Other facts from our historical weather data: Does Willows have a dry season? Yes, the months of May, June, July, August and September are very dry. Which is the warmest month in Willows? July has an average maximum temperature of 35°C (95°F) and is the warmest month of the year. Which is the coldest month in Willows? The coldest month is December with an average maximum temperature of 14°C (57°F). Which is the wettest month in Willows? December tops the wettest month list with 86mm (3.4 in) of rainfall. Which is the driest month in Willows? August is the driest month with 0mm (0 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.