September weather forecastMandai, Indonesia

September

Weather in September

September, the first month of the spring in Mandai, is still a hot month, with temperature in the range of an average low of 23.3°C (73.9°F) and an average high of 31.5°C (88.7°F).

Temperature

September's presence marks an average high-temperature of a still tropical 31.5°C (88.7°F), subtly varied from August's 30.6°C (87.1°F). Throughout the September nights, Mandai encounters a low-temperature of 23.3°C (73.9°F).

Heat index

The average heat index in September is computed to be a torrid 38°C (100.4°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The average relative humidity in September is 67%.

Rainfall

The month with the least rainfall is September, when the rain falls for 6.3 days and typically collects 10mm (0.39") of precipitation.

Daylight

The average length of the day in September is 12h and 5min.
On the first day of September, sunrise is at 06:01 and sunset at 18:02. On the last day of the month, sunrise is at 05:47 and sunset at 17:56 WITA.

Sunshine

In Mandai, the average sunshine in September is 10h.

UV index

The months with the highest UV index are February through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 7 during September translates into these guidelines:
Inhibit overexposure. Warding off sun damage is of utmost importance. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Updated: Jun 12, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In September, in Mandai, the average high-temperature is 31.5°C (88.7°F), and the average low-temperature is 23.3°C (73.9°F). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in September is computed to be 38°C (100.4°F).

The average relative humidity in September is 67%.

The month with the least rainfall is September, when the rain falls for 6.3 days and typically collects 10mm (0.39") of precipitation.

In Mandai, in September, it is raining for 6.3 days, with typically 10mm (0.39") of accumulated precipitation.

In Mandai, the average day length in September is 12h and 5min.

In September, on the first day of the month, sunrise is at 06:01 and sunset at 18:02. On the last day of the month, sunrise is at 05:47 and sunset at 17:56 WITA.

The average sunshine duration in September is 10h.

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

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

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

30.6°C

31.5°C

32.2°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

9.1km/h

8.9km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

25.1

23.5

20.5

Average UV index

Average cloud cover

16%

17%

Average visibility

10km

Average temperature in September
Mandai, Indonesia

Average high temperature in September: 31.5°C

The warmest month (with the highest average high temperature) is October (32.2°C).
The month with the lowest average high temperature is January (29.1°C).

Average low temperature in September: 23.3°C

The month with the highest average low temperature is November (25.5°C).
The coldest month (with the lowest average low temperature) is August (23°C).

Average pressure in September
Mandai, Indonesia

Average pressure in September: 1010.5mbar

The month with the highest atmospheric pressure is August (1010.8mbar).
The month with the lowest atmospheric pressure is December (1008.3mbar).

Average wind speed in September
Mandai, Indonesia

Average wind speed in September: 8.1km/h

The windiest month (with the highest average wind speed) is January (8.7km/h).
The calmest month (with the lowest average wind speed) is May (6.1km/h).

Average humidity in September
Mandai, Indonesia

Average humidity in September: 67%

The months with the highest relative humidity are April and May (79%).
The month with the lowest relative humidity is October (66%).

Average rainfall in September
Mandai, Indonesia

Average rainfall in September: 10mm

The wettest month (with the highest rainfall) is January (159mm).
The driest month (with the least rainfall) is September (10mm).

Average rainfall days in September
Mandai, Indonesia

Average rainfall days in September: 6.3 days

The month with the highest number of rainy days is March (23.8 days).
The month with the least rainy days is August (4.9 days).

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

Average daylight in September: 12h and 6min

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

Average sunshine in September: 10h and 0min

The month with the most sunshine is December (Average sunshine: 10h and 12min).
The month with the least sunshine is May (Average sunshine: 6h and 48min).

Average sunshine days in September
Mandai, Indonesia

Average sunshine days in September: 23.5 days

The month with the most sunshine days is August (25.1 days).
The month with the least sunshine days is March (4.1 days).

Average UV index in September
Mandai, Indonesia

Average UV index in September: 7

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

Average cloud cover in September
Mandai, Indonesia

Average cloud cover in September: 16

The month with the most cloud cover is January (Cloud cover 45).
The months with the least cloud cover are August and September (Cloud cover 16).

Average visibility in September
Mandai, 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).