Other facts from our historical weather data: When is the rainy season in Panajachel? Rainy season in Panajachel occurs in the months of May, June, July, August, September and October. Which is the warmest month in Panajachel? April has an average maximum temperature of 24°C (75°F) and is the warmest month of the year. Which is the coldest month in Panajachel? The coldest month is January with an average maximum temperature of 22°C (72°F). Which is the wettest month in Panajachel? September tops the wettest month list with 378mm (14.9 in) of rainfall. Which is the driest month in Panajachel? January is the driest month with 16mm (0.6 in) of precipitation. Which is the sunniest month in Panajachel? March is the sunniest month with an average of 249 hours of sunshine. 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.