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UK Late Summer Warmth on the Horizon

Uk weather September 

Summer 2025 has already seen a trio of heatwaves and forecasts suggest that extra warmth is still possible as August shifts into September. The Met Office long term forecast highlights a 2.3 times greater than normal chance of above average warmth across June through August and similar elevated potential may carry into September as warm sea surface temperatures persist  

Even though precise day‑by‑day forecasts remain elusive beyond a week the season outlook suggests a higher likelihood of warm spells rather than constant heat This means as August ends and September begins occasional hot days may occur especially across southern and eastern England and parts of Wales while cooler air and showers linger in Scotland and Northern Ireland  

What to Expect in Late August

Between mid and late August high pressure is likely to build and bring more stable settled weather This pattern raises the risk of short warm spells with temperatures reaching the low to mid‑30s °C in the southeast and central‑southern regions of the UK Meanwhile western England Wales and parts of Scotland may see more variable conditions with some showers or cloud cover  

By late August heatwave criteria—three consecutive days over regional thresholds which vary from around 25 °C in northern UK to 28 °C in London area—could be met in some areas resulting in official alerts  

Looking into September

While sustained heatwaves in September remain uncommon the Met Office suggests there may still be brief spells of warm to very warm weather especially in the south east temperatures might climb into the upper 20s °C but reaching 30 °C or beyond is considered unlikely according to current data  

This reflects typical UK late summer weather where days of warmth are interspersed with more unsettled periods as autumn begins to edge in

Why This Pattern Is Not Surprising

Spring 2025 turned out to be the sunniest and driest on record for parts of the UK setting the stage for elevated land and sea surface temperatures The Met Office and climate projections show heatwaves are now more frequent intense and widespread with a 50 50 chance of the UK exceeding 40 °C in the next 12 years  

Warm anomalies in the North Atlantic and Mediterranean are helping feed higher summer temperatures over Britain and if high pressure dominates the pattern late August through September it may allow warm air to build across southern areas  

Staying Prepared

Listen for daily updates from the Met Office and UK Health Security Agency They issue heat‑health alerts when thresholds are likely to be met Hydrate early in the day avoid prolonged sun during peak hours and keep tabs on higher than normal UV and pollen levels

Northern and western parts of the UK are more likely to see cloud showers and cooler air while the south and east may still experience scattered hot days especially before cooler air moves in