 pm. The eclipse will reach its maximum at about 7.12 pm, when roughly 90% of the Sun will be obscured.
The eclipse will then gradually end at around 8.06 pm.
London Solar Eclipse Weather Forecast: London Solar Eclipse Timings
- Eclipse begins: 6.17 pm
- Maximum eclipse: 7.12 pm
- Eclipse ends: 8.06 pm
- Maximum coverage: Around 90%
The exact timings vary slightly across the UK.
London Solar Eclipse Weather Forecast: Why the August 12 Eclipse is So Special?
The UK will not experience a total solar eclipse on August 12. Instead, the country will see a deep partial eclipse.
Even so, the event will be unusually dramatic because the Moon will block around 90% to 96% of the Sun in different parts of the UK and Ireland. Cornwall could see roughly 95% coverage, while Pembrokeshire could reach about 94%.
London will see about 90% coverage.
The last time Britain experienced an eclipse with comparable coverage was in 1999, making this one of the most significant solar eclipse events visible from the UK in a generation.
The next total solar eclipse visible from the UK will not occur until 2090.
London Solar Eclipse Weather Forecast: Londoners Should Look Towards the Western Horizon
The timing of the eclipse creates both an opportunity and a challenge.
The event will take place as the Sun approaches sunset. As the eclipse progresses, both the Sun and Moon will move increasingly close to the western horizon.
The Royal Observatory Greenwich therefore recommends finding a location with a clear view towards the west. A high vantage point can also help viewers avoid buildings, trees and other obstructions.
This means Londoners should consider their surroundings before the eclipse begins. A location with an open western skyline will offer a much better chance of seeing the entire event.
London Solar Eclipse Weather Forecast: Will Clouds Spoil the August 12 Solar Eclipse?
Weather remains the biggest uncertainty for eclipse watchers.
Even during generally settled summer weather, isolated clouds, showers or thunderstorms can develop. A small area of cloud positioned over the Sun at the wrong moment could block the view.
Recent wider forecasts suggest much of western Europe could have favourable viewing conditions, although some areas — including parts of Scotland and Ireland — face a greater risk of cloud.
For London, the current outlook is encouraging, but viewers should check the latest local forecast on Wednesday before heading out.
London Solar Eclipse: Where Will the Best Eclipse Be Seen in the UK?
The farther southwest people travel, the greater the percentage of the Sun they will see covered.
Cornwall will be among the best locations, with approximately 95% of the Sun obscured. Pembrokeshire could see around 94%, while London, Bristol and Cardiff will experience about 90% coverage.
Other parts of Britain will also see a major partial eclipse, although coverage will gradually fall towards the north and east.
This makes southwestern England and western Wales particularly attractive for people who want the deepest possible partial eclipse without leaving the UK.
London Solar Eclipse: August 12 Eclipse Will Be Total in Parts of Europe
While Britain will see only a partial eclipse, some locations along the eclipse’s narrow path will experience totality.
NASA says the total eclipse path will cross Greenland, Iceland, northern Russia and Spain, while a partial eclipse will be visible across much of Europe, parts of North America and northwestern Africa.
In the total-eclipse zone, the Moon will completely cover the Sun for a short period, allowing observers to see the solar corona.
The UK sits outside this path, so viewers there will always see part of the Sun remaining uncovered.
Solar Eclipse 2026: How to Watch the Solar Eclipse Safely?
People should never look directly at the Sun without proper solar protection, even when most of the Sun is hidden.
The Royal Observatory Greenwich recommends using suitable solar viewing equipment. Ordinary sunglasses do not provide sufficient protection for looking at the Sun.
Anyone planning to photograph the eclipse should also use an appropriate solar filter designed for the equipment being used.
Because the London eclipse will remain partial throughout, viewers must continue using eye protection during the entire event.
Solar Eclipse 2026: Weather Could Decide the View
The astronomical conditions are already set: the Moon will cross the Sun on August 12 and hide around 90% of it from London.
The remaining question is whether London’s skies will cooperate.
If the current forecast holds, warm temperatures, light winds and largely clear conditions could give millions of people a strong chance of seeing the event. But the eclipse’s low position in the western sky means even a narrow band of cloud or an obstructed horizon could spoil the view.
For Londoners hoping to witness one of the UK’s most impressive partial solar eclipses in decades, the safest plan is simple: check the latest forecast, find a clear western viewpoint and prepare proper solar eye protection before the Moon begins its journey across the Sun.
