WanderWhen

Santiago weather in September

September is one of the best months to visit Santiago. Expect highs around 19°C, lows near 9°C, and about 6.3 days with rain.

10.0 · Excellenttravel score for September
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Avg high
19°C
Avg low
9°C
Rainfall
31 mm
Rain days
6.3
Sunshine
9.2 h/day
Daylight
11.8 h

What to pack for Santiago in September

  • long sleeves and a warm layer
  • a medium jacket
  • a packable rain layer

Humidity averages 69%; max daily wind around 13 km/h.

How September compares

January: 9.0/10 JFebruary: 9.0/10 FMarch: 10.0/10 MApril: 10.0/10 AMay: 10.0/10 MJune: 7.8/10 JJuly: 8.7/10 JAugust: 9.3/10 ASeptember: 10.0/10 SOctober: 10.0/10 ONovember: 10.0/10 NDecember: 9.5/10 D

Best months in Santiago: March–May & August–December. See the full best time to visit Santiago guide.

Santiago in September: the details

In September, Santiago sees average daytime highs of 19°C (65°F) and overnight lows of 9°C (47°F). Rainfall totals roughly 31 mm across 6.3 rainy days, and the sun shines about 9.2 hours per day with 11.8 hours of daylight mid-month. Relative humidity averages 69%.

These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Santiago, Chile (-33.46, -70.65) — see our methodology. Actual conditions vary year to year.

Where should you go next month?

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