London sees ten days of 22°C+ heat in September 2026
BBC Weather links the spell to a high‑pressure ridge over the South, while the Met Office expects dry, sunny conditions throughout the period.
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London will experience daily highs of 22°C or above from Sunday 20 September through Tuesday 29 September 2026, according to BBC Weather. The Met Office adds that the same ten‑day stretch will be sunny and dry. The forecast covers the whole capital and will affect everyday activities.
Forecast background
Barnet residents told no September heatwave as hosepipe ban stays in force
BBC forecasters rule out heatwave conditions, Met Office forecasts cooler highs and the drought is expected to continue until sustained rain arrives
The warm spell follows a mixed pattern earlier in the week. Thursday 17 September is forecast with light rain and a gentle breeze, while Friday 18 September should see sunny intervals. Saturday 19 September is expected to be mostly cloudy with occasional breezy rain. BBC Weather explains that a high‑pressure ridge centred over the South will channel warm air into London, replacing the recent wet spell.
Daily temperature outlook
The forecast lists a minimum of 22°C on 20 September, rising to 23°C on 22 September and 24°C from 23 to 26 September. The final two days, 27 and 28 September, return to 22°C, with the last day, 29 September, also at 22°C. All days are described as sunny with light winds, and the Met Office notes the weather may feel rather humid as temperatures climb.
Barnet residents should expect thundery showers on Sunday 13 September
BBC forecasts a 47% chance of thunder around 10 am while the Met Office predicts wet conditions from early morning until late morning
What residents should expect
Temperatures in the low twenties combined with sunshine can increase humidity levels. Health guidance typically advises staying well hydrated, limiting strenuous outdoor activity during the warmest part of the day, and checking on elderly or vulnerable neighbours. Public parks are likely to attract more visitors, and the warm, dry conditions may raise demand for cooling in homes and public buildings.
Potential wider impacts
Prolonged warm periods often lead to higher electricity usage for air‑conditioning and fans. While the forecast does not predict any service interruptions, utilities and local authorities usually monitor demand closely during such spells to ensure supply remains stable.
Questions this report answers
+When will London see temperatures of 22°C or higher?
The forecast shows daily highs of at least 22°C from Sunday 20 September through Tuesday 29 September 2026. This covers ten consecutive days, meaning residents can expect warm weather throughout that period.
+What is causing the warm spell?
BBC Weather attributes the heat to a high‑pressure ridge centred over the South of England. The ridge is expected to bring stable, warm air to London, replacing the unsettled weather that preceded the spell.
+How many days of sunshine are expected?
The Met Office predicts ten straight days of sunshine for the same 20‑29 September window. The forecast describes the weather as dry and increasingly warm, indicating little chance of rain during those ten days.
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