CLIMATE. G enerally speaking, the climate varies from region to region in Peru. In the Coast, the weather varies, with a damp and cloudy winter that runs from June to September. Average temperatures come in at 14 C. During the summer, temperatures can peak at 28 C or over.In the Highlands, the sun shines all year round during the morning, but temperatures descend at night, averaging 5 C.n the Coast, the weather varies, with a damp and cloudy winter that runs from June to September. Average temperatures come in at 14 C. During the summer, temperatures can peak at 28 C or over. In the Highlands, the sun shines all year round during the morning, but temperatures descend at night, averaging 5 C.