September weather forecast
Petaling Jaya, Malaysia

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Weather in September

As Petaling Jaya transitions to September, a slight dip in average monthly temperatures from 23.5°C (74.3°F) to 32.2°C (90°F) is observed. However, this doesn't disturb the uniformity of weather that the city has been experiencing over the past few months. Though the city's skyline often remains cloudy, ample daylight brightens up the surroundings. Typically, September keeps up with the consistency of the monsoon season. October forecasts an increase in rainfall, raising the total to 169mm (6.65").

Temperature

The commencement of September brings an average high-temperature of a still hot 32.2°C (90°F), marking an inconsequential divergence from August. Nighttime temperature dips to a mean of 23.5°C (74.3°F) during September.

Heat index

The average heat index in September is calculated to be a blistering 42°C (107.6°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', joins air temperature with relative humidity to produce a temperature perception for humans. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The months with the lowest humidity are August and September, with an average relative humidity of 73%.

Rainfall

In Petaling Jaya, in September, it is raining for 26.6 days, with typically 88mm (3.46") of accumulated precipitation. Throughout the year, there are 309.8 rainfall days, and 1481mm (58.31") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 8min.
On the first day of the month, sunrise is at 7:08 am and sunset at 7:18 pm. On the last day of September, sunrise is at 7:00 am and sunset at 7:06 pm +08.

Sunshine

The average sunshine in September is 8.7h.

UV index

The months with the highest UV index are February through October and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In September, an average UV index of 7 transforms into the following instructions:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.

Frequently asked questions

How hot is it in September?

In September, in Petaling Jaya, the average high-temperature is 32.2°C (90°F), and the average low-temperature is 23.5°C (74.3°F). The average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, in September is calculated to be 42°C (107.6°F).

What are the least humid months?

August and September, with an average relative humidity of 73%, are the least humid months.

What is the average humidity in September?

In Petaling Jaya, the average relative humidity in September is 73%.

How much does it rain in September?

In Petaling Jaya, in September, it is raining for 26.6 days, with typically 88mm (3.46") of accumulated precipitation.

What is the average length of the day in September?

The average day length in September is 12h and 8min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 7:08 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 7:06 pm +08.

How long on average sun shines in September?

The average sunshine duration in September is 8.7h.

What are the months with the highest UV index?

The months with the highest UV index in Petaling Jaya are February through October and December, with an average maximum UV index of 7.

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 exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Petaling Jaya, Malaysia

Average temperature in September - Petaling Jaya, Malaysia
  • Average high temperature in September: 32.2°C

The warmest months (with the highest average high temperature) are February, April, May and June (32.4°C).
The month with the lowest average high temperature is December (30.9°C).

  • Average low temperature in September: 23.5°C

The month with the highest average low temperature is May (24.4°C).
The coldest months (with the lowest average low temperature) are January and February (22.9°C).

Average pressure in September
Petaling Jaya, Malaysia

Average pressure in September - Petaling Jaya, Malaysia
  • Average pressure in September: 1009.7mbar

The month with the highest atmospheric pressure is January (1010.5mbar).
The month with the lowest atmospheric pressure is May (1008.7mbar).

Average wind speed in September
Petaling Jaya, Malaysia

Average wind speed in September - Petaling Jaya, Malaysia
  • Average wind speed in September: 5km/h

The windiest months (with the highest average wind speed) are July and August (5.2km/h).
The calmest months (with the lowest average wind speed) are November and December (4.2km/h).

Average humidity in September
Petaling Jaya, Malaysia

Average humidity in September - Petaling Jaya, Malaysia
  • Average humidity in September: 73%

The month with the highest relative humidity is December (82%).
The months with the lowest relative humidity are August and September (73%).

Average rainfall in September
Petaling Jaya, Malaysia

Average rainfall in September - Petaling Jaya, Malaysia
  • Average rainfall in September: 88mm

The wettest month (with the highest rainfall) is November (194mm).
The driest month (with the least rainfall) is February (68mm).

Average rainfall days in September
Petaling Jaya, Malaysia

Average rainfall days in September - Petaling Jaya, Malaysia
  • Average rainfall days in September: 26.6 days

The month with the highest number of rainy days is May (29.2 days).
The month with the least rainy days is February (19.4 days).

Average daylight in September /
Average sunshine in September
Petaling Jaya, Malaysia

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

The month with the longest days is June (Average daylight: 12h and 18min).
The month with the shortest days is December (Average daylight: 11h and 54min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is June (Average sunshine: 8h and 48min).
The months with the least sunshine are November and December (Average sunshine: 7h and 24min).

Average sunshine days in September
Petaling Jaya, Malaysia

Average sunshine days in September - Petaling Jaya, Malaysia
  • Average sunshine days in September: 1.6 days

The month with the most sunshine days is January (8.8 days).
The month with the least sunshine days is May (1.1 days).

Average UV index in September
Petaling Jaya, Malaysia

Average UV index in September - Petaling Jaya, Malaysia
  • Average UV index in September: 7

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

Average cloud cover in September
Petaling Jaya, Malaysia

Average cloud cover in September - Petaling Jaya, Malaysia
  • Average cloud cover in September: 38

The month with the most cloud cover is November (Cloud cover 51).
The months with the least cloud cover are June and July (Cloud cover 34).

Average visibility in September
Petaling Jaya, Malaysia

Average visibility in September - Petaling Jaya, Malaysia
  • Average visibility in September: 10km

The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, February, March, April, May, October, November and December (9km).

Petaling Jaya, Malaysia

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