Other facts from our historical weather data: Which months have the greatest rainfall in Palmetto Bay? Most rainfall (rainy season) is seen in January, October, November and December. Which is the hottest month in Palmetto Bay? September has an average maximum temperature of 30°C (86°F) and is the hottest month of the year. Which is the coolest month in Palmetto Bay? The coolest month is January with an average maximum temperature of 27°C (81°F). Which is the wettest month in Palmetto Bay? October tops the wettest month list with 295mm (11.6 in) of rainfall. Which is the driest month in Palmetto Bay? April is the driest month with 30mm (1.2 in) of precipitation. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.