To make your visit more enjoyable, above are topics (Your Safety, Lodging, Pets) that will help you prepare for your trip to Muir Woods National Monument. The park is open every day of the year at 8:00 AM (including all holidays). However, be prepared for our weather. The park is cool, shaded and moist year round. Daytime temperatures at Muir Woods average between 40 and 70 degrees Fahrenheit. Be prepared for rain if visiting the park between November and April.