What to expect next: cooler week, but a warm September is possible
The UK will see a changeable spell this week, with temperatures dropping from recent highs and showery conditions spreading in for many. Forecasters say these nearer-term conditions do not rule out the prospect of another warm spell in September, though confidence is limited as the country moves from summer into autumn.
Models and seasonal outlooks consulted by national weather agencies indicate an increased chance of dry and sunny periods next month. Experts point to a combination of factors that can favour later-season warmth in the UK: notably residual heat stored in the atmosphere and seas following an exceptionally warm summer, and drier soils in places that reduce evaporative cooling.
"likely to be the hottest on record"
The Met Office has said this summer is very likely to be unusually warm, a background that raises the odds of heat spikes continuing into early autumn. That does not translate into a deterministic forecast for a nationwide heatwave in September, but the statistical balance of risk shifts slightly towards further warm spells compared with a typical year.
Short-term outlook and what it means for September
In the immediate term many areas will feel a drop in temperature: mean values this week are expected to be about 2 to 4C below what is normal for mid-August. That cooler air is associated with a pattern change that brings more cloud and showers for some regions.
- Short-term: cooler than recent weeks, with showers for many and lower daytime maxima.
- Medium-term: uncertainty rises as meteorological autumn approaches on 31 August.
- Long-range: model guidance shows a heightened chance of dry, sunny spells in September, but not a certainty of a heatwave.
Seasonal forecasts produced in June by national centres — which took into account human-caused warming — anticipated a greater-than-usual likelihood of hotter-than-average conditions this summer. That background drove the exceptional temperatures seen over recent months and now factors into assessments for September.
Why September is harder to predict
Autumn is a transitional season meteorologically. The jet stream, sea surface temperatures and soil moisture can all change the balance of likely outcomes within a few weeks. In practice this means:
- Forecast confidence falls the further out you look — what looks likely in one model run can change as new observations come in.
- Local differences grow: parts of the UK could see prolonged dry, sunny conditions while others return to unsettled weather.
- Short-lived heat spikes are easier to produce than a sustained nationwide heatwave; timing and persistence matter for impacts.
| Metric | Current expectation |
|---|---|
| Temperature this week | About 2–4C below typical mid-August values |
| Transition to meteorological autumn | 31 August |
What this means for the public: short-term plans should allow for cooler, wetter weather this week, but it remains sensible to be prepared for a possible return of warmer conditions later in September. Those with responsibilities for vulnerable people, outdoor events or water resources should keep an eye on updates from the Met Office and other official providers as seasonal outlooks are revised.
Forecasters will update probabilities as new observational data and model runs become available. At present the assessment is that another spell of warm, dry weather in September is plausible — it is not guaranteed. Readers should treat longer-range guidance as indicative rather than definitive and follow routine preparedness: check forecasts in the days before travel or outdoor plans, and heed local weather warnings if issued.
In short: expect a cooler interlude now, but keep an eye on the maps — the odds of further warmth in September are above average, even though there is substantial uncertainty over timing and extent.
