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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Reading Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
A long range weather forecast looks beyond the standard 5–7 day outlook, typically covering 2–4 weeks ahead, and is best used as a broad trend guide rather than a day-by-day prediction. The live forecast above shows the current outlook for London, but for planning further ahead, you need to understand the limitations and reliable sources.
How reliable is a long range weather forecast?
Long range forecasts from the Met Office and other agencies are based on ensemble models, which run multiple simulations to calculate the most probable outcome. They are useful for spotting general patterns—such as a drier or wetter than average month—but become increasingly uncertain beyond 10 days. For a more immediate view, check our 10 day weather forecast UK page.
What can I expect for the coming weeks?
While exact temperatures are impossible to pin down weeks ahead, forecasters look at pressure systems and ocean currents to give a seasonal trend. For example, a persistent high pressure often brings settled, drier conditions, while a low pressure track signals more wind and rain. For the very latest updates, the BBC Weather UK page provides a reliable daily overview.
Is a long range forecast accurate for planning a holiday?
It can help you decide whether to pack for rain or sun, but avoid booking outdoor activities based on a forecast more than 10 days ahead. Check the weather tomorrow UK page closer to your trip for a more reliable picture.
How do forecasters predict weather weeks in advance?
They use computer models that simulate the atmosphere, running dozens of scenarios to see the most likely outcome. Ocean temperatures, jet stream patterns and historical data all feed into these long range predictions.
Where can I find the official UK long range forecast?
The Met Office publishes a monthly outlook and a 30-day forecast on its website. For a quick overview, our UK weather hub links to the latest guidance and warnings.