September weather forecast
Bukit Mertajam, Malaysia

As September rolls in, Bukit Mertajam perseveres under the high temperatures and continues to experience a shower-prone climate with rainfall registering 105mm (4.13"). The city spends most of its time under cloud cover, hinting towards the impending monsoon season. Despite this, warm temperatures persist, ensuring the tropical climate remains intact. The weather gradually turns cooler closer to the month's end, setting the tone for the upcoming months. Sea temperatures, despite being consistently high, start to show a marginal dip.

Temperature

September's arrival in Bukit Mertajam brings an average high-temperature of a still hot 31.5°C (88.7°F), slightly deviating from August's 32.2°C (90°F). September brings Bukit Mertajam a consistent average low-temperature of 23.5°C (74.3°F).

Heat index

September's mean heat index is estimated at a scorching 42°C (107.6°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Given the heat index, its values are aligned with shaded sites and gentle winds. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

In Bukit Mertajam, the average relative humidity in September is 78%.

Rainfall

In Bukit Mertajam, during September, the rain falls for 25.6 days and regularly aggregates up to 105mm (4.13") of precipitation. Throughout the year, there are 294.8 rainfall days, and 1325mm (52.17") of precipitation is accumulated.

Sea temperature

In Bukit Mertajam, in September, the average water temperature is 29.5°C (85.1°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is perceived as agreeably warm, making all water activities enjoyable without the risk of discomfort over lengthy durations.

Daylight

In Bukit Mertajam, the average length of the day in September is 12h and 9min.
On the first day of the month, sunrise is at 7:11 am and sunset at 7:24 pm. On the last day of September, sunrise is at 7:05 am and sunset at 7:10 pm +08.

Sunshine

In Bukit Mertajam, the average sunshine in September is 8.5h.

UV index

January through October, 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 risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Caution! The Sun's UV rays become stronger due to reflections from water and sand.