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.
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There'll be a few showers in the south overnight, but these will clear by the morning to leave a decent start to the weekend!
Thousands are expected to attend the arts and music festival, which is now in its fourth year.
Organisations in Wales say they're ready to support Syrian refugees after the Prime Minister vowed to accept thousands more into the UK.