London set for a warm September as Met Office flags possible spells of 25C weather
Ers may not be done with summer just yet. The Met Office is forecasting warm spells in the south through the second half of September,. London — full details…
Londoners may not be done with summer just yet. The Met Office is forecasting warm spells in the south through the second half of September, with “very warm” conditions possible in the coming couple of weeks and temperatures in the capital expected to reach 25C in the middle of this week.
The outlook matters for anyone planning an outdoor weekend, a late-summer commute or a festival crowd. After a run of wet weather across parts of Britain, London looks set to stay largely dry through to the start of next week, even as showers hit other regions.
Dry in London, wetter elsewhere
For now, the capital appears to be catching the better side of the forecast. The Met Office says a warm and mostly dry spell should hold through to early next week, with only a chance of showers on Monday afternoon as Notting Hill Carnival reaches its peak.
That timing matters. Thousands of people are expected around the carnival route, and even a brief shower can change how a packed street event feels. But the broader picture for London is still upbeat. Warm air. Less rain. A bit of breathing room.
Elsewhere in the UK, conditions have been far less forgiving. Festival-goers at Reading spent the weekend in plastic ponchos, mud and puddles after rain turned the site messy. Cricket at Lord’s was also interrupted by rain on Saturday. In Devon, Bradworthy Common recorded 34.2mm of rain over 12 hours on Sunday.
What the forecast says for September
The Met Office’s long-range view is not promising a repeat of the summer’s extreme heat, but it does point to warm spells in southern areas later in the month. Forecast confidence drops further into September, yet the agency says settled or dry periods remain likely between weather systems.
Temperatures overall are expected to sit around average, though the south could still catch some warmer bursts. That leaves room for brief late-summer surges rather than a sustained heatwave. Short, sharp. Then gone.
For London, the near-term forecast is the part that will draw the most attention. The city is expected to hit 25C in midweek, enough to make streets, parks and transport feel distinctly summery again. After a summer of extraordinary heatwaves, that may be welcome news for some and a nuisance for others trying to get through a sticky evening underground.
Why it matters now
September weather in Britain often turns quickly, and that makes the current forecast more useful as a planning signal than a fixed promise. Warm spells can support outdoor events and late-season tourism, but they can also put pressure on travel, crowd management and public health messaging if temperatures rise again.
The Met Office has already warned this summer of how heat can strain health and infrastructure when humidity climbs. London’s September outlook is less severe than those record-breaking June conditions, but the city is still facing another warm run at a time when many parts of the UK are dealing with rain and disruption.
For now, the capital gets the better forecast. And the Met Office’s wording leaves the door open for more: “warm spells” in the south, with “very warm” weather possible in the next couple of weeks.
