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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the DailyCity weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
For London, the 21-day weather forecast shows a mixed period typical of early spring, with the live forecast above indicating current conditions. Expect temperatures ranging from 6°C to 14°C, with rain spreading from the west mid-month, followed by drier, brighter spells towards the third week.
What does the 21-day outlook for London look like?
Looking at the 21-day forecast for London, the capital sits in a zone influenced by Atlantic weather systems moving inland from the coast. The first week brings a risk of showers, especially across west London and the Thames corridor, while the second week may see a settled spell with lighter winds. By the third week, high pressure could build, bringing weather london 14 days of cooler but more stable conditions. This pattern aligns with what you might see on bbc weather london 15 day forecast updates, though the 21-day range carries lower confidence for precise timings.
How reliable is a three-week forecast for London?
A 21 day weather forecast london met office provides a general trend rather than day-by-day accuracy. The Met Office notes that beyond 10 days, forecast confidence drops significantly. For London, the outlook is useful for planning—like anticipating a wetter mid-month before a drier finish—but always check the live forecast above for the most current details. For hourly breakdowns, a 21 day weather forecast london hourly chart can help, but treat specific rain timings as indicative.
Is a 28-day forecast for London reliable?
A 28 day weather forecast london shows only broad seasonal trends, not specific daily weather. Confidence is very low beyond 21 days, so use it for a general idea of temperature shifts rather than rain timings.
How does the BBC 21-day forecast for London compare?
The 21 day weather forecast london bbc uses Met Office data, so it aligns closely with official models. It’s a reliable source for trend-based planning, though the live forecast above gives the most immediate reading.
What about AccuWeather’s 21-day forecast for London?
An 21 day weather forecast london accuweather often provides hourly breakdowns and precipitation probabilities. It can be useful for detailed planning, but cross-reference with the live forecast above for the most current conditions.
Sources
For more regional outlooks, see our UK weather hub, check conditions in Birmingham, or explore the 10 Day Weather Forecast UK for shorter-range planning.