San Juan Weather and Climate: A Comprehensive Guide
San Juan experiences great temperature shifts.
The city's weather can transition from very warm days
to mild weather.
It typically sees modest rain/snowfall throughout the year.
Now, let’s explore all the climate details to give you a full picture.
Average maximum day and minimum night temperature
The climate in San Juan is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 33°C in January to a moderate 18°C in the coolest month, July.
Nights are cooler, with lows often dropping to around 2°C during the colder months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
San Juan has a relatively dry climate with low precipitation, averaging 324 mm of rain/snowfall annually. The climate in San Juan shows significant variation throughout the year. Expect moderate rainfall in December, with an average of 40 mm of precipitation over 4 rainy days. In contrast, June offers drier and sunnier days, with around 12 mm of rainfall over a single rainy day. For more details, please visit our San Juan Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
For those who appreciate different seasons, San Juan serves as an ideal destination. Expect longer, more sun-filled days in December with an average of 11.7 hours of sunshine daily, and embrace the darker days in June, offering only 6.9 hours of daily sunlight. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is moderate throughout the year in San Juan.
The city experiences its highest humidity in June, reaching 63%. In October, the humidity drops to its lowest level at 38%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
clear and no rain almost clear and no rain partly cloudy and thunderForecast for San Juan
4 m/s
6 m/s
6 m/s
Select a Month of Interest
Check the conditions for any month of the year.
The best time of year to visit San Juan in Argentina
During the months of April, May, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Yes, the months of May, June, July and August are very dry.
January has an average maximum temperature of 33°C and is the warmest month of the year.
The coldest month is July with an average maximum temperature of 18°C.
December tops the wettest month list with 40 mm of rainfall.
June is the driest month with 12 mm of precipitation.
December is the sunniest month with an average of 350 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
