Santiago weather in August
In August, Santiago has an average high of 20 °C68 °F and an average low of 7 °C45 °F, with about 40 mm1.6 in of precipitation. It is the 10th warmest month of the year and ranks 4th for precipitation.
How August compares with other months
Compared with July, August is 1.3 °C2.3 °F warmer on average and drier by 7 mm0.3 in. Compared with September, August is 2.1 °C3.8 °F cooler on average and wetter by 25 mm1.0 in. Daylight lasts about 10.9 hours around the middle of the month. Average relative humidity is 52% and the average cloud amount 72%.
Is August a good time to visit Santiago?
Yes — August is one of the most comfortable months to visit Santiago by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in August
For Santiago in August, pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
August in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Santiago | 2068 | 745 | 401.6 |
| Colina | 2169 | 847 | 361.4 |
| Rancagua | 1967 | 745 | 441.7 |
| Viña del Mar | 1966 | 948 | 502.0 |
| Valparaíso | 1456 | 1051 | 421.6 |
| Curicó | 1763 | 643 | 542.1 |
| Mendoza | 1865 | 338 | 90.4 |
| Talca | 1559 | 540 | 813.2 |
| San Rafael | 1763 | 337 | 160.6 |
Nearby places that are more than 1 °C1.8 °F cooler: Valparaíso, Curicó, Mendoza and Talca.
Other months in Santiago
- January34 °C92 °F / 18 °C65 °F
- February32 °C90 °F / 18 °C64 °F
- March31 °C87 °F / 16 °C61 °F
- April27 °C80 °F / 13 °C56 °F
- May23 °C73 °F / 10 °C50 °F
- June19 °C66 °F / 7 °C45 °F
- July18 °C65 °F / 6 °C43 °F
- August20 °C68 °F / 7 °C45 °F
- September23 °C73 °F / 9 °C48 °F
- October26 °C79 °F / 11 °C52 °F
- November30 °C86 °F / 14 °C57 °F
- December32 °C90 °F / 16 °C62 °F
Frequently asked questions
How warm is Santiago in August?
In August the average high in Santiago is 20 °C (68 °F) and the average low is 7 °C (45 °F).
Does it rain a lot in Santiago in August?
On average about 40 mm (1.6 in) of precipitation falls in August; it ranks 4th of the 12 months.
Is August the warmest month in Santiago?
No. The warmest month in Santiago is January, with an average high of 34 °C (92 °F). The coldest month is July, with an average low of 6 °C (43 °F).
How long is the day in Santiago in August?
In the middle of August the day in Santiago lasts about 10.9 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Santiago in August?
The average relative humidity in August is about 52%. This is a long-term average for the whole day.
How cloudy is Santiago in August?
On average about 72% of the sky is covered by cloud in August. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 1,154 m, while Santiago lies at about 556 m. Temperatures on this page were therefore adjusted by +3.9 °C7 °F using the standard lapse rate of 6.5 °C per 1,000 m.