What to wear to Summerjam: Cologne sits at 24°C (75°F) by day and 14°C (57°F) at night in July, on beach, with a moderate chance of rain. That means a light base with one warm layer you can carry, flat sandals you can rinse, with trainers for the night stages, and a bag small enough for the gate rules. The crowd leans reggae, dancehall and beach, so anything that survives the day reads as right.
| Typical daytime high | 24°C (75°F) |
|---|---|
| Typical night low | 14°C (57°F) |
| Day–night swing | 10°C (18°F) |
| Rain risk | Moderate |
| Ground | Sand or pebbles |
| Sun exposure | High during the day, no shade at the main stages |
Sand plus sun cream is the real enemy of a beach festival outfit. Anything with a rough weave will hold both, so smooth fabrics and rinseable shoes win.
Everything below follows from those numbers.