September weather forecastJepang, Indonesia

September

Weather in September

The first month of the spring, September, is still a tropical month in Jepang, Indonesia, with temperature in the range of an average low of 23.1°C (73.6°F) and an average high of 33.6°C (92.5°F).

Temperature

Jepang witnesses its highest average temperatures during September and October, peaking at 33.6°C (92.5°F).

Heat index

September's average heat index is estimated at a scorching 43°C (109.4°F). Stay vigilant: Heat cramps along with heat exhaustion are expected. Heatstroke may follow prolonged exertion.
The metrics for the heat index are tailored for both shady environments and light winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', arises from combining readings of air temperature and relative moisture content. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

With an average relative humidity of 65%, September is the least humid month in Jepang.

Rainfall

In Jepang, during September, the rain falls for 10.9 days and regularly aggregates up to 31mm (1.22") of precipitation. Throughout the year, there are 256 rainfall days, and 1649mm (64.92") of precipitation is accumulated.

Daylight

In Jepang, the average length of the day in September is 12h and 4min.
On the first day of September, sunrise is at 05:36 and sunset at 17:35. On the last day of the month, sunrise is at 05:21 and sunset at 17:31 WIB.

Sunshine

In Jepang, the average sunshine in September is 9.5h.

UV index

The months with the highest UV index are February through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: An average UV index of 7 in September transforms into this advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.

Updated: Jul 21, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Jepang's temperatures tend to hit their maximum during September and October, with an average high-temperature of 33.6°C (92.5°F).

The average high-temperature and low-temperature during September are 33.6°C (92.5°F) and 23.1°C (73.6°F) respectively. In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is estimated at 43°C (109.4°F).

With an average relative humidity of 65%, September is the least humid month.

In September, the average relative humidity is 65%.

In Jepang, in September, during 10.9 rainfall days, 31mm (1.22") of precipitation is typically accumulated.

In Jepang, the average day length in September is 12h and 4min.

In September, on the first day of the month, sunrise is at 05:36 and sunset at 17:35. On the last day of the month, sunrise is at 05:21 and sunset at 17:31 WIB.

In September, the average sunshine duration is 9.5h.

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

In Jepang, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

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

Aug

September

Oct

Average high temperature

32.3°C

33.6°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

9.7km/h

9.3km/h

9.5km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

18.3

16.5

11.1

Average UV index

Average cloud cover

28%

30%

Average visibility

10km

Average temperature in September
Jepang, Indonesia

Average high temperature in September: 33.6°C

The warmest months (with the highest average high temperature) are September and October (33.6°C).
The months with the lowest average high temperature are January and February (29.8°C).

Average low temperature in September: 23.1°C

The month with the highest average low temperature is November (24.6°C).
The coldest month (with the lowest average low temperature) is July (22.3°C).

Average pressure in September
Jepang, Indonesia

Average pressure in September: 1011.2mbar

The month with the highest atmospheric pressure is September (1011.2mbar).
The month with the lowest atmospheric pressure is December (1008.8mbar).

Average wind speed in September
Jepang, Indonesia

Average wind speed in September: 8.3km/h

The windiest months (with the highest average wind speed) are January and August (8.6km/h).
The calmest month (with the lowest average wind speed) is April (5.4km/h).

Average humidity in September
Jepang, Indonesia

Average humidity in September: 65%

The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is September (65%).

Average rainfall in September
Jepang, Indonesia

Average rainfall in September: 31mm

The wettest month (with the highest rainfall) is March (259mm).
The driest month (with the least rainfall) is August (24mm).

Average rainfall days in September
Jepang, Indonesia

Average rainfall days in September: 10.9 days

The month with the highest number of rainy days is January (29.9 days).
The month with the least rainy days is August (10.6 days).

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

Average daylight in September: 12h and 6min

The month with the longest days is December (Average daylight: 12h and 30min).
The month with the shortest days is June (Average daylight: 11h and 42min).

Average sunshine in September: 9h and 30min

The month with the most sunshine is August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 6h and 30min).

Average sunshine days in September
Jepang, Indonesia

Average sunshine days in September: 16.5 days

The month with the most sunshine days is August (18.3 days).
The month with the least sunshine days is January (0.3 days).

Average UV index in September
Jepang, 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
Jepang, Indonesia

Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are August and September (Cloud cover 28).

Average visibility in September
Jepang, Indonesia

Average visibility in September: 10km

The months with the highest visibility are August, September and October (10km).
The months with the lowest visibility are January, February, March, April and December (8km).