The Met Office has issued a yellow weather warning for a large portion of the UK with heavy rain set to hit on Tuesday morning.
The weather warning was issued at 4.39am with much of the south expected to endure a deluge of rain which could affect the morning commute.
It is in place until 10am with the area covering from the south coast to as north as Birmingham, with Cardiff, Taunton and Cambridge also set to be affected.
The national weather service has warned that bus and train services could take longer due to the inclement weather, with spray and potential flooding making it difficult for road commuters.
Britain has been sweltering in sunshine in recent weeks with just the odd shower and thunderstorm threat appearing intermittently over the last five weeks, including Manchester City's treble winning bus parade last Monday, but it did not spoil the celebrations.
However, much of the south of England is set to be hit by heavy rain this morning, with west London also included in the yellow weather warning area.
Despite the adverse weather, temperatures are expected to be above average for this time of year with most of the country experiencing low to mid 20s but could get as high as 27C in the south east of England.
Due to the wind direction, northern Scotland will be sweltering, if avoiding the rainfall, with the mercury climbing to 23C or 24C.
Met Office meteorologist Aidan McGivern said: "Clear spells for eastern Scotland, Northern Ireland and northern England. That's where the best of the sunshine will be first thing on Tuesday.
"It doesn't last that long because in the south is quite pushing north across the country. A wet spell for a few hours across the Midlands and Wales as it moves into northern England in the late morning and south east Scotland by the afternoon.
"In its wake, sunny spells, yes, but further showers developing across Wales and the south west [of England] as well as Northern Ireland and western Scotland.
"Again this will be hit and miss, not everyone will catch a shower, but where they do occur could be quite lively with some rumbles of thunder and some hail."
The east coast could be hit by torrential rain and with the rising temperatures as we head into the afternoon, thunderstorms are likely.
Heading into Tuesday night, the rain will clear as the UK enjoys a dry start to the early hours of Wednesday morning.
