The days were partly cloudy, warm, and very humid. Manzanillo temperatures during the daytime hovered in upper 80’s Fahrenheit. One word of caution is that it is very easy to get sun burnt even if one is not exposed to the sun for very long. As a result, wear at least SPF 40+. It is especially easy for sun starved tourists who are vacationing from much colder climates to lay out in the sun for several hours.
June through September tends to be extremely humid and rainy, often with sun in the morning but by afternoon becoming cloudy and raining later in the day. Rain in Manzanillo rarely falls for an extended time.
Like in other hot and humid locations we have visited around the world, rain is not necessarily a bad thing – it will drop the heat to temperatures that are more bearable.