Prevailing ocean breezes keep the temperature in Guanaja comfortable year around. This is especially true on the Cay, where the tropical tradewinds pass over the island unobstructed.

The temperature is generally in the low 80s, only occasionally getting in to the high 80s during August and September.

The graph below shows the average monthly range in land temperature.

The graph below shows the average monthly range in water temperature.

Rain falls throughout the year in Guanaja. The average rainfall is 100 inches a year which helps keep the island lush and green. Guanaja’s rainy season usually begins around October and lasts until December or January.

The graph below shows the average monthly chance of Precipitation.

The length of the day in Guanaja varies over the course of the year. In 2018, the shortest day is December 21, with 11 hours, 9 minutes of daylight; the longest day is June 21, with 13 hours, 6 minutes of daylight. The earliest sunrise is at 5:10 AM on June 4, and the latest sunrise is 1 hour, 5 minutes later at 6:15 AM on January 20. The earliest sunset is at 5:08 PM on November 23, and the latest sunset is 1 hour, 12 minutes later at 6:20 PM on July 6.

Daylight saving time (DST) is not observed in Guanaja.