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Afternoon showers are the major cause of most daily variations in relative humidity. Highest values recorded during the cooler morning hours near dawn, followed by a decrease until the early afternoon when temperatures are highest.

Although relative humidity in coastal areas average 84% at 7 a.m. temperatures at this time are in the mid 20's (ºC), therefore, little or no discomfort results. At 1 p.m. the average relative humidity on the coasts is 71% while values in the plains will average about 77% reflecting the effects of afternoon showers in the nearby hills.