Other facts from our historical weather data: Which is the warmest month in Nizwa? June has an average maximum temperature of 41°C (106°F) and is the warmest month of the year. Which is the coldest month in Nizwa? The coldest month is January with an average maximum temperature of 25°C (77°F). Which is the wettest month in Nizwa? March tops the wettest month list with 20mm (0.8 in) of rainfall. Which is the driest month in Nizwa? September is the driest month with 2mm (0.1 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.