The climate in Itajaí is humid in winter and dry in summer. In summer temperatures can reach 104 °F and during the winter they can get as low as 41 °F.
The average temperature is 60.3°F. The warmest month is August with an average temperature of 75.2°F. The coolest month is January with an average temperature of 46.5°F.
The average temperature 58.0°F. The warmest month is January with an average temperature of 68.7°F. The coolest month is July with an average temperature of 47.3°F.