January weather forecast
San Francisco Lempa, El Salvador

January, like December, is another hot winter month in San Francisco Lempa, El Salvador, with temperature in the range of an average low of 18.9°C (66°F) and an average high of 31.5°C (88.7°F).

Temperature

The average high-temperature during January registers at a still tropical 31.5°C (88.7°F), closely corresponding to the preceding month. San Francisco Lempa experiences a significant downturn from peak daytime temperatures throughout January, with the average low-temperature dipping to an enjoyable 18.9°C (66°F).

Heat index

The heat index value for January is appraised at a sweltering 37°C (98.6°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

The month with the least rainfall is January, when the rain falls for 1.5 days and typically collects 1mm (0.04") of precipitation.

Daylight

In San Francisco Lempa, the average length of the day in January is 11h and 25min.
On the first day of January, sunrise is at 06:19 and sunset at 17:39. On the last day of the month, sunrise is at 06:23 and sunset at 17:55 CST.

Sunshine

The months with the least sunshine in San Francisco Lempa 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 of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: A maximum UV index of 6 in January translates into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.