While most Brits would understand the phrase as 'this weather is awful', those not familiar with local customs might be confused about why rain is considered pleasant or think that Brits actually like the rain.
Especially topical right now is Rio 2016.
According to an infographic created by London City Airport, if someone says that Team GB will do OK at the Rio Olympics, they actually mean that Team GB will triumph at the Games.
There are plenty of similar scenarios - some of which will be very familiar to visitors to the UK.
For example, a Brit might say "great to meet you, let's stay in touch", when really, they fully anticipate they will never see the person again.
When they say "when you get a minute", they really mean right now.
And when they say they're glad they missed something, they're actually wishing they were there.