1976 United Kingdom heat wave

The 1976 United Kingdom heat wave led to the hottest summer average temperature in the UK since records began. At the same time, the country suffered a severe drought. It was one of the driest, sunniest and warmest summers (June/July/August) in the 20th century, although 1995 is now regarded as the driest. Only a few places registered more than half their average summer rainfall. In the CET record, it was the warmest summer in that series. It was the warmest summer in the Aberdeen area since at least 1864. It was the driest summer since 1868 in Glasgow.

Heathrow had 16 consecutive days over 30 °C (86 °F) from 23 June to 8 July and for 15 consecutive days from 23 June to 7 July temperatures reached 32.2 °C (90 °F) somewhere in England. Furthermore, five days saw temperatures exceed 35 °C (95 °F). On 28 June, temperatures reached 35.6 °C (96.1 °F) in Southampton, the highest June temperature recorded in the UK. The hottest day of all was 3 July, with temperatures reaching 35.9 °C (96.6 °F) in Cheltenham.

The great drought was due to a very long dry period. The summer and autumn of 1975 were very dry, and the winter of 1975–76 was exceptionally dry, as was the spring of 1976; indeed, some months during this period had no rain at all in some areas.

The drought was at its most severe in August 1976. Parts of the south west went 45 days without any rain in July and August. As the hot and dry weather continued, devastating heath and forest fires broke out in parts of Southern England. 50,000 trees were destroyed at Hurn Forest in Dorset. Crops were badly hit, with £500 million worth of crops failing. Food prices subsequently increased by 12%.

Massive swarms of seven-spotted ladybirds (Coccinella septempunctata) occurred across the country, with the British Entomological and Natural History Society estimating that by late July 23.65 billion of them were swarming across the southern and eastern coasts of England. The population explosion occurred because a warm spring had meant there were many aphids, the ladybirds' food prey; as the hot weather dried the plants on which the aphids fed, the aphid populations collapsed, causing the ladybirds to swarm to try to find food elsewhere.

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