Indian Summer Uk Weather

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By Thomas Grant, Politics & Public Affairs EditorReviewed by Oliver ReevesForecast data: Open-Meteo & national met services

Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Media Grid UK weather desk. Data from national met services via Open-Meteo.

The live forecast above shows daytime highs of 22–25°C across southern Britain this week, with light winds and clear skies – a classic indian summer pattern, defined as unseasonably warm, settled weather after the autumn equinox.

What is behind this Indian Summer?

A persistent area of high pressure anchored over Scandinavia is drawing warm continental air northwards, keeping Atlantic weather systems at bay. This setup typically delivers the mildest conditions to eastern and southern England, while western Scotland and Northern Ireland see more cloud. The Met Office notes that such blocking patterns become more common in September and October, often producing what many call an indian summer 2025.

How long will the warm spell last?

Current model runs indicate the high pressure will hold through the weekend, with a gradual breakdown early next week as a front approaches from the Atlantic. The highest temperatures are expected Thursday to Saturday, with a risk of morning fog in rural areas. For a detailed outlook, see our 10 Day Weather Forecast UK.

DefinitionUnseasonably warm, dry weather after the autumn equinox (23 September) in the UK.

Typical timingMost common in late September through October; occasionally extends into early November.

DurationUsually 3–7 days, but can last up to two weeks if the high pressure remains stationary.

Record temperature29.9°C in Gravesend, Kent, on 1 October 2011 – the hottest October day on record for the UK.

Why is it called Indian Summer?

The term dates from the late 18th century in North America, referring to a period of mild, hazy weather in autumn. It may have originated from Native American harvest periods or from the warm conditions that allowed Indigenous peoples to continue hunting. The phrase has been used in the UK since the 19th century.

What is an Indian Summer in the UK?

In the UK, an Indian summer is a spell of unseasonably warm, calm weather that occurs after the autumn equinox (usually in September or October). It requires clear skies, light winds, and temperatures notably above the seasonal average – often reaching 20–25°C in southern England.

Is the term Indian Summer offensive?

Some people consider the term outdated or culturally insensitive because it uses ‘Indian’ as a misnomer for Native Americans. Alternative phrases include ‘second summer’, ‘St. Martin’s Summer’, or simply ‘warm autumn spell’. The Met Office still uses ‘Indian summer’ in its official glossary but notes the sensitivity.