San Isidro Temperature by Month

San Isidro in Buenos Aires Province, Argentina sees significant seasonal temperature differences, with daytime highs between 15°C (59°F) in July and 29°C (84°F) in January, averaging 22°C (72°F) annually. Explore the full monthly breakdown below.

The climate in San Isidro is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 20°C (68°F) in January to 8°C (46°F) in July.

The chart below illustrates the average maximum day and minimum night temperatures in San Isidro by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. January, the city's warmest month, gets 285 hours of sunshine.

The chart below shows the average temperature throughout the year:

San Isidro's average annual maximum temperature is 22°C (72°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.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot summers.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

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 Isidro, July is the coolest month, with average highs of 15°C (59°F) and humidity around 79%, considered high. In January, the warmest month, temperatures average 29°C (84°F) with 64% humidity, conditions that feel 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 Isidro's weather, including monthly rainfall, sunshine hours, and humidity, visit our San Isidro climate page.