What to wear to Rio Carnival: Rio de Janeiro sits at 33°C (91°F) by day and 24°C (75°F) at night in February, on city streets, with a high chance of rain. That means loose natural fabrics and real sun protection, cushioned trainers or a low boot, and a bag small enough for the gate rules. The crowd leans carnival, costume and samba, so a full costume is the norm rather than the exception.
| Typical daytime high | 33°C (91°F) |
|---|---|
| Typical night low | 24°C (75°F) |
| Day–night swing | 9°C (16°F) |
| Rain risk | High |
| Ground | Tarmac and pavement |
| Sun exposure | High, little natural shade |
At 33°C (91°F), synthetic fabrics stop breathing and anything tight becomes uncomfortable within an hour. Cotton, linen and loose cuts outperform whatever looks best in a photo, and SPF is part of the outfit, not an extra.
Assume rain. A packable shell in your bag costs nothing to carry and saves the weekend; a "cute" jacket that soaks through ruins two days.
Everything below follows from those numbers.