January weather forecast
San Marcos, El Salvador

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Weather in January

Beginning the year, San Marcos, El Salvador sees a shift in weather conditions from the chilly season of December. January exhibits clear skies with only 13% cloud cover, offering brilliant sunshine for an approximate seven hours. The nights may feel noticeably cooler compared to the heat experienced in December, particularly during the early mornings. Hikers and outdoor enthusiasts might find this time of year ideal for an early morning exercise session. January records relatively minimal rainfall with an average of 2mm (0.08") over just over two days.

Temperature

In January, the average high-temperature registers at a still tropical 31.2°C (88.2°F), nearly identical to December's 30.8°C (87.4°F). San Marcos's January nights cool down significantly from the day's heat, to an average low-temperature of 19°C (66.2°F).

Heat index

In January, the heat index is appraised at a fiery hot 36°C (96.8°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

In January, the average relative humidity is 64%.

Rainfall

January is the month with the least rainfall. Rain falls for 2.3 days and accumulates 2mm (0.08") of precipitation.

Daylight

In January, the average length of the day in San Marcos is 11h and 26min.
On the first day of January in San Marcos, sunrise is at 06:19 and sunset at 17:40. On the last day of the month, sunrise is at 06:23 and sunset at 17:56 CST.

Sunshine

January and December, with an average of 7.7h of sunshine, are months with the least sunshine.

UV index

January through April, with an average maximum UV index of 7, are months with the highest UV index in San Marcos. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In January, a daily maximum UV index of 7 leads to the following instructions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.

Frequently asked questions

How hot is it in January?

The high-temperature, in January, in San Marcos, records 31.2°C (88.2°F), while the low-temperature is 19°C (66.2°F). In January, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is appraised at 36°C (96.8°F).

What is the average humidity in January?

In San Marcos, the average relative humidity in January is 64%.

What is the driest month?

The month with the least rainfall is January, when the rain falls for 2.3 days and typically collects 2mm (0.08") of precipitation.

How many days does it rain in January?

In San Marcos, during January, the rain falls for 2.3 days and regularly aggregates up to 2mm (0.08") of precipitation.

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

In San Marcos, the average day length in January is 11h and 26min.

What time are sunrise and sunset in January?

On the first day of January, sunrise is at 06:19 and sunset at 17:40. On the last day of the month, sunrise is at 06:23 and sunset at 17:56 CST.

What are the months with the least sunshine?

The months with the least sunshine are January and December, with an average of 7.7h of sunshine.

How long on average sun shines in January?

The average sunshine duration in January in San Marcos is 7.7h.

What are the months with the highest UV index?

The months with the highest UV index are January through April, with an average maximum UV index of 7.

What is the UV index reading in January?

In San Marcos, the average daily maximum UV index in January is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in January
San Marcos, El Salvador

Average temperature in January - San Marcos, El Salvador
  • Average high temperature in January: 31.2°C

The warmest months (with the highest average high temperature) are March and April (33.4°C).
The month with the lowest average high temperature is October (29.7°C).

  • Average low temperature in January: 19°C

The month with the highest average low temperature is May (22.6°C).
The coldest month (with the lowest average low temperature) is January (19°C).

Average pressure in January
San Marcos, El Salvador

Average pressure in January - San Marcos, El Salvador
  • Average pressure in January: 1013.6mbar

The month with the highest atmospheric pressure is January (1013.6mbar).
The months with the lowest atmospheric pressure are May and October (1011.3mbar).

Average wind speed in January
San Marcos, El Salvador

Average wind speed in January - San Marcos, El Salvador
  • Average wind speed in January: 8km/h

The windiest month (with the highest average wind speed) is January (8km/h).
The calmest month (with the lowest average wind speed) is June (4.4km/h).

Average humidity in January
San Marcos, El Salvador

Average humidity in January - San Marcos, El Salvador
  • Average humidity in January: 64%

The months with the highest relative humidity are September and October (82%).
The month with the lowest relative humidity is March (61%).

Average rainfall in January
San Marcos, El Salvador

Average rainfall in January - San Marcos, El Salvador
  • Average rainfall in January: 2mm

The wettest month (with the highest rainfall) is May (267mm).
The driest month (with the least rainfall) is January (2mm).

Average rainfall days in January
San Marcos, El Salvador

Average rainfall days in January - San Marcos, El Salvador
  • Average rainfall days in January: 2.3 days

The month with the highest number of rainy days is May (26.9 days).
The month with the least rainy days is January (2.3 days).

Average daylight in January /
Average sunshine in January
San Marcos, El Salvador

Average daylight in January / Average sunshine in January - San Marcos, El Salvador
  • Average daylight in January: 11h and 2min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).

  • Average sunshine in January: 7h and 4min

The month with the most sunshine is April (Average sunshine: 11h and 18min).
The months with the least sunshine are January and December (Average sunshine: 7h and 42min).

Average sunshine days in January
San Marcos, El Salvador

Average sunshine days in January - San Marcos, El Salvador
  • Average sunshine days in January: 27.7 days

The month with the most sunshine days is January (27.7 days).
The month with the least sunshine days is September (2.5 days).

Average UV index in January
San Marcos, El Salvador

Average UV index in January - San Marcos, El Salvador
  • Average UV index in January: 7

The months with the highest UV index are January, February, March and April (UV index 7).
The months with the lowest UV index are May, June, July, August, September, October, November and December (UV index 6).

Average cloud cover in January
San Marcos, El Salvador

Average cloud cover in January - San Marcos, El Salvador
  • Average cloud cover in January: 13

The month with the most cloud cover is September (Cloud cover 41).
The month with the least cloud cover is January (Cloud cover 13).

Average visibility in January
San Marcos, El Salvador

Average visibility in January - San Marcos, El Salvador
  • Average visibility in January: 10km

The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are June, August, September and October (8km).

San Marcos, El Salvador

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