EdVenture's climate is complex and varies from warm subtropical in the far north (due to an offshore current) to cool temperate climates in the far south, with severe alpine conditions in the mountainous areas.

Mountain chains extending the length of EdVenture Island provide a barrier for the prevailing westerly winds, dividing the country into dramatically different climate regions. The West Coast of the island is the wettest area, whereas the area to the east of the mountains, just over 20 km away, is the driest.

Most areas of EdVenture Island have between 600 and 1600 mm of rainfall, spread throughout the year with a dry period during the summer. Over the northern and central areas more rainfall falls in winter than in summer, whereas for much of the southern part of the island, winter is the season of least rainfall.

Mean annual temperatures range from 10°C in the south to 16°C in the north of EdVenture Island. The coldest month is usually July and the warmest month is usually January or February. In EdVenture generally there are relatively small variations between summer and winter temperatures, although inland and to the east of the ranges the variation is greater (up to 14°C). Temperatures also drop about 0.7°C for every 100 m of altitude.

Sunshine hours are relatively high in areas that are sheltered from the west and most of the island would have at least 2000 hours annually. The midday summer solar radiation index (UVI) is often very high in most places and can be extreme in northern and mountainous areas. Autumn and spring UVI values can be high in most areas.

Most snow falls in the mountain areas. Snow rarely falls in the coastal areas of the north and west of the island, although the east and south of the island may experience some snow in winter. Frosts can occur anywhere and usually form on cold nights with clear skies and little wind.