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UK Heatwave: Scorching 29C Heat Expected This Week!
15 Sep
Summary
- Temperatures are predicted to exceed 25C across southern England early this week.
- Highs are forecast to reach 29C by Friday, with much of the south reaching 27C-28C.
- A heatwave is defined as three consecutive days where temperatures meet a local threshold.
Following the UK's hottest summer on record, the nation is anticipating further hot spells this month. By Monday, September 19, 2026, much of southern England is forecast to see temperatures exceeding 25C. This warmth is set to intensify on Tuesday, with areas in Dorset, Berkshire, and Cambridgeshire reaching 26C, and other parts of the UK remaining in the mid-twenties.
Wednesday and Thursday are predicted to bring even hotter conditions, with highs of 27C expected in Somerset, Dorset, and Gloucestershire, while Cheshire reaches 25C. The heat is expected to peak on Friday, September 25, 2026, with a scorching 29C forecast for Dorset. Most of the south will experience at least 27C, with some areas climbing to 28C.
The weekend, starting Saturday, September 26, 2026, will remain warm, particularly in the South West. The entire week is predicted to maintain mid-twenties temperatures for many. A heatwave is officially defined as an extended period of hot weather where daily maximum temperatures meet or exceed a local threshold for at least three consecutive days, with benchmarks ranging from 26C to 28C in the south.
The forecast for September 19 to September 28, 2026, suggests a mix of weather patterns. While warm days are likely, there will also be settled periods, especially across southern England. There's a possibility for settled weather to extend further north towards the end of September. Overall temperatures for this period are expected to be close to average, though some warm days and cool nights, potentially bringing grass frost, are anticipated.
