The summer holidays are over, and the return to school and work begins on what could be the worst day of the year on the roads.
And, just as a wash-out August ends, the start of autumn will bring a change in the weather with September starting with a mini-heatwave.
Temperatures in the West could reach into the mid-70sF, with the mercury rising "day by day" from tomorrow onwards, and the sunny days being noticeably warmer than the wet, windy and chilly second half of August.
Krista Mitchell, meteorologist at the Met Office, said: "What we've got is high pressure building which is bringing more settled conditions, and also slightly warmer conditions as well. We had a pretty cool August, temperatures in places below average for the last couple of weeks, so it looks like it's warming up as we go into the middle of the week.
"It's not going to be wall-to-wall sunshine but where there are sunny spells it's going to feel pretty warm.
"Generally temperatures are rising day on day from Tuesday, basically. By Thursday or Friday, we could see 24C or 25C in the sunny spells in the south," she added.
The return to the school run will fill the roads for the morning commute again for the first time since late July, and with a new season of roadworks starting across the region, and the exodus from the Great Dorset Steam Fair filling the roads in north Dorset and south Wiltshire in particular, motoring organisations warned people to be patient.
The biggest headache for commuters in the Bristol area will be for those travelling in from North Somerset due to long-term work on the A370 Long Ashton bypass. They have already had to put up with delays on the main road between the dual carriageway and Backwell.
The multi-million pound repair work on the 45-year-old Yanley Viaduct means that two out of the three lanes on the road will be closed until mid-January.
Traffic runs one-way into Bristol in the mornings to ease the flow of commuters in the area.
The traffic flow changes at 11.30am, with the one lane re-opening for traffic travelling out of the city during the afternoon and evening.
Traffic diversions are expected to continue until mid-January, and council officials hope the work will be completed by mid-March.
An estimated 19,000 vehicles use the bypass each day.
Meanwhile, Bristol Water is reaching the last phases of its five-year programme to renovate more than 150 miles of Victorian water mains.
It is doing this by pushing or pulling large plastic tubes inside the ageing cast iron pipes which leak and cause poor water pressure.
Water mains works in Temple Gate near the entrance to Temple Meads railway station has closed a lane for outgoing traffic causing delays at peak times.
And road users will only be too well aware of holes in the ground all over the city as these blue pipes are inserted underground.
Bristol Water spokesman Paul Kelson said there was never a good time to undertake a major programme of work which meant disrupting traffic.
But he said the work was crucial to make sure that everyone continued to receive a high quality water supply.
There are also roadworks in Baldwin Street to create new cycle lanes and new crossings are being installed at St James Barton roundabout so people can cross at surface level instead of using the subways.
On the Avon Ring Road, there is a lane closure near the M32 roundabout while workmen create a cycle crossing on the busy dual-carriageway. This work will continue until the end of October.
Lane restrictions are in place on Old Market while essential upgrades are made to the road surface at the bus stops.