This year's Bonfire Night was the mildest ever recorded.
Temperatures for the annual 5 November fireworks only dropped to 14.4C (57.9F), which was recorded in Teddington, southwest London.
Statisticians have to go back to 5 November 1938 to see the next mildest, which was a slightly cooler 13.9C at Gordon Castle in Scotland.
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Sky News weather producer Jo Robinson said a "southerly flow" had allowed temperatures to climb well above average by day and by night recently.
"We've also mostly been within a warm sector," she said, "with rather cloudy skies, humid conditions, and some rain."
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She said daytime temperatures had widely reached the mid-teens this week with a high of 18.6C (65.5F) at Chivenor in Devon on Wednesday.
"Average daytime highs for this time of the year are more like 12C in the South and 10C in the North," Robinson added.
Traditionally, Autumn starts in September and finishes in November, during which time the temperatures get cooler, the days get shorter and quite often the weather gets stormier.
The Met Office has warned on Thursday that the warm weather looks unlikely to continue.
"Looking ahead, model ensembles suggest a gradual decline in temperatures, with the most noticeable cooling in eastern areas," it said.
(c) Sky News 2025: Mildest Bonfire Night on record as UK experiences 'humid' conditions
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