The Fire Brigade Union are walking out for the second time in a week due to rows over pensions. The government wants firefighters to work until they are 60.
Fire departments across Wales have issued safety warnings in light of bonfire night and are asking people to be careful with fireworks.
Trained auxiliary firefighters will step in to cover duty during the industrial action. The FBU will picket from 06:00 and 08:00 this morning.
More top news
Money worries are set to hamper people's enjoyment of the festive period, a new poll has found.
The annual Christmas Tree Festival in Penarth is in it's sixteenth year.
The Archbishop of Canterbury has backed Swansea East MP Carolyn Harris in her campaign to scrap costs for child funerals.