September weather forecast
Batam, Indonesia

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Weather in September

The weather in September in Batam navigates a significant turn, bringing about the driest conditions of the entire year. With mild temperature fluctuation and unchanged humidity, Batam continues to maintain its warm, tropical climate. A substantial decrease lowers the rainfall promptly to 58mm (2.28"), positioning September as a noticeably dry month. With this reduced rainfall, the city enjoys enhanced luminosity courtesy of longer sunshine hours. However, the start of October initiates an increase in rainfall consistent with Batam's return to typical high rainfall levels.

Temperature

The transition into September shows a subtle variation to a still tropical 30.4°C (86.7°F) from August's 30.2°C (86.4°F) in the average high-temperature. In September, a low-temperature average of 26.5°C (79.7°F) is characteristic of Batam, marking a minor shift from daytime temperatures.

Heat index

In September, the average heat index is computed to be a torrid 37°C (98.6°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In September, the average relative humidity is 73%.

Rainfall

September is the month with the least rainfall. Rain falls for 20 days and accumulates 58mm (2.28") of precipitation.

Daylight

The average length of the day in September is 12h and 7min.
On the first day of September, sunrise is at 05:59 and sunset at 18:07. On the last day of the month, sunrise is at 05:50 and sunset at 17:56 WIB.

Sunshine

In Batam, the average sunshine in September is 10.2h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.

Frequently asked questions

How hot is September?

In September, in Batam, the average high-temperature is 30.4°C (86.7°F), and the average low-temperature is 26.5°C (79.7°F). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is computed to be 37°C (98.6°F).

What is the average humidity in September?

In September, the average relative humidity is 73%.

What is the driest month?

September is the month with the least rainfall in Batam. Rain falls for 20 days and accumulates 58mm (2.28") of precipitation.

How much does it rain in September?

In Batam, in September, it is raining for 20 days, with typically 58mm (2.28") of accumulated precipitation.

How many hours of daylight does Batam have in September?

In Batam, Indonesia, the average day length in September is 12h and 7min.

When is the sunrise / sunset in September in Batam?

In September, on the first day of the month, sunrise is at 05:59 and sunset at 18:07. On the last day of the month, in Batam, sunrise is at 05:50 and sunset at 17:56 WIB.

How long on average sun shines in September?

In September, the average sunshine duration is 10.2h.

When is the highest UV index?

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

What are the months with the lowest UV index?

The months with the lowest UV index are January through December, with an average maximum UV index of 7.

How high is the UV index in September?

In September, the average daily maximum UV index is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in September
Batam, Indonesia

Average temperature in September - Batam, Indonesia
  • Average high temperature in September: 30.4°C

The warmest month (with the highest average high temperature) is May (31.2°C).
The month with the lowest average high temperature is January (29.3°C).

  • Average low temperature in September: 26.5°C

The month with the highest average low temperature is May (27.3°C).
The coldest months (with the lowest average low temperature) are January and February (25.7°C).

Average pressure in September
Batam, Indonesia

Average pressure in September - Batam, Indonesia
  • Average pressure in September: 1009.6mbar

The month with the highest atmospheric pressure is February (1010.2mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).

Average wind speed in September
Batam, Indonesia

Average wind speed in September - Batam, Indonesia
  • Average wind speed in September: 10.6km/h

The windiest month (with the highest average wind speed) is January (14.9km/h).
The calmest month (with the lowest average wind speed) is May (8km/h).

Average humidity in September
Batam, Indonesia

Average humidity in September - Batam, Indonesia
  • Average humidity in September: 73%

The months with the highest relative humidity are January and December (79%).
The month with the lowest relative humidity is October (72%).

Average rainfall in September
Batam, Indonesia

Average rainfall in September - Batam, Indonesia
  • Average rainfall in September: 58mm

The wettest month (with the highest rainfall) is December (220mm).
The driest month (with the least rainfall) is September (58mm).

Average rainfall days in September
Batam, Indonesia

Average rainfall days in September - Batam, Indonesia
  • Average rainfall days in September: 20 days

The month with the highest number of rainy days is December (26.4 days).
The month with the least rainy days is February (16.3 days).

Average daylight in September /
Average sunshine in September
Batam, Indonesia

Average daylight in September / Average sunshine in September - Batam, Indonesia
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 12min).
The month with the shortest days is December (Average daylight: 12h and 6min).

  • Average sunshine in September: 10h and 1min

The month with the most sunshine is May (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 7h and 30min).

Average sunshine days in September
Batam, Indonesia

Average sunshine days in September - Batam, Indonesia
  • Average sunshine days in September: 8.5 days

The month with the most sunshine days is February (9.7 days).
The month with the least sunshine days is November (4.1 days).

Average UV index in September
Batam, Indonesia

Average UV index in September - Batam, Indonesia
  • Average UV index in September: 7

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

Average cloud cover in September
Batam, Indonesia

Average cloud cover in September - Batam, Indonesia
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 50).
The month with the least cloud cover is September (Cloud cover 31).

Average visibility in September
Batam, Indonesia

Average visibility in September - Batam, Indonesia
  • Average visibility in September: 10km

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

Batam, Indonesia

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