Weather in Santiago in September
September in Santiago is cool with average temperatures around 12.5°C (54.5°F). Light rainfall with only 15mm expected.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
19.4°C
66.9°F
Low
5.5°C
41.9°F
Precipitation
15 mm
0.6 inches
~3 rainy days
Conditions
Humidity
49%
Comparison to Adjacent Months
September is 25mm drier than August.
September is 2.5°C cooler than October.