https://travel-to--mexico.blogspot.com/2011/11/mexico-passport-and-visa-entry.html
Mexico Passport and Visa entry requirements
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Passports:
A passport valid for at least six months after the date of entry to Mexico is required by nationals referred to in the chart above.
Passport note:
(a) Applicants for Blue Tourist Cards should have a valid passport, return/onward ticket and proof of financial means.
(b) Tourist Cards must be kept by the visitor during the entire length of stay as they will have to be presented and stamped on leaving.
(c) Immigration authorities may require your return airline ticket or onward ticket and proof of financial means (international credit cards, debit cards or traveller's cheques).
Visas:
Visas are not required by nationals referred to in the chart above, who can obtain a Blue Tourist Card for touristic purposes from their airline on direct flights, at port of entry, or from the Mexican Consulate before travelling, for 180 days.
Passport and Visa entry requirements
Entry requirements for Americans: US citizens must have a passport that is valid upon their arrival in Mexico. A visa is not required, for stays of up to 180 days.
Entry requirements for UK nationals: British citizens must have a passport that is valid upon their arrival in Mexico. A visa is not required, for holders of British passports endorsed British Citizen, British National (Overseas) or British Subject, nor for for holders of a valid visa for the USA, for stays of up to 180 days.
Entry requirements for Canadians: Canadian citizens must have a passport that is valid upon their arrival in Mexico. A visa is not required, for stays of up to 180 days.
Entry requirements for Australians: Australian citizens must have a passport that is valid upon their arrival in Mexico. A visa is not required, for stays of up to 180 days. Note that visa exemptions apply to holders of an APEC Business Travel Card, provided that the card is valid for travel to Mexico (i.e. endorsed with "MEX" on its reverse side).
Entry requirements for South Africans: South African citizens must have a passport that is valid upon their arrival in Mexico. A visa is required. Note that visa exemptions, for stays of up to 180 days, apply to holders of a valid visa for the USA.
Entry requirements for New Zealanders: New Zealand citizens must have a passport that is valid upon their arrival in Mexico. A visa is not required, for stays of up to 180 days. Note that visa exemptions apply to holders of an APEC Business Travel Card, provided that the card is valid for travel to Mexico (i.e. endorsed with "MEX" on its reverse side).
Entry requirements for Irish nationals: Irish citizens must have a passport that is valid upon their arrival in Mexico. A visa is not required, for stays of up to 180 days.
Passport/Visa Note: All foreign passengers to Mexico must hold a tourist card (FMT form), which is issued free of charge, and obtainable from airlines, Mexican Consulates, Mexican international airports, and border crossing points. As part of the Western Hemisphere Travel Initiative (WHTI), all travellers transiting through the United States are required to present a passport, or other valid travel document, to enter or re-enter the United States. Foreign passengers to Mexico should ensure that their passports and other travel documents are in good condition - even slightly torn passports will not be accepted. NOTE: It is highly recommended that your passport has at least six months validity remaining after your intended date of departure from your travel destination. Immigration officials often apply different rules to those stated by travel agents and official sources.