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The Santiago forum's spring thread is a corrective for anyone reading October as southern-hemisphere summer: it is when the weather is only starting to turn, and the days are not mild yet. November and December are when it settles into warm days that are never too hot, around 80 to 85F, with a light sweater still wanted after dark. The coast is its own case - the Humboldt current keeps it cool once the sun goes down, jacket weather at any time of year. On smog, regulars are clear that it is a winter problem, worst around the airport on the west side and not normally bad in the eastern parts of the city. The record: 23.9C days but 6.9C nights, 5.2 precipitation days, 11.2 hours of sun, AQI 84.

Forum posters describe August across central Chile's Santiago/Viña del Mar corridor as cold and rainy, with Santiago itself seeing lows around 0-5C and highs 12-22C - conditions that grow milder heading north and colder, wetter heading south. Valparaiso's own coastal setting, right on the Pacific, tends to run a touch milder and less extreme day-to-day than inland Santiago, without Santiago's sharper temperature swings between a cold morning and a much warmer afternoon. Posters note this is genuinely winter in Chile, so beach weather is off the table at either Valparaiso or nearby Viña. Posters do flag a real upside: August draws noticeably fewer crowds than the summer season, appealing to travelers who prefer a quieter visit. Posters generally rate August as cold, damp and distinctly winter for Valparaiso, but with real crowd-avoidance appeal for those prepared for the weather.

February is peak Chilean holiday season and the coast is crowded for it — mid-February is the high point of the high season, and the forum's advice is to book lodging and flights as early as you can. The weather note that matters is the contrast: while Santiago is blazing hot and half-emptied out in February, Valparaíso stays coastal and moderate, averaging only about 19°C by day and 15 overnight, with no rain at all across the month. The sea is cooler still, near 17°C. Bring a layer for the evening — this is not a hot beach summer, it is a mild one.