Other facts from our historical weather data: Which is the warmest month in Palmyra? July has an average maximum temperature of 38°C (100°F) and is the warmest month of the year. Which is the coldest month in Palmyra? The coldest month is January with an average maximum temperature of 13°C (55°F). Which is the wettest month in Palmyra? January tops the wettest month list with 21mm (0.8 in) of rainfall. Which is the driest month in Palmyra? August is the driest month with 0mm (0 in) of precipitation. Which is the sunniest month in Palmyra? July is the sunniest month with an average of 381 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.