Other facts from our historical weather data: Which months have the greatest rainfall in Otaki? Most rainfall (rainy season) is seen in June, September and October. Which is the warmest month in Otaki? February has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Otaki? The coldest month is July with an average maximum temperature of 12°C (54°F). Which is the wettest month in Otaki? October tops the wettest month list with 174mm (6.9 in) of rainfall. Which is the driest month in Otaki? March is the driest month with 102mm (4 in) of precipitation. Which is the sunniest month in Otaki? January is the sunniest month with an average of 210 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.