What to know before you go
Take the altitude seriously your first days
CriticalCDMX sits at ~2,240m (7,350ft). Expect to get winded on stairs, dehydrated, and drunk faster than usual. Ease into exercise, drink water, and go easy on the mezcal at first.
Never drink the tap water
CriticalEven locals don't. Homes use garrafones (20L jugs) or filters; restaurants serve purified water. Brushing teeth with tap water is usually fine, but don't drink it.
Learn the earthquake drill
ImportantThe seismic alarm (alerta sísmica) gives seconds of warning. Know your building's safe spots and exits, and don't panic-run down stairs. The big citywide drill is each 19 September.
Use Uber or DiDi, especially at night
ImportantSkip hailing street taxis. App rides are cheap, tracked and far safer. Stay aware in crowds and on the Metro, and keep your phone out of sight on the street.
Tip 10-15% in restaurants
Good to knowPropina is expected and usually not included — leave 10-15%. Round up for taxis and tip baggers at the supermarket and parking valets (a few pesos).
Decode 'ahorita'
Good to knowWhen someone says ahorita ('right now'), it rarely means immediately. For plans, deliveries and tradespeople, pin down an actual time rather than trusting ahorita.