As anyone with access to a window will tell you right now, the capital's short summery spell came to an abrupt end this morning, with heavy rain across London and the South East.
In fact, the forecast suggested it was likely to be so soggy today; it issued a yellow warning for heavy rain and thunder, suggesting up to 60mm could fall in the next 12 hours.
"There is an increasing risk of heavy rain, with thunder possible, developing over southern England on Tuesday afternoon before spreading northwards during the evening and overnight," it said.
"However, heavy and thundery rain could produce 20 to 30 mm rain in an hour and very locally 40 to 60 mm in six to 12 hours.
"Should this occur then some flooding is possible, especially across urban areas. Overnight rain should gradually start to ease and by early Wednesday morning may be confined to parts of the East Midlands and East Anglia."
However, it added any serious effects are "unlikely".
"There is much uncertainty with the forecast for this period and some places could even stay dry."
The rain will provide a marked contrast to the past few weeks, when humid, muggy weather pushed temperatures as high as 35 degrees celsius.