It's in force between 5pm and midnight on Monday.
Exeter's Met Office has just issued the warning.
After a foggy start to the morning, it cleared to leave blue skies and sunshine, but the fog will return later.
The warning comes into force at 5pm (Monday 30th December) and stays in place until midnight.
It says to expect:
Latest updates from the Met Office here.
Exeter's oldest building needs roof repairs
City council to foot most of the bill
Newton Abbot market hall close to opening
The Grade Two listed building has been transformed
Torbay care home put into special measures
Staff failed to keep residents safe
Paignton Zoo unveils roaring upgrade plans
It will be bigger, better and wilder
Devon student chosen for Common Wealth Games
Doaa Shayea lifts the bar!
South West Water told to fix flaws
Environment Agency identifies 250 required actions
