Depending on when you visit, Tucson will be either warm or hot. You're in the wrong place if you're looking for chilly weather. Even during the middle of winter (December-March), daily highs average around 65 degrees Fahrenheit. By May, the temperature will top 90 degrees Fahrenheit most days and likely won't drop back below until October. Temperatures above 100 degrees Fahrenheit are commonplace during the summer months of June through August. For most travelers, the best time to go to Tucson for good weather is during the spring months of March and April or the autumn months of October and November. Average highs during these months range from 70 to 90 degrees Fahrenheit.