Nights are increasingly warm and humid as August approaches. Humidity hangs in the 70's. Autumn brings abrupt change. Weather remains warm and muggy until the ocean currents begin to cool in mid-October. October is the major transition month, as the trade winds reverse direction and weather patterns shift.
Nights are cool again, and people stop sweating.
The change can be remarkably sudden, but is always welcome. Although infrequent, rain is more likely in the autumn than in the spring. Annual rainfall averages less than seven inches, and most of that can fall during one or two storms. A single year with a major rainstorm can disguise a lot of very dry years. The annual average rainfall of more than 30 inches in the Laguna Mountains provides Los Cabos with fresh water, but the supply is limited.