Information About Rio de Janeiro - Weather
Being in a tropical zone, temperatures in Rio de Janeiro should be high, but the influence of the Serra do Mar affects all aspects of climate, giving the state a wider variation in temperature and rainfall than would otherwise be expected. The coastal temperatures can be up to 40°C (104°F) with high rains and humidity, and as low as 18°C (64°F) in a cold spell. Whereas in areas close to the mountains, such as Paraty and Itaipava the temperatures are much cooler and there is less of a dry season. As in Bahia, cold fronts sometimes occur.
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