January weather forecast
Petaling Jaya, Malaysia

January in Petaling Jaya, Malaysia witnesses a somewhat cooler climate due to a lower average monthly temperature from 22.9°C (73.2°F) to 31.2°C (88.2°F). Comparatively less humid than other months, it also has the least hours of sunshine (7.4 hours) to warm your skin. Transitioning from December, a slight drop in relative humidity at 80% brings a hint of freshness in the air. Blocked by patches of fluffy, post-rain clouds, only 7.8 hours of sunshine pierce through the vast mist, illuminating the city. Moving ahead, February promises slightly warmer days and less rainfall.

Temperature

January's arrival registers an average high-temperature of a still hot 31.2°C (88.2°F), closely aligning with the temperature of the previous month. Petaling Jaya's temperature tends to fall to an average low of 22.9°C (73.2°F) during the nights of January.

Heat index

In January, the heat index is calculated to be a scorching 42°C (107.6°F). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
Remember that heat index calculations are made for conditions in the shade with light wind. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'apparent temperature', evaluates the perceived heat by adding the effect of moisture in the air. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In Petaling Jaya, the average relative humidity in January is 80%.

Rainfall

In Petaling Jaya, during January, the rain falls for 21.3 days and regularly aggregates up to 85mm (3.35") of precipitation. Throughout the year, there are 309.8 rainfall days, and 1481mm (58.31") of precipitation is accumulated.

Daylight

In Petaling Jaya, the average length of the day in January is 11h and 58min.
On the first day of the month, sunrise is at 7:18 am and sunset at 7:15 pm. On the last day of January, sunrise is at 7:27 am and sunset at 7:26 pm +08.

Sunshine

The average sunshine in January is 7.8h.

UV index

January and November, with an average maximum UV index of 6, are months with the lowest UV index. 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: A typical high UV index of 6 in January suggests the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.