September weather forecast
Bukit Mertajam, Malaysia

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Weather in September

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 registers an average high-temperature of a still hot 31.5°C (88.7°F), slightly varied from August's 32.2°C (90°F). Bukit Mertajam cools down to an average low-temperature of 23.5°C (74.3°F) throughout the month of September.

Heat index

The heat index value for September is evaluated at an extremely hot 42°C (107.6°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', melds the effects of warmth and moisture to generate a feeling of heat. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

In September, the average relative humidity is 78%.

Rainfall

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

Sea temperature

In Bukit Mertajam, Malaysia, 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 regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The average length of the day in September is 12h and 9min.
On the first day of September, sunrise is at 7:11 am and sunset at 7:24 pm. On the last day of the month, 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

The months with the highest UV index are January through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: The daily high UV index of 7 during September translates into the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Attention! UV radiation is markedly stronger with water and sand reflections.

Frequently asked questions

Is it hot during September?

The average high-temperature and low-temperature in Bukit Mertajam during September are 31.5°C (88.7°F) and 23.5°C (74.3°F) respectively. In September, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 42°C (107.6°F).

What is the average humidity in September?

In September, the average relative humidity is 78%.

How much does it rain in Bukit Mertajam in September?

In Bukit Mertajam, in September, it is raining for 25.6 days, with typically 105mm (4.13") of accumulated precipitation.

What is the water temperature in September?

In Bukit Mertajam, the average seawater temperature in September is 29.5°C (85.1°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Bukit Mertajam have in September?

In Bukit Mertajam, the average day length in September is 12h and 9min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 7:11 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 7:10 pm +08.

How long on average sun shines in September?

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

When is the highest UV index?

January through October, with an average maximum UV index of 7, are months with the highest UV index.

How high is the UV index in September?

The average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to UV radiation.

Average temperature in September
Bukit Mertajam, Malaysia

Average temperature in September - Bukit Mertajam, Malaysia
  • Average high temperature in September: 31.5°C

The warmest month (with the highest average high temperature) is February (32.7°C).
The month with the lowest average high temperature is December (30.6°C).

  • Average low temperature in September: 23.5°C

The months with the highest average low temperature are April and May (24.8°C).
The coldest month (with the lowest average low temperature) is January (22.9°C).

Average pressure in September
Bukit Mertajam, Malaysia

Average pressure in September - Bukit Mertajam, Malaysia
  • Average pressure in September: 1009.9mbar

The month with the highest atmospheric pressure is January (1010.6mbar).
The months with the lowest atmospheric pressure are May and June (1008.9mbar).

Average wind speed in September
Bukit Mertajam, Malaysia

Average wind speed in September - Bukit Mertajam, Malaysia
  • Average wind speed in September: 5.2km/h

The windiest month (with the highest average wind speed) is January (5.7km/h).
The calmest month (with the lowest average wind speed) is November (4.8km/h).

Average humidity in September
Bukit Mertajam, Malaysia

Average humidity in September - Bukit Mertajam, Malaysia
  • Average humidity in September: 78%

The months with the highest relative humidity are November and December (83%).
The months with the lowest relative humidity are February, June, July and August (77%).

Average rainfall in September
Bukit Mertajam, Malaysia

Average rainfall in September - Bukit Mertajam, Malaysia
  • Average rainfall in September: 105mm

The wettest month (with the highest rainfall) is November (169mm).
The driest month (with the least rainfall) is February (64mm).

Average rainfall days in September
Bukit Mertajam, Malaysia

Average rainfall days in September - Bukit Mertajam, Malaysia
  • Average rainfall days in September: 25.6 days

The month with the highest number of rainy days is November (28.2 days).
The month with the least rainy days is February (18.2 days).

Average sea temperature in September
Bukit Mertajam, Malaysia

Average sea temperature in September - Bukit Mertajam, Malaysia
  • Average sea temperature in September: 29.5°C

The best month for swimming (with the highest average sea temperature) is May (30.5°C).
The coldest month (with the lowest average sea temperature) is January (28.7°C).

Average daylight in September /
Average sunshine in September
Bukit Mertajam, Malaysia

Average daylight in September / Average sunshine in September - Bukit Mertajam, Malaysia
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 24min).
The month with the shortest days is December (Average daylight: 11h and 48min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is February (Average sunshine: 9h and 6min).
The month with the least sunshine is November (Average sunshine: 7h and 24min).

Average sunshine days in September
Bukit Mertajam, Malaysia

Average sunshine days in September - Bukit Mertajam, Malaysia
  • Average sunshine days in September: 1.9 days

The month with the most sunshine days is February (7.8 days).
The month with the least sunshine days is November (1 days).

Average UV index in September
Bukit Mertajam, Malaysia

Average UV index in September - Bukit Mertajam, Malaysia
  • Average UV index in September: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are November and December (UV index 6).

Average cloud cover in September
Bukit Mertajam, Malaysia

Average cloud cover in September - Bukit Mertajam, Malaysia
  • Average cloud cover in September: 41

The month with the most cloud cover is November (Cloud cover 49).
The month with the least cloud cover is February (Cloud cover 31).

Average visibility in September
Bukit Mertajam, Malaysia

Average visibility in September - Bukit Mertajam, Malaysia
  • Average visibility in September: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, September and October (9km).
The months with the lowest visibility are November and December (8km).

Bukit Mertajam, Malaysia

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