Guyana is about 63% rainforest. There the air is moist and rain frequent, though it often does not penetrate the canopy. The rainiest season is summer, though some rain falls throughout the year. Showers or thunderstorms usually come in afternoon. Most days are said to have at least four hours of sunshine, and overcast is rare. Guyana is south of the hurricane belt.
The ocean moderates the coastal heat, often with a sea breeze. The tepuis, the soaring mesas of Guyana, are often much cooler than the rainforest immediately below.
In general, the average shade temperature is 27°C (81°F). Average maximum is 31°C (88°F) and the mean minimum is 24°C (75°F).
Particularly along the coast, the heat is greatly tempered by cooling breezes from the sea.
There are two wet seasons in the north of the country, from May to June, and from December to January. The south and the Rupununi savannah region receive one wet season from May to July. All wet seasons may extend into months either side. Rainfall averages 2,300 mm a year in Georgetown.