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

Petaling Jaya records an average high-temperature of a still hot 31.2°C (88.2°F) as January arrives, nearly mirroring the previous month's climate. During January, Petaling Jaya consistently records a temperature low averaging an agreeable 22.9°C (73.2°F).

Heat index

The heat index in January is estimated at an extremely hot 42°C (107.6°F). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

The average relative humidity in January in Petaling Jaya, Malaysia, is 80%.

Rainfall

In Petaling Jaya, Malaysia, in January, it is raining for 21.3 days, with typically 85mm (3.35") of accumulated precipitation. Throughout the year, there are 309.8 rainfall days, and 1481mm (58.31") of precipitation is accumulated.

Daylight

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 value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In January, the UV index of 6 transforms into the following advice:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.