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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Story Native weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The 30-day outlook for London is a broad trend forecast, not a precise day-by-day prediction. The live forecast above shows current expectations, but longer-range models become less reliable after two weeks. Expect typical seasonal variability — alternating mild and cooler spells with occasional rain, rather than any extreme or prolonged pattern.
How reliable is a 30-day forecast for London?
Meteorologists use ensemble models to produce a 30-day outlook, which indicates the most likely weather pattern rather than exact timings. Beyond 10–14 days, confidence drops significantly. For practical planning, the 10-day forecast offers far greater accuracy; the 30-day view is best used as a general guide for seasonal trends, such as whether temperatures will be near average or slightly above.
What should you look for in a 30-day outlook?
Focus on the overall pressure patterns and temperature anomalies rather than specific rain dates. A 30-day chart showing high pressure near the UK suggests drier, settled conditions; low pressure tracks bring wetter, windier spells. The live forecast above is updated daily, so check back regularly — especially if you are planning events or travel weeks ahead.
Why do 30-day forecasts keep changing?
Meteorological models are rerun several times a day as new observations come in. Small shifts in jet stream position or pressure centres can alter the predicted pattern, so the outlook evolves. Refresh the live forecast above for the latest guidance.
Is a 30-day forecast useful for holiday planning?
Yes, but as a trend indicator rather than a guarantee. If the 30-day outlook suggests a prolonged dry spell, your chances of fine weather are higher — but always check the 10-day forecast closer to departure for detailed planning.
How does the Met Office 30-day forecast differ from BBC Weather’s?
Both use similar global model data, but the Met Office provides its own ensemble (MOGREPS) while BBC Weather draws from the ECMWF model. You may see small differences in timing of weather systems; comparing both can give a more balanced view of the possible outcomes.
Sources
For other UK cities, compare the London weather hub or check Birmingham Weather and Glasgow Weather. Searches for weather london 14 days, london weather 15 days, or 21 day weather forecast london are often better served by the shorter-range forecasts above.