San Antonio climate — normals and trends
San Antonio (Chile) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 13.4 °C and it receives 372 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is January (17.0 °C on average) and the coldest is July (9.9 °C). Rainfall peaks in June.
San Antonio averages 0 frost days, 0 hot days (≥ 30 °C) and 32 rainy days per year.
No statistically significant temperature trend emerges for San Antonio between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.
The hottest day of the period reached 28.9 °C (on 20 March 2015) and the coldest 0.0 °C (on 13 June 1967).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
San AntonioValparaiso
- coords
- -33.59°, -71.61°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.4°C
Average daily high
17.3°C
Average daily low
10.1°C
Annual rainfall
372mm
Sunshine / day
10.9h
Mean relative humidity
81%
Average peak wind
18.3km/h
Seasonal range
7.1°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
32 d/yr
Annual snowfall
0.0 cm
Average feels-like high
16.5 °C
Average feels-like low
8.7 °C
Average peak gust
33.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
20.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
No clear trend over this period
Over a short window, year-to-year swings outweigh the climate signal. Try 86 years.
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
28.9 °C
20 March 2015
Coldest day
0.0 °C
13 June 1967
Wettest day
109 mm
24 June 1962
Windiest day
52.3 km/h
6 July 2010
Strongest gust
106.9 km/h
11 June 1940
Hottest feels-like
28.5 °C
31 January 2024
Coldest feels-like
-4.0 °C
16 July 1995
Snowiest day
1.3 cm
15 July 2017
Sunniest day
14.0 h
13 December 2024
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 20.9 °C | +0.2 °C | 0 mm | -1 mm |
| Feb | 20.9 °C | +0.3 °C | 0 mm | -1 mm |
| Mar | 19.6 °C | -0.3 °C | 14 mm | +11 mm |
| Apr | 17.3 °C | -0.7 °C | 5 mm | -10 mm |
| May | 16.0 °C | +0.1 °C | 60 mm | -1 mm |
| Jun | 13.7 °C | -0.4 °C | 73 mm | -36 mm |
| Jul | 14.4 °C | +0.9 °C | 46 mm | -39 mm |
| Aug | 14.9 °C | +0.8 °C | 91 mm | +37 mm |
| Sep | 16.1 °C | +1.0 °C | 44 mm | +16 mm |
| Oct | 18.2 °C | +1.4 °C | 2 mm | -9 mm |
| Nov | 18.6 °C | +0.1 °C | 1 mm | -3 mm |
| Dec | 20.4 °C | +0.5 °C | 5 mm | +3 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of San Antonio?
San Antonio has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 13.4 °C and it receives 372 mm of precipitation per year.
What is the hottest day ever recorded in San Antonio?
The hottest day measured in San Antonio between 1940 and 2025 was 20 March 2015, reaching 28.9 °C.
What is the coldest day in San Antonio?
The coldest day measured in San Antonio between 1940 and 2025 was 13 June 1967, at 0.0 °C.
Does it snow in San Antonio?
Almost never: San Antonio sees virtually no snow, with about 0 frost days per year.
Has the climate of San Antonio warmed?
Between 1940 and 2025, no statistically significant temperature trend emerges in San Antonio.
What is the wettest day in San Antonio?
The wettest day measured in San Antonio between 1940 and 2025 was 24 June 1962, with 109 mm of rain in 24 hours.
What was the windiest day in San Antonio?
The windiest day measured in San Antonio between 1940 and 2025 was 6 July 2010, with winds reaching 52.3 km/h.
What is the warmest month in San Antonio?
The warmest month in San Antonio is January (17.0 °C on average); the coldest is July (9.9 °C).
How much does it rain in San Antonio?
San Antonio receives on average 372 mm of precipitation per year, spread over about 32 rainy days.
Is it sunny in San Antonio?
San Antonio gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
What is the biggest single-day snowfall in San Antonio?
The heaviest 24-hour snowfall measured in San Antonio between 1940 and 2025 was 15 July 2017, with 1.3 cm.
Are there tropical nights in San Antonio?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in San Antonio.
What was the most extreme apparent temperature in San Antonio?
In San Antonio, between 1940 and 2025, the highest apparent temperature reached 28.5 °C on 31 January 2024, and the lowest was -4.0 °C on 16 July 1995.
Compare San Antonio with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Antonio