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When is the best time to travel to Santiago? Well, it depends on your reason for traveling. The city enjoys a Mediterranean climate with four well-defined seasons (which are the reverse of those in the Northern Hemisphere). The weather is comparable to that of central and southern California. Regardless of the season, sunblock is strongly recommended for even the shortest leisurely stroll.
Springtime falls between September and November, a mild and temperate time of year and also colorful: this is the time when the plants and trees are flourishing. Temperatures range from a minimum of 6 degrees C (43 degrees F) to 23 degrees C (73 degrees F).
Summer is from December to February, a time of year characterized by hot and dry temperatures ranging from 12 degrees C (53 degrees F) to a high of 34 degrees C (93 degrees F) during the day (with noticeable cooling down at night).
Autumn stretches from March to May, during which time temperatures decrease gradually over time, ranging from 7 degrees C (45 degrees F) up to a maximum of 22 degrees C (72 degrees F).
Winter begins in June and lasts through September, when temperatures rarely exceed 15 degrees C (60 degrees F). Even though this is the coolest time of year, the average temperatures rarely drop below freezing. Due to an inversion effect, smog in the city normally peaks during the winter months
The rainy season begins in April, but reaches its peak during June and July, during which time the average total rainfall averages as high as 3 inches (the annual rainfall for the city is 15 inches).