Weather is probably a major factor when you plan your trip to Willow Creek, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 60°F, while the coldest months are February and March with an average of 48°F. The rainiest months in Willow Creek are December, March, January, and February, with each month seeing an average of 9 inches of rainfall.