What to wear to Beyond Wonderland: San Bernardino sits at 22°C (72°F) by day and 9°C (48°F) at night in March, on arena grounds, with a low chance of rain. That means a light base with one warm layer you can carry, cushioned trainers or a low boot, and a bag small enough for the gate rules. The crowd leans rave, fantasy and costume, so a full costume is the norm rather than the exception.
| Typical daytime high | 22°C (72°F) |
|---|---|
| Typical night low | 9°C (48°F) |
| Day–night swing | 13°C (23°F) |
| Rain risk | Low |
| Ground | Concrete and gravel |
| Sun exposure | High, little natural shade |
Everything below follows from those numbers.