January weather forecast
San Juan, Argentina

Weather in January

January is a tropical summer month in San Juan, Argentina, with an average temperature fluctuating between 19.4°C (66.9°F) and 30.6°C (87.1°F).

Temperature

January is the warmest month, with an average high-temperature of 30.6°C (87.1°F) and an average low-temperature of 19.4°C (66.9°F).

Heat index

The average heat index in January is evaluated at a tropical 30.4°C (86.7°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, wind, pregnancy, and clothing affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In January, the average relative humidity is 40%.

Rainfall

The month with the most rainfall in San Juan is January, when the rain falls for 9.2 days and typically aggregates up to 29mm (1.14") of precipitation.

Snowfall

January through June, October through December are months without snowfall in San Juan, Argentina.

Daylight

In San Juan, the average length of the day in January is 13h and 56min.
On the first day of the month, sunrise is at 06:33 and sunset at 20:42. On the last day of January, sunrise is at 06:59 and sunset at 20:35 -03.

Sunshine

In San Juan, the average sunshine in January is 9.8h.

UV index

With an average maximum UV index of 7, January is the month with the highest UV index in San Juan. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In January, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the warmest month in San Juan?

With an average high-temperature of 30.6°C (87.1°F) and an average low-temperature of 19.4°C (66.9°F), January is the warmest month.

What is the temperature in January in San Juan?

The average high-temperature, in January, in San Juan, Argentina, is 30.6°C (87.1°F), while the average low-temperature is 19.4°C (66.9°F). In January, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 30.4°C (86.7°F).

What is the average humidity in January in San Juan?

In January, the average relative humidity in San Juan, Argentina, is 40%.

What is the wettest month in San Juan?

The month with the most rainfall in San Juan is January, when the rain falls for 9.2 days and typically aggregates up to 29mm (1.14") of precipitation.

How many days does it rain in January in San Juan?

In San Juan, Argentina, in January, during 9.2 rainfall days, 29mm (1.14") of precipitation is typically accumulated.

When it does not snow in San Juan?

In San Juan, Argentina, snow does not fall in January through June, October through December.

How many hours of daylight does San Juan have in January?

In January, the average day length in San Juan, Argentina, is 13h and 56min.

When is the sunrise / sunset in January in San Juan?

In January, on the first day of the month, sunrise is at 06:33 and sunset at 20:42. On the last day of the month, in San Juan, sunrise is at 06:59 and sunset at 20:35 -03.

How long on average sun shines in January in San Juan?

In January, the average sunshine duration in San Juan, Argentina, is 9.8h.

When is the highest UV index in San Juan?

With an average maximum UV index of 7, January is the month with the highest UV index in San Juan.

What is the UV index intensity in January in San Juan?

The average daily maximum UV index in January in San Juan, Argentina, is 7. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.

Average temperature in January
San Juan, Argentina

Average temperature in January - San Juan, Argentina
  • Average high temperature in January: 30.6°C

The warmest month (with the highest average high temperature) is January (30.6°C).
The month with the lowest average high temperature is July (14.6°C).

  • Average low temperature in January: 19.4°C

The month with the highest average low temperature is January (19.4°C).
The coldest month (with the lowest average low temperature) is July (4.5°C).

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Average pressure in January
San Juan, Argentina

Average pressure in January - San Juan, Argentina
  • Average pressure in January: 1011.1mbar

The month with the highest atmospheric pressure is July (1018.1mbar).
The month with the lowest atmospheric pressure is December (1010.2mbar).

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Average wind speed in January
San Juan, Argentina

Average wind speed in January - San Juan, Argentina
  • Average wind speed in January: 10.6km/h

The windiest months (with the highest average wind speed) are October and November (12.2km/h).
The calmest month (with the lowest average wind speed) is May (8.8km/h).

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Average humidity in January
San Juan, Argentina

Average humidity in January - San Juan, Argentina
  • Average humidity in January: 40%

The months with the highest relative humidity are April and May (52%).
The month with the lowest relative humidity is November (35%).

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Average rainfall in January
San Juan, Argentina

Average rainfall in January - San Juan, Argentina
  • Average rainfall in January: 29mm

The wettest month (with the highest rainfall) is January (29mm).
The driest months (with the least rainfall) are June and July (1mm).

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Average rainfall days in January
San Juan, Argentina

Average rainfall days in January - San Juan, Argentina
  • Average rainfall days in January: 9.2 days

The month with the highest number of rainy days is January (9.2 days).
The month with the least rainy days is August (1.3 days).

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Average snowfall in January
San Juan, Argentina

Average snowfall in January - San Juan, Argentina
  • Average snowfall in January: 0mm

The month with the highest snowfall is July (4mm).
The months with the least snowfall are January, February, March, April, May, June, October, November and December (0mm).

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Average snowfall days in January
San Juan, Argentina

Average snowfall days in January - San Juan, Argentina
  • Average snowfall days in January: 0 days

The months with the highest number of snowfall days are July and September (0.4 days).
The months with the least snowfall days are January, February, March, April, May, June, October, November and December (0 days).

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Average daylight in January /
Average sunshine in January
San Juan, Argentina

Average daylight in January / Average sunshine in January - San Juan, Argentina
  • Average daylight in January: 13h and 56min

The month with the longest days is December (Average daylight: 14h and 10min).
The month with the shortest days is June (Average daylight: 10h and 8min).

  • Average sunshine in January: 9.8h

The months with the most sunshine are August, September and November (Average sunshine: 9.9h).
The months with the least sunshine are March, April, May and October (Average sunshine: 9.7).

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Average sunshine days in January
San Juan, Argentina

Average sunshine days in January - San Juan, Argentina
  • Average sunshine days in January: 15.4 days

The month with the most sunshine days is July (29.7 days).
The month with the least sunshine days is January (15.4 days).

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Average UV index in January
San Juan, Argentina

Average UV index in January - San Juan, Argentina
  • Average UV index in January: 7

The month with the highest UV index is January (UV index 7).
The months with the lowest UV index are May, June and July (UV index 3).

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Average cloud cover in January
San Juan, Argentina

Average cloud cover in January - San Juan, Argentina
  • Average cloud cover in January: 11

The months with the most cloud cover are March, April and May (Cloud cover 12).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in January
San Juan, Argentina

Average visibility in January - San Juan, Argentina
  • Average visibility in January: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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