January weather forecast
San Andres, El Salvador

January, the same as December, in San Andres, El Salvador, is another hot winter month, with an average temperature varying between 18.9°C (66°F) and 31.5°C (88.7°F).

Temperature

As San Andres transitions from December to January, the average high-temperatures adjust to a still hot 31.5°C (88.7°F), nearly the same as the previous 30.8°C (87.4°F). San Andres records a marked daily temperature contrast, with an average low-temperature of 18.9°C (66°F) during the nights of January.

Heat index

The heat index in January is appraised at a fiery hot 37°C (98.6°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
Observations indicate that the heat index values are for shady locations with light wind. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

In San Andres, the average relative humidity in January is 63%.

Rainfall

January is the month with the least rainfall. Rain falls for 1.5 days and accumulates 1mm (0.04") of precipitation.

Daylight

In January, the average length of the day is 11h and 25min.
On the first day of the month, sunrise is at 06:21 and sunset at 17:40. On the last day of January, in San Andres, sunrise is at 06:24 and sunset at 17:57 CST.

Sunshine

The months with the least sunshine in San Andres, El Salvador, are January and December, with an average of 7.7h of sunshine.

UV index

The months with the lowest UV index are January, June through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.
Note: The average daily UV index of 6 in January transforms into the following instructions:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.