The climate of San Juan
San Juan, located in
Argentina, experiences a Mid-latitude desert climate categorized under the Köppen climate classification as BWk. Throughout the year, San Juan's weather is characterized by moderate temperatures, low humidity levels, sparse rainfall, and ample sunlight exposure.
The temperature spectrum in San Juan ranges significantly, with a low of 4.5°C (40.1°F) recorded in
July and a high of 30.6°C (87.1°F) noted in
January. Generally, the yearly average temperature swings between these two extremes due to the desert climate. Regarding rainfall, the annual distribution is relatively uniform, with a record low of 1mm (0.04") per month during the winter months -
June and July - and extends to a high of 29mm (1.14") in January. The number of rainfall days parallels the volume patterns, surging from a low of 1.3 days in
August to a high of 9.2 days in January.
The humidity levels, as expected in a desert climate, are quite moderate, fluctuating from 35% in
November to 52% in
April and
May. An intriguing aspect to note is that despite its desert classification, San Juan experiences minute amounts of snowfall concentrated primarily in June, July and August. Furthermore, while the city boasts an average visibility of 10km (6.2mi) throughout the year, the daylight hours stretch from 10.1h in June to a peak of 14.2h in
December. The sunshine hours experience less variation, remaining fairly steady at 9.8h per day on average.
The best time to visit San Juan
The ideal time to visit
San Juan would be in the spring months -
September,
October and
November. During this time, the daytime temperatures vary from 20.5°C (68.9°F) to 27.6°C (81.7°F), making for a pleasant climate conducive to outdoor activities. Sunshine occurs for roughly 9.8h to 9.9h per day, coupled with moderate rainfall of 2mm (0.08") to 8mm (0.31"), assuring enjoyable weather for visitors. Furthermore, the sightseeing experience could be enhanced as the relative humidity levels are comparably lower - 38% in September to 35% in November.
The worst time to visit San Juan
The winter period from
June to
August is considered less favorable for travels to
San Juan. The temperatures during these months drop to their lowest of the year, ranging from 14.6°C (58.3°F) to 18.3°C (64.9°F) across the day, even plummeting to lows of 4.5°C (40.1°F) to 7.3°C (45.1°F) at night. Although the rainfall is minimal during this time, days are shorter and the city sees a drop in the average sunlight hours, 10.1h to 11h per day, which could influence outdoor activities and sightseeing.
Spring weather in San Juan
During the spring, the weather in
San Juan takes a pleasant turn. Day temperatures from
September to
November ascend from 20.5°C (68.9°F) to 27.6°C (81.7°F), while the nights host temperature drops to 9°C (48.2°F) and 14.9°C (58.8°F). Springtime also introduces a rise in average daylight hours, from 11h in September to 13.7h in November, alongside a steady sunshine duration of around 9.7h to 9.9h daily. This season sees minimal precipitation, and its relative humidity stands at an average of 37% across the three months, offering a comfortable atmosphere for outdoor exploration.
Summer weather in San Juan
Summers in
San Juan are characterized by hot conditions. Between
December to
February, the scorching daytime temperature soars to its peak, ranging from 29.8°C (85.6°F) to 30.6°C (87.1°F), cooling down slightly during night from 17.5°C (63.5°F) to 19.4°C (66.9°F). Despite the high temperatures, rainfall remains fairly low at 14mm (0.55") to 16mm (0.63"). These months experience the longest daylight hours of the year, extending from 13.7h in December to 13.9h in
January. The direct sunlight duration is consistent, averaging 9.8h per day across the season.
Autumn weather in San Juan
The autumnal months of
March,
April, and
May in
San Juan witness a gradual fall in temperatures. The daytime temperature in March starts at 26.7°C (80.1°F) and slowly drops to 19°C (66.2°F) in May, while the night temperatures cool down from 16°C (60.8°F) to 9.2°C (48.6°F). These months also encounter slightly increased rainfall, with April recording the highest rainfall of the season at 3mm (0.12"). Despite the temperatures gradually falling, the sunshine amount manages to stay approximately consistent at approximately 9.7h per day.
Winter weather in San Juan
Winter in
San Juan is cold and receives minimal precipitation. The low temperatures vary across
June,
July, and
August, from 14.6°C (58.3°F) to 18.3°C (64.9°F), dipping further down at night to a chilly range of 4.5°C (40.1°F) to 7.3°C (45.1°F). Interestingly, despite its desert climate, San Juan experiences slight snowfall during these months, mainly in June and August, with 4mm (0.16") and 2mm (0.08") registered respectively. Yet, these months do boast an average of 9.8h of daily sunshine, indicating that the city's desert classification remains a steadfast part of its overall climate characteristics.
Weather in January
January represents the height of summer in
San Juan,
Argentina, with conditions largely dominated by warm temperatures. High temperatures peak at an average of 30.6°C (87.1°F), with evenings cooling down to a more comfortable average of 19.4°C (66.9°F).
Weather in January » Weather in February
February is the last of the summer months and maintains a high level of warmth throughout. The transition from
January is barely noticeable, with only a slight decrease in maximum temperatures to 29.1°C (84.4°F). Argentinians celebrate the day of national sovereignty this month, often basking in the 13.2 hours of daylight.
Weather in February » Weather in March
March marks the onset of autumn in
San Juan with milder weather characteristics. Though temperatures start to dip, staying within a range of 19.4°C (66.9°F) to 26.7°C (80.1°F), many days remain warm. The UV index remains at 6, so adequate protection against the sun is crucial, even outside of the summer months.
Weather in March »
Weather in April
April continues to cool the city as thermal attire becomes indispensable. A notable decline in temperatures is observed, with highs settling near 22.9°C (73.2°F). This month is known for its excellent visibility, with clear skies throughout the day.
Weather in April » Weather in May
Further deepening into autumn,
May brings an appreciable reduction in temperatures. The weather favours the onset of winter as the highest daily temperatures only go up to an average of 19°C (66.2°F). Despite a reduction in the UV index to 3, daylight hours still remain sufficient for outdoor activities.
Weather in May »Weather in June
June signals the arrival of winter in
San Juan,
Argentina. Chilly nights with average lows of 6.2°C (43.2°F) set a contrast to the milder daytime temperatures. Despite the decrease in temperature, the sun continues to shine, with daylight hours stretching up to 10.1 on average.
Weather in June »
Weather in July
July is the coolest month of the year in
San Juan, with minimum temperatures dropping to an average of just 4.5°C (40.1°F). This period offers the chance to experience winter in
Argentina in its full form. Although snowfall in San Juan is not a common occurrence, July sees trace amounts accumulating which can make for a picturesque setting.
Weather in July » Weather in August
August brings a welcome relief from the intense cold of
July, with the mercury rising slightly. The city begins to awaken from its winter sleep as temperatures start climbing up to 18.3°C (64.9°F). The daylight hours continue to increase, granting
San Juan an additional 11 hours of sunlight on average.
Weather in August » Weather in September
In
September, spring arrives in
San Juan, heralding a steady rise in temperatures. The weather is particularly pleasing, with the mercury reflecting a well-balanced range. The average wind speed in San Juan further rises to 11.1km/h (6.9mph), a clear sign that the transition from winter to spring is underway.
Weather in September »
Weather in October
October exhibits further warming, with an upswing in the city's climate. The people of
San Juan continue to relish the spring weather as the temperatures start touching an average high of 23.8°C (74.8°F). The wind speed reaches a high as well, reaching average speeds of 12.2km/h (7.6mph) which helps keep the city feeling fresh and invigorating.
Weather in October » Weather in November
As
November unfolds, summer starts making its presence felt in
San Juan again. The city sees the mercury slowly begin to climb, lending warmth to the air of
Argentina. Interestingly, despite the trend of rising temperatures, November sees a slight decrease in daylight hours.
Weather in November »Weather in December
December welcomes full-fledged summer to
San Juan,
Argentina. It is primarily characterised by a further rise in temperatures, where the days warm up to nearly 29.8°C (85.6°F) on average. However, this is balanced by cooler nights which offer some relief from the heat of the day.
Weather in December » [Resources]