ArgentinaAverage weather for San Juan in September
It's warm in September in San Juan with an average temperature of 28°C. Temperatures this month range from a low of 23°C to a high of 33°C. At night, you can expect temperatures between 10°C and 17°C.
Start of September
The month of September starts in San Juan with warm temps, averaging around 26°C during the day and nights around 12°C. There’s little chance of precipitation. The weather’s mostly sunny and dry.
Mid September
By mid-September, daytime temps rise to around 29°C, with nights around 14°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
Since it cools down at night, it’s a good idea to wear layers.
End of September
By the end of September, the average daytime temperature in San Juan is around 30°C, while nighttime temps are about 16°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
Because temperatures drop in the evening, wearing layers is recommended.
In September, there is an average of 14 mm of precipitation, spread over 3 days. The wind speed is around 5 Bft, mostly coming from the East.
San Juan in September |
New York | ||
|---|---|---|---|
 Average temperature |
28°C | 27°C | |
 Max. temperature |
33°C | 31°C | |
| Min. temperature |
23°C | -5°C | |
 Total precipitation |
14 mm | 57 mm | |
| Rainy days |
3 days | 9 days | |
August
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit San Juan?
Looking for great weather? September is a good time to be in San Juan. The temperatures are nice, and there’s little chance of rain this month.
Temperature records
With 41°C in 2019, San Juan reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 11°C in 2016. The extreme nighttime temperatures ranged from a lowest recorded value of -1°C to a highest value of 25°C.
Check out the climate of San Juan for all months and discover the best travel time
Curious about the weather in other parts of Argentina? Check out the climate and weather for spots like Buenos Aires, Patagonia, Ushuaia, or explore other destinations in Argentina.
Daily Temperature in September in San Juan
This chart shows the average daily high and low temperatures in September for San Juan, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in San Juan
The chart below shows the average daily precipitation in September for San Juan, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 3 days of precipitation in San Juan.
Daily UV index in September in San Juan
This chart shows the average daily UV index in September in San Juan, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in San Juan over the years
This chart shows the average temperature in September in San Juan, measured in degrees Celsius, over the past few years.
Total precipitation in September in San Juan over the years
This chart shows the average precipitation in September in San Juan, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in September for San Juan
Click on any day in September to get detailed info about the usual weather on that day in San Juan. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in San Juan
Have you been to San Juan in September?
Share your weather experience in September in San Juan.
Average weather in San Juan by month
Click on a month below to see detailed weather info for San Juan. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
