Beautiful Britain shrouded in morning mist - but more sunshine ' s on the wayParts of the country could enjoy warmer weather than Portugal my the middle of the weekTemperatures set to remain above 20 C in most parts - much higher than the UK - wide average for September of 16 . 5 CBut weather forecasters warn heavy rain will hit Scotland tomorrow and reach the South by Saturday By Ellie BuchdahlPUBLISHED : 14 : 24 GMT , 23 September 2013 | UPDATED : 10 : 35 GMT , 24 September 2013 24 Viewcomments The season of mists was truly upon us this morning , as dense fog enveloped much of Britain in the early hours of the morning . The UK is basking in an extra week of summer sunshine as temperatures soar to a balmy 25 C , making parts of the country hotter than Portugal by tomorrow . But the low cloud and dew - soaked lawns this morning were a reminder that Sunday ' s equinox has ushered in the official start of autumn . Foggy ride : Mists made a stunning start to the day for this cyclist as they rode on Ditchling Beacon in the South Downs , East Sussex Cloud carpet : The early start was worth it for this couple , who were treated to an incredible panorama from Ditchling Beacon on a morning stroll Season of mists : The fog gradually recedes from Ditchling Beacon , opening up to a glorious late summer ' s day ahead Autumn air : Day and night were almost equal in length on Sunday ' s equinox , which marked the official end of summer Sea mist : Brighton Pier was shrouded in fog , which was expected to lift in time for Ed Miliband ' s keynote speech at the Labour Party Conference today Eerie : The burnt - out remains of old Brighton Pier were almost invisible from the shore in the early hours of the morning Sepia sunrise : Brighton seafront looked as if it had been photographed through a black - and - white lens this morning Pea souper : The Shard building and the Tate Modern rose out of the cloud as commuters in London made their way to work across the Millennium Bridge this morning Cloud city : The tops of the tallest buildings were all that was visible of the business and financial buildings at Canary Wharf for several hours this morning Rising up : St Paul ' s cathedral struggled to be seen in the thick fog that had begun to lift by around 8 am in the capital Closing in : Traffic crossing Tower Bridge could barely be seen during this morning ' s rush hour in London Lift up : The fog began to recede as the sun rose and London ' s landmarks began to be visible again to commuters along the river Invisible : The Shard is completely out of sight in the mist - but a bright red London bus stands out as it crosses a bridge over the ThamesBut Mr Wilson advised Britons to make the most of the warm weather as temperatures are due to drop from Saturday onwards . He said : ' From Thursday the temperatures will start to drop . There ' s a lot of uncertainty at the moment but it looks like it will begin to change on Saturday with rain moving in . ' It ' s likely to remain that way for most of next week so people should make the most of the extended summer sun this week . ' Sunday marked the autumnal equinox - the official start of autumn , when the sun passes directly above the equator and day and night become nearly equal in length . But while the changing season normally brings lower temperatures and blustery weather , autumn appears to be getting off to a slow start this year . School run : The gloomy weather might not have helped the Tuesday morning blues for those making an early start in Orpington , Kent Grey day : Motorists were warned to take care in the foggy weather that descended over the South East of England Drops of dew : Bright , sunny periods are expected later this afternoon , which was hard to believe in the morning Walk in the park : People enjoy the emerging Autumn colours at the Westonbirt National Arboretum near Tetbury , Gloucestershire , today Warm front : Temperatures across the country , including Westonbirt National Arboretum near Tetbury , Gloucestershire , have remained incredibly mild for this time of year One more week of summer : The majority of areas , including Westonbirt National Arboretum near Tetbury , Gloucestershire , enjoyed temperatures over 20 C Berry nice : A vole enjoys some seasonal berries it found outside its hole on the edge of a forest pond in Kent Breaking dawn : The sun rises at Milton Ferry Bridge on The River Nene near Peterborough , Cambridgeshire , today Peaceful : Birds fly over the Milton Ferry Bridge on The River Nene near Peterborough , Cambridgeshire , while cobwebs cover teasels near the water ' s edge Tranquil : A grebe and a heron enjoy the first rays of sunshine on the Gunwade Lake at Nene Park , Peterborough , Cambridgeshire , this morning Stunning view : Photographer Mark Upfield , 25 , captured these atmospheric pictures of heather at Bratley View , a favourite spot with walkers and photographers alike , in the New Forest Seasonal shrubbery : Beautiful heather plants cover fields in the New Forest Final flush : Yesterday Brighton beach was packed as people lapped up what could be the last week of summery sunshine http : / / www . dailymail . co . uk / news / article - 2429959 / UK - weather - Misty - morning - temperatures - hit - 25 C - autumn - heats - up . html # ixzz 2 foAqNDgO