The lowlands enjoy fine, sunny weather by day and moderate humidity. In the mountains early mornings and evenings are usually clear, but clouds build up by midday with some heavy afternoon showers. The clear starlit (often windy) nights are quite cold, necessitating the use of sleeping bags

Rain falls throught the year with an annual total of more than 2,000 mm, but the pattern shows remarkable differences within the Park, due to influence of the mountains.

The northen plains are wettest from November to April, but the south coast from May to October.