The best times to visit San Juan for ideal weather are
February 19th to May 6th
or
August 27th to November 18th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
San Juan Travel Guide
Other San Juan Travel Info
Weather in San Juan
Temperature
Average temperatures in San Juan vary greatly. Considering humidity, temperatures feel very nice much of the year, but hot in the summer and cold in the winter with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 52nd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit San Juan, the hottest months are January, December, and then February. See average monthly temperatures below. The warmest time of year is generally early to mid January where highs are regularly around 98.6°F (37°C) with temperatures rarely dropping below 68°F (20°C) at night.
San Juan Temperatures (Fahrenheit)
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San Juan Temperatures (Celsius)
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“Feels-Like” Temperatures
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
San Juan Perceived Temperature (F)
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San Juan Perceived Temperature (C)
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Average San Juan Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
Show Fahrenheit
Month | Avg. High (°F) | Avg. Mean (°F) | Avg. Low (°F) |
---|---|---|---|
Jan | 97.2 | 81.8 | 68 |
Feb | 93 | 78.1 | 65.6 |
Mar | 88.6 | 73.8 | 61.3 |
Apr | 80.5 | 65 | 52.2 |
May | 70.9 | 55.1 | 41.4 |
Jun | 65.4 | 48.2 | 32.1 |
Jul | 63.7 | 46.2 | 29.7 |
Aug | 69.7 | 52.2 | 35.9 |
Sep | 75.9 | 59.2 | 43.8 |
Oct | 84.1 | 67.7 | 52.6 |
Nov | 91 | 74.5 | 59.2 |
Dec | 95.6 | 79.7 | 64.6 |
Show Celsius
Month | Avg. High (°C) | Avg. Mean (°C) | Avg. Low (°C) |
---|---|---|---|
Jan | 36.2 | 27.7 | 20 |
Feb | 33.9 | 25.6 | 18.7 |
Mar | 31.4 | 23.2 | 16.3 |
Apr | 26.9 | 18.3 | 11.2 |
May | 21.6 | 12.8 | 5.2 |
Jun | 18.6 | 9 | 0.1 |
Jul | 17.6 | 7.9 | -1.3 |
Aug | 20.9 | 11.2 | 2.2 |
Sep | 24.4 | 15.1 | 6.6 |
Oct | 28.9 | 19.8 | 11.4 |
Nov | 32.8 | 23.6 | 15.1 |
Dec | 35.3 | 26.5 | 18.1 |
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in San Juan are October, June, and then July. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late April. For example, on the week of April 23rd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid February with an average of 1 days of significant precipitation the week of February 12th.
When can you find snow in San Juan? Weather stations report very large amounts of snow likely to be deepest around April, especially close to early April. The best time to ski (if at all) in San Juan is often around around April 2nd when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in San Juan.
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Snow on the Ground
The graph below shows the average snow on the ground in San Juan (in).
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Average Rain and Snow by Month
Show Inches
Month | Daily Chance of Rain | Average Snow Depth (in) | Total Precipitation (in) |
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Jan | 8% | 0 | 1.9 |
Feb | 7% | 0 | 1.2 |
Mar | 6% | 0 | 0.9 |
Apr | 2% | 23.6 | 1.1 |
May | 1% | 11.8 | 0.6 |
Jun | 0% | 1.6 | 0.3 |
Jul | 1% | 19.7 | 0.4 |
Aug | 1% | 0 | 0.5 |
Sep | 2% | 13.8 | 0.7 |
Oct | 0% | 0 | 0 |
Nov | 4% | 0 | 0.4 |
Dec | 4% | 0 | 1.4 |
Show Centimeters
Month | Daily Chance of Rain | Average Snow Depth (cm) | Total Precipitation (cm) |
---|---|---|---|
Jan | 8 | 0 | 4.8 |
Feb | 7 | 0 | 3 |
Mar | 6 | 0 | 2.3 |
Apr | 2 | 59.9 | 2.8 |
May | 1 | 30 | 1.5 |
Jun | 0 | 4.1 | 0.8 |
Jul | 1 | 50 | 1 |
Aug | 1 | 0 | 1.3 |
Sep | 2 | 35.1 | 1.8 |
Oct | 0 | 0 | 0 |
Nov | 4 | 0 | 1 |
Dec | 4 | 0 | 3.6 |
Humidity and Wind
San Juan has some comfortably humid months, and dry months in the opposite season. The least humid month is December (26.2% relative humidity), and the most humid month is May (46.2%).
Wind in San Juan is usually moderate. The windiest month is November, followed by December and October. November’s average wind speed of around 9.3 knots (10.7 MPH or 17.2 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late November to early December where average top sustained speeds reach 17.6 knots, which is considered a fresh breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in San Juan.
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Wind
The graph below shows wind speed (max and average) in knots.
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Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
Month | Avg. Wind | Avg. Wind Feel | Sustained High Wind | High Wind Feel |
Jan | 8.5 | Gentle breeze | 15.8 | Significant breeze |
Feb | 8.4 | Gentle breeze | 16 | Significant breeze |
Mar | 7.4 | Gentle breeze | 13.6 | Significant breeze |
Apr | 6.4 | Light breeze | 12.1 | Significant breeze |
May | 5.3 | Light breeze | 10.6 | Significant breeze |
Jun | 5.4 | Light breeze | 11.3 | Significant breeze |
Jul | 6.1 | Light breeze | 12.2 | Significant breeze |
Aug | 7 | Gentle breeze | 13.2 | Significant breeze |
Sep | 7.7 | Gentle breeze | 14.1 | Significant breeze |
Oct | 8.8 | Gentle breeze | 15.8 | Significant breeze |
Nov | 9.3 | Gentle breeze | 16.6 | Significant breeze |
Dec | 9.1 | Gentle breeze | 16.4 | Significant breeze |
Show Relative Humidity by Month
Month | Avg. Relative Humidity |
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Jan | 30.6% |
Feb | 37.5% |
Mar | 39.9% |
Apr | 41.7% |
May | 46.2% |
Jun | 38.9% |
Jul | 33.9% |
Aug | 28.9% |
Sep | 26.9% |
Oct | 26.3% |
Nov | 26.3% |
Dec | 26.2% |
Is it Safe to Travel to San Juan?
Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for Argentina; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Nov 21, 2023.
The Busiest and Least Crowded Months
The busiest month for tourism in San Juan, Argentina is November, followed by September and December. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit San Juan in May. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
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Overall San Juan Travel Experience by Season
Fall (March through May)
Humidity and temperatures combine to make this season feel warm. Highs range from 91.7°F (33.2°C) and 66.7°F (19.3°C) with colder temperatures in the later months. Rain is rare with 0 to 2 days of significant precipitation per month. Fall is fairly slow for tourism, which makes it a good time for those looking for deals.
Winter (June through August)
The middle-year months have cold weather with high temperatures that are comfortable. These months see the least precipitation with about 0 days of precipitation per month. June – August is the slowest season for tourism in San Juan, so lodging and other accommodations may cost less than usual.
Spring (September through November)
Spring daily highs range from 93.5°F (34.2°C) and 74.5°F (23.6°C), which will feel very nice given the humidity and wind. It rains or snows a barely noticeable amount: 0 to 1 days per month. Tourism is the busiest during these months due to the weather, so hotels may be higher priced.
Summer (December through February)
Weather is perfect this time of year in San Juan to be enjoyable for warm weather travelers. The average high during this season is between 98.6°F (37°C) and 88.8°F (31.6°C). On average, it rains or snows a smalll amount: 1 to 2 times per month. These times of year are the second busiest with tourists.
Best Times to Travel› Argentina › San Juan, Argentina