Saint Swithin's Day

Today is Saint Swithin's Day - whatever the weather is like today would be the weather for the next forty days.

There's a weather rhyme which goes

'Saint Swithin's Day, if it does rain
Full forty days, it will remain
Saint Swithin's Day if it be fair
For Forty Days, t'will rain no more"

Fortunately it's a myth - the Met Office tested the weather on 55 occasions and 40 days of rain did not always follow.

Or is it? As the weather forecast is rubbash for the next 16 days.

Thank you very much Saint Swithin - I'm going back to the gym tqvm