Rosarito hosts 1 festival in this guide, in Baja California: Baja Beach Fest.
Rosarito has 1 festival in this guide. They run in August, and festival-day temperatures range from 27°C (81°F) to 27°C (81°F), with nights down to 19°C (66°F). That range is the reason there is no single "Rosarito festival outfit". The answer changes by month and by site.
Conditions are moderate across the board, so the day-to-night temperature drop is the thing to plan for rather than the weather itself.
The ground matters as much as the sky. Every festival here is on beach, which puts flat sandals you can rinse, plus trainers for the night stages at the top of the list for most of these events. None of them have camping on site, so you are travelling in and out each day and the outfit has to survive the journey at both ends.
Stylistically the crowd here leans beach, tropical, y2k and glam. Baja Beach Fest is the largest of them at around 25,000 people, and it sets the tone the smaller ones react to. None of that is a dress code. It is what you will see, which is worth knowing if you would rather blend in or deliberately not.
