San Antonio Temperature by Month
San Antonio, Valparaíso Region, Chile has a consistently pleasant climate year-round, with daytime highs averaging 18°C (64°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.
San Antonio Monthly Temperatures
The climate in San Antonio remains fairly constant, offering pleasant temperatures throughout the year. Maximum daytime temperatures reach a pleasant 22°C (72°F) in January, dropping to a moderate 15°C (59°F) in July. Nighttime lows stay between 14°C (57°F) and 7°C (45°F).
The chart below illustrates the average maximum day and minimum night temperatures in San Antonio by month:
The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. January, the city's warmest month, averages 280 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: San Antonio vs Chile
The map below shows the annual temperature across Chile. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
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San Antonio vs World: Temperature Compared
San Antonio's average annual maximum temperature is 18°C (64°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in San Antonio?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In San Antonio, July is the coolest month, with average highs of 15°C (59°F) and humidity around 80% — considered very high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on San Antonio's weather — including monthly rainfall, sunshine hours, and humidity — visit our San Antonio climate page.
