Conditions can vary widely, depending on location, time of day, and proximity to ocean and desert. The Pacific Ocean side of Cabo San Lucas, for example, is often ten degrees cooler than the downtown marina area, which Cabo's hills protect from chilly Pacific breezes. San Jose del Cabo, on the Sea of Cortez just 20 miles northeast of Cabo San Lucas, is often a few degrees warmer than San Lucas. Todos Santos, fifty miles north on the Pacific coast, is usually much cooler. Fog is rare in San Jose and San Lucas, but common a few miles north, along the Pacific.
Wind direction is a big factor in the weather.
Different levels of humidity and temperature occur when the wind blows from the desert and mountains, the Pacific Ocean or the Sea of Cortez. In the winter, the prevailing westerlies bring cool, dry Pacific air from the west and north. In the summer, the trade winds shift and carry storms and moisture from the south and east. The time of day also affects wind direction. Dry desert breezes are common at night, when warm air rising above the ocean draws cool air from the land.