San Juan weather and climate in 2024
Day
20 °C
Night
5 °C
Sea
0 °C
Precipitation
8 mm
in month
Rainy days
1 days
in month
Daylight
10 hours
average
Sunshine
7 hours
average
Humidity
65 %
Day
20 °C
Night
5 °C
Sea
0 °C
Precipitation
8 mm
in month
Rainy days
1 days
in month
Daylight
10 hours
average
Sunshine
7 hours
average
Humidity
65 %
Overview: San Juan
Weather charts for San Juan
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Weather overview for San Juan
Weather overview
San Juan, Argentina boasts a semi-arid climate with distinct seasonal variations. Summer months sizzle with daytime temperatures like 34 °C (93 °F) in January, while winter days are mild, as seen with 16 °C (61 °F) in June. Temperatures during the night can plummet, reaching a low of 0 °C (33 °F) in July. Precipitation is minimal throughout the year, but peaks marginally during the summer at 54 mm (2.13 in) in January. As there is no sea nearby, local activities focus on the region's natural beauty and cultural experiences rather than beachgoing, and the overall low humidity and generous sunshine enhance outdoor enjoyment almost year-round.
January weather
January in San Juan welcomes you with heat as the average daytime temperature hits 34 °C (93 °F). The nights are generally warm at 19 °C (65 °F), complementing the sunny days. Rain is sparse, with an average of 5 of rainfall, totaling 54 mm (2.13 in). Expect mostly sunny skies with an impressive 11 hours of sunshine per day.
February weather
February's climate remains warm, with daytime temperatures slightly decreasing to 33 °C (91 °F). Night temperatures average at 17 °C (63 °F), ensuring pleasant evenings. Rain is infrequent with just 5 expected, and a total of 46 mm (1.80 in) of rainfall, while the sun continues to shine for 10 hours per day.
March weather
As autumn approaches in March, the daily temperatures in San Juan start to cool, averaging 30 °C (86 °F). Nighttimes are mild with 15 °C (58 °F). Rainfall slightly decreases to 34 mm (1.35 in) over about 4. The sun continues to grace the skies for 9 hours a day.
April weather
The mildness of April is reflected by the average daytime temperature of 25 °C (77 °F) and a cool 9 °C (49 °F) at night. Additional moisture is rare, with rainfall accumulating to just 13 mm (0.52 in) over 2. Expect plenty of sunshine, with around 8 hours of sun per day.
May weather
May in San Juan offers true autumnal weather with daytime highs of 20 °C (68 °F) and chilly nights averaging 5 °C (41 °F). Expect minimal rainfall, with only 1 seeing precipitation totaling 8 mm (0.33 in). With around 7 hours of daily sun, outdoor activities can be comfortably enjoyed.
June weather
June's winter climate in San Juan presents a gentle chill with an average daytime temperature of 16 °C (61 °F). At night, temperatures dip to about 1 °C (34 °F). Rainfall remains at bay, with just 1 and a slight 3 mm (0.13 in) expected. Sunlight is steady although shorter, with 6 hours of sun hours.
July weather
July is the coldest month in San Juan with a daytime high of 16 °C (61 °F) and a brisk average overnight low of 0 °C (33 °F). Though the fewest daylight hours occur, you will still receive 7 hours of sun. Precipitation barely touches the area, expecting 1 and 5 mm (0.19 in) to fall.
August weather
August sees the slow return of warmth with daytime averages of 19 °C (67 °F) and nightly averages of 3 °C (37 °F). The dry season continues with just over one day of rain, accumulating 5 mm (0.18 in). Sun hours increase to about 8 hours per day, signaling the gradual approach of spring.
September weather
Spring further blooms in September, with an enjoyable average daytime temperature of 22 °C (72 °F). Nights remain cool at 7 °C (44 °F). Rainfall is still low, only an estimated 2 of precipitation equaling 10 mm (0.38 in). The sun shines for 8 hours each day, making for glorious spring weather.
October weather
October in San Juan sees daytime temperatures rising to a warm 28 °C (82 °F) with night temperatures at a comfortable 11 °C (53 °F). A light increase in rainfall marks the month, with 1 and 12 mm (0.47 in). Extended sun exposure is available for 9 hours per day.
November weather
As San Juan heads towards summer in November, temperatures are on the rise with averages of 31 °C (88 °F) during the day and 15 °C (58 °F) at night. Rainfall begins to increase, seen with 2 and 26 mm (1.01 in). The long sun hours amount to 11 hours each day.
December weather
December is warm and inviting in San Juan, with average peak daytime temperatures of 33 °C (92 °F) and balmy nights averaging 18 °C (64 °F). The occasional rain shower might punctuate the month with 3, while average rainfall reaches 37 mm (1.47 in). Sun hour averages linger around 11 hours, providing ample opportunity to enjoy the long days.
FAQs
How should I dress for a day out in San Juan during January?
In San Juan, January days are hot, necessitating lightweight, breathable clothing. A hat, sunscreen, and sunglasses are also recommended due to the high sun hours.
What are the chances of getting rain in San Juan during February?
Rain in February is quite rare, with the month experiencing only about 5 of rainfall, so your chance of encountering a wet day is relatively low.
Does March in San Juan see a significant drop in temperature?
March does bring a noticeable reduction in temperature with daytime highs of 30 °C (86 °F), creating a more comfortable climate than the peak of summer.
Is it common to experience rain in April in San Juan?
Rain is quite uncommon in April, with the city getting rainfall for only about 2 and small accumulations of 13 mm (0.52 in).
How many layers should I wear during May in San Juan?
Given the cool to mild temperatures, dressing in layers is wise for May; you may start off with a few in the cooler morning and peel off as the day warms up.
Do I need to prepare for cold nights in San Juan in June?
Winter nights in June can be cold, so it's a good idea to have warm bedding and clothing suitable for temperatures around 1 °C (34 °F).
Does the temperature in San Juan drop significantly during July nights?
July nights in San Juan can be quite chilly, often reaching a low of 0 °C (33 °F), so you'll need warm clothing for the evening hours.
What type of weather should I expect during August in San Juan?
Expect to experience transitioning weather in August with increasing temperatures and continued dry conditions, typical of San Juan's semi-arid climate.
Are there many sunny days in San Juan during September?
Sunny days are abundant in September, allowing for 8 hours of sunlight, paving the way for various outdoor daytime activities.
Will I need sun protection in San Juan throughout October?
With the high number of sun hours in October, sun protection such as sunscreen, hats, and sunglasses is highly recommended when spending time outdoors in San Juan.
Is November considered a rainy month in San Juan?
November is not particularly rainy; with an average of only 2 experiencing rainfall, it's still considered part of the drier season.
How can I best handle the heat during the day in San Juan in December?
To handle December's heat, it's ideal to stay hydrated, wear light, airy clothing, seek shade during peak sun hours, and use sun protection.
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.