Other facts from our historical weather data: Which months have the greatest rainfall in Neiva? Most rainfall (rainy season) is seen in March, April, May, October and November. Which is the hottest month in Neiva? September has an average maximum temperature of 33°C (91°F) and is the hottest month of the year. Which is the coolest month in Neiva? The coolest month is December with an average maximum temperature of 29°C (84°F). Which is the wettest month in Neiva? April tops the wettest month list with 217mm (8.5 in) of rainfall. Which is the driest month in Neiva? August is the driest month with 32mm (1.3 in) of precipitation. Which is the sunniest month in Neiva? January is the sunniest month with an average of 201 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.