Yes, you should definitely have Euros when traveling to Portugal, as it is the official currency. While Portugal is highly modernized and credit/debit cards (specifically Visa and Mastercard) are accepted in most hotels, shops, and restaurants in major cities like Lisbon and Porto, cash is still essential for smaller purchases. You will likely need Euros for items like a coffee at a local "pastelaria," small souvenirs at street markets, or tips for tour guides and hotel staff. In 2026, it is a peer-to-peer best practice to carry about €50 to €100 in small denominations (€5, €10, and coins) for initial convenience. For the best exchange rates, it is generally recommended to withdraw Euros from a local bank ATM (Multibanco) using a debit card rather than using airport currency exchange desks. When using a card, always choose to pay in the local currency (Euros) rather than your home currency to avoid the poor exchange rates associated with "Dynamic Currency Conversion."