What to wear to Mysteryland: Haarlemmermeer sits at 22°C (72°F) by day and 13°C (55°F) at night in August, on open field, with a moderate chance of rain. That means a light base with one warm layer you can carry, broken-in boots or sturdy trainers, and a bag small enough for the gate rules. The crowd leans rave, edm and costume, so a full costume is the norm rather than the exception.
| Typical daytime high | 22°C (72°F) |
|---|---|
| Typical night low | 13°C (55°F) |
| Day–night swing | 9°C (16°F) |
| Rain risk | Moderate |
| Ground | Grass that turns to mud |
| Sun exposure | High during the day, no shade at the main stages |
Everything below follows from those numbers.