What To Expect Finding out about weather conditions can help you prepare for your visit to the John Muir National Historic Site. Please see the information below for general weather. We suggested that you do an internet search if you'd like to find out specifics for the day or week of your visit.
Martinez California Weather
May to September: very dry, 60-100º+ F
October to November: dry/wet, 55-80º F
December to February: wet, 45-75º F