Best time to visit Santiago: September–November & March–May.
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September–November & March–May is the best window to visit Santiago. Mild spring or autumn temperatures, avoiding both summer heat and winter cold.
June–August is the stretch to avoid if possible. Cold, occasionally rainy winter weather, with more smog trapped in the valley.
Not necessarily — weather and crowd timing don't always match the cheapest airfare windows. Check our Best Time to Book Flights tool separately for pricing.
Usually yes — the weeks just before or after Santiago's best window often have nearly as good weather with noticeably fewer crowds and lower prices.