St Swithin Stained Glass in Winchester Cathedral. Today 15th July is St Swithin's Day, he was a Saxon Bishop of Winchester, but is more famously known for a popular rhyme associated with him. St Swithin's day if thou dost rain, For forty days it will remain, St Swithin's Day if thou be fair, For forty days twill rain no more. B. Lowe
(Creatas via Getty Images) Weather Sayings: True or false?: “If it rains on St Swithin's Day then we're in for forty days of rain” False! Weather records began in 1861 and since then there has been no mention of 40 dry or 40 days of rain after St Swithin's day on 15 July, says The Weather Channel.