Verdict: Excellent month
Santiago Weather in September
September hits the sweet spot in Santiago — highs around 18°C (64°F), ideal for a full day on foot. Rain is occasional — about 6 wet days in a typical year. Overall, September is one of the best months of the year to be in Santiago.
Average high
18°C / 64°F
Average low
8°C / 46°F
Rain days
~6
Precipitation
31 mm
What to pack for Santiago in September
- Layers — t-shirts under a light jacket or sweater
- Evenings turn genuinely cool — pack a warm layer for after dark
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Santiago: Jan (30°C / 86°F) · Coolest: Jun (15°C / 59°F) · Wettest: Jun (~7 rain days)
30°
15°
Jan
30°
15°
Feb
29°
14°
Mar
24°
12°
Apr
19°
9°
May
15°
8°
Jun
15°
7°
Jul
16°
7°
Aug
18°
8°
Sep
23°
10°
Oct
26°
12°
Nov
29°
14°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)