January weather forecast
Usulutan, El Salvador

In January, Usulutan, El Salvador shows signs of pleasant weather which tends to be consistent during this month. Comfortable temperatures are typically experienced, with the daily highs reaching up to 31.8°C (89.2°F) and the lows dropping to around 21°C (69.8°F). January signifies a transition into a cycle marked by increasing daylight hours and humidity levels. With minimal rainfall and considerably clear visibility, outdoor activities could be enjoyed extensively. Also, the winds stay relatively calm, contributing to the overall agreeable weather.

Temperature

During January, Usulutan observes a subtle ascent to a still tropical 31.8°C (89.2°F) from December's 31.1°C (88°F) in the average high-temperature. The average temperature during January nights is registered at a pleasant 21°C (69.8°F).

Heat index

For January, the heat index is appraised at a fiery hot 38°C (100.4°F). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', measures the perceived warmth when incorporating the humidity present in the air. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In January, the average relative humidity is 63%.

Rainfall

January is the month with the least rainfall. Rain falls for 2.6 days and accumulates 1mm (0.04") of precipitation.

Daylight

In Usulutan, El Salvador, the average length of the day in January is 11h and 26min.
On the first day of January in Usulutan, sunrise is at 06:16 and sunset at 17:37. On the last day of the month, sunrise is at 06:20 and sunset at 17:53 CST.

Sunshine

In Usulutan, El Salvador, the average sunshine in January is 7.7h.

UV index

January through September and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: A maximum high daily UV index of 7 during January translates into the following directions:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. During bright days, sunglasses that offer UVA and UVB defense are recommended.