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Although nearly surrounded by ocean, Los Cabos is in the "dry" tropics, where the sun is hot and rain is scarce. Los Cabos' weather is influenced primarily by its tropical latitude and the effects of the surrounding ocean on local weather patterns. Weather is mild, sunny and dry most of the year, hot and sometimes stormy in late summer.
Winters are sunny and mild. The summer moisture is dried, and skies are mostly clear. Daytime high temperatures are usually in the 70's (F). Nights range in the 50's and 60's. Mid-winter nights can sometimes drop into the 40's, and rarely does it rain.
Spring is the driest season. Most years, there is no rain at all from March through June. Winter blends almost imperceptibly into spring, and temperatures rise gradually with the approach of summer.
Los Cabos is hot in the Summer. From July through September, most days are in the 90's, sometimes topping 110 degrees inland, but seldom over 100 degrees near the ocean. Ocean water temperatures can rise above 80 degrees. Nights are increasingly warm and humid as August approaches. Late summer is the "rainy" season. August and September (hurricane season) are the rainiest months, although they combine for less than three inches on average.
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. 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. However, "average" precipitation figures can be misleading. 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. Water is always precious in this tropical desert.
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