Buenos Aires is in the Southern Hemisphere, so the seasons run opposite to North America and Europe.
Summer Dec – Feb
Peak warmth: highs of 79–82°F (26–28°C). It's the wettest season, with about 12.6 in (319 mm) of rain, 29% of the year's total. Lows bottom out around 68°F (20°C). Comfort peaks here: December – February rank with the year's best, and the season averages 86/100.
Autumn Mar – May
Temperatures slide from 76°F highs in March to 63°F by May. About 11.6 in (295 mm) of rain falls across these months, 27% of the year's total. Lows bottom out around 55°F (13°C). April & May are among the best-scoring months (season average 84/100).
Winter Jun – Aug
The cold peaks here: highs of 56–59°F (13–15°C), and nights reach 48°F (9°C). It's the driest season, with only about 7.8 in (197 mm) of rain, 18% of the year's total. Comfort scores bottom out in June & July; the season averages 76/100.
Spring Sep – Nov
Temperatures climb through the season, from 63°F highs in September to 74°F by November. About 11.5 in (293 mm) of rain falls across these months, 27% of the year's total. Lows bottom out around 53°F (12°C). November is among the best-scoring months (season average 85/100).