Local bars are all getting involved with the Irish festivities, hosting music and providing plenty of Guinness.
The 27 degree predicted temperature means precautions are being taken to make sure people don't get too intoxicated.
The Craic Irish Bar are predicting a big turn-out tonight and have ordered more kegs of beer to deal with the demand.
They have opened their windows and put the air conditioner on to help with the heat.
Rose and Thistle bar worker Delphine Herbert said when the weather is hot people tend to drink more and get intoxicated faster.
She said they will be making sure people have access to water and will serve juice and fizzy drinks.
Police said in a statement to drink in moderation and to look after friends to make sure everyone gets home safe.
There are many different events happening around the city including the New Brighton Pier joining landmarks around the world and lighting up green.