Police appealed to drivers to watch out for motorbikes after two riders were killed in the space of 11 hours on the West's roads.
The first incident happened near Somerton on Sunday evening when a 54-year-old motorcyclist was heading home to Yeovil on the B3151 at around 6.50pm.
The motorcyclist, who has not been named by police, was involved in a collision with a Ford Transit travelling in the opposite direction, and the man was rushed to Yeovil district hospital, but died later.
Then, 11 hours later at 5.50am yesterday, a 51-year-old man was involved in a fatal crash on the A371 at Locking, just outside Weston-super-Mare. The man was named as Ross Martyn Fryer, from Weston.
The main A371 road was closed for more than four hours and police appealed for any witnesses to come forward.
While investigations into both crashes continue and the cause of both deaths are yet to be formally established, police road safety teams had warned last week that the first appearance of dry, warmer weather over the weekend would mean motorbikes would reappear on the West's roads in far greater numbers.
They urged drivers to be aware of bikes as thousands took to the roads over the weekend to enjoy the more clement weather and road conditions. Temperatures will drop back to a more normal spring level this week, forecasters said yesterday.
The mercury reached 20C (68F) for the first time in nearly six months as most of the country basked in sunshine over the weekend, the Met Office said.
Most other parts of England have been experiencing warmth around 18C (64.4F) but although temperatures are set to fall by around 5 or 6C from the weekend high, the coming week will remain mainly dry, forecasters said.
In a separate crash over the weekend, a man from Wiltshire was airlifted to hospital at Frenchay in Bristol after a serious crash involving an entire family in Gloucestershire.
The 52-year-old, from Chippenham, suffered serious injuries when the Mercedes ML320 he was driving was involved in a crash with an Audi car at the entrance to the National Diving Centre on the A48 at Tidenham, near Gloucester.
A 48-year-old woman in the Mercedes passenger seat was also taken to Frenchay with a fractured arm and other minor injuries, while two children in the back suffered minor injuries. A couple from Lydney in the Audi were both taken to hospital in Gloucester with injuries that were not serious.
The crash happened at 2.10pm on Sunday, and police closed the road for a time.