Mexico in May

By April the peninsula is noticeably warming, especially in inland towns like Mexicali which can reach hot daytime temperatures; coastal breezes keep resorts around Cabo and Loreto comfortable. The Sea of Cortez is calm and starting to warm, making snorkeling and diving increasingly pleasant though afternoon heat builds. Tourist crowds are modest after Easter; pack sun protection and a hat for the increasingly intense UV.

May marks the approach of the rainy season: late afternoon thunderstorms begin to develop in the coastal mountains and the Sierra Madre, bringing sudden heavy downpours and relief from daytime heat. Surf spots like Playa Zicatela can start to see more consistent swells, but river-fed canyons and mountain roads may become slick; check local conditions before hiking. Expect humidity to rise in coastal towns and pack a light rain jacket for sudden showers.

April brings warmer days and the highland plains begin to dry out before the rainy season; the temperature swing between warm afternoons and cool nights becomes more pronounced. Precipitation is still low, but wind and dust in some valleys can make midday outdoor plans less comfortable; sun protection and layered clothing are advisable. This is a popular month for visitors to Guanajuato and San Miguel de Allende due to pleasant conditions and festival timing.

May is the ramp-up to the wet season: humidity climbs and afternoon thunderstorms begin to form inland, especially in the mountain slopes feeding the Gulf. The increased moisture makes waterfalls and river excursions fuller and more dramatic, but also raises the risk that coastal roads will flood during heavy downpours. Travelers should expect hot, muggy days and sudden rain; bring quick-drying clothing and expect sticky conditions in lowland towns.

May marks the beginning of the summer build-up - humidity increases and isolated thunderstorms start to appear, though widespread rains are still limited. Isla Holbox begins preparing for its whale-shark season in early summer; if you plan to swim with whale sharks expect crowded boat days once the season opens. Packing light, breathable clothing and sun protection is critical, and consider scheduling early-morning tours to avoid heat and mid-afternoon storms.

May marks the beginning of frequent afternoon showers in the southern highlands: waterfalls like Hierve el Agua and the cascades around San José del Pacífico pick up flow and look dramatic. Trails become muddier and some rural roads may be more difficult, so guided trips are often the safer choice. Cooler cloud-forest areas around El Triunfo can be misty and atmospheric; bring waterproof layers and good boots.