September weather forecastPematangsiantar, Indonesia
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Pematangsiantar, Indonesia, with an average temperature varying between 29.2°C (84.6°F) and 20.7°C (69.3°F).Temperature
In September, the average high-temperature registers at a warm 29.2°C (84.6°F), nearly identical to August's 30°C (86°F). Throughout September, Pematangsiantar anticipates an average low-temperature of 20.7°C (69.3°F).Heat index
September's average heat index is evaluated at a torrid 36°C (96.8°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', binds temperature metrics with humidity values to give a sense of the actual warmth. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. Under high air temperature coupled with high humidity (high heat index), the body's perspiration is reduced, intensifying the sensation of heat. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.
Humidity
In September, the average relative humidity in Pematangsiantar, Indonesia, is 83%.Rainfall
In Pematangsiantar, during September, the rain falls for 25.4 days and regularly aggregates up to 158mm (6.22") of precipitation. In Pematangsiantar, during the entire year, the rain falls for 317.9 days and collects up to 2279mm (89.72") of precipitation.Daylight
In Pematangsiantar, Indonesia, the average length of the day in September is 12h and 8min.On the first day of September, sunrise is at 06:18 and sunset at 18:28. On the last day of the month, sunrise is at 06:10 and sunset at 18:16 WIB.
Sunshine
In Pematangsiantar, the average sunshine in September is 8.1h.UV index
January through December, with an average maximum UV index of 6, are months with the highest UV index in Pematangsiantar, Indonesia. January through December, with an average maximum UV index of 6, are months with the lowest UV index in Pematangsiantar, Indonesia. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 6 suggests these recommendations:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Pematangsiantar, Indonesia
- Average high temperature in September: 29.2°C
The warmest month (with the highest average high temperature) is June (30.1°C).
The month with the lowest average high temperature is December (27.7°C).
- Average low temperature in September: 20.7°C
The month with the highest average low temperature is May (21.3°C).
The coldest month (with the lowest average low temperature) is January (20°C).
Average pressure in September
Pematangsiantar, Indonesia
- Average pressure in September: 1010.6mbar
The month with the highest atmospheric pressure is January (1010.8mbar).
The month with the lowest atmospheric pressure is May (1009.6mbar).
Average wind speed in September
Pematangsiantar, Indonesia
- Average wind speed in September: 4.3km/h
The windiest month (with the highest average wind speed) is February (4.8km/h).
The calmest month (with the lowest average wind speed) is November (4km/h).
Average humidity in September
Pematangsiantar, Indonesia
- Average humidity in September: 83%
The months with the highest relative humidity are January, November and December (87%).
The months with the lowest relative humidity are June, July and August (82%).
Average rainfall in September
Pematangsiantar, Indonesia
- Average rainfall in September: 158mm
The wettest month (with the highest rainfall) is April (237mm).
The driest month (with the least rainfall) is February (127mm).
Average rainfall days in September
Pematangsiantar, Indonesia
- Average rainfall days in September: 25.4 days
The month with the highest number of rainy days is December (29.3 days).
The month with the least rainy days is June (22.6 days).
Average daylight in September /
Average sunshine in September
Pematangsiantar, Indonesia
- Average daylight in September: 12h and 6min
The month with the longest days is June (Average daylight: 12h and 18min).
The month with the shortest days is December (Average daylight: 12h and 0min).
- Average sunshine in September: 8h and 6min
The months with the most sunshine are March and August (Average sunshine: 8h and 18min).
The months with the least sunshine are January and December (Average sunshine: 7h and 12min).
Average sunshine days in September
Pematangsiantar, Indonesia
- Average sunshine days in September: 3.7 days
The month with the most sunshine days is June (6.1 days).
The month with the least sunshine days is December (0.8 days).
Average UV index in September
Pematangsiantar, Indonesia
- Average UV index in September: 6
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 6).
Average cloud cover in September
Pematangsiantar, Indonesia
- Average cloud cover in September: 42
The month with the most cloud cover is December (Cloud cover 52).
The months with the least cloud cover are June, July and August (Cloud cover 39).
Average visibility in September
Pematangsiantar, Indonesia
- Average visibility in September: 8km
The months with the highest visibility are March, June, July, August, September, October and November (8km).
The months with the lowest visibility are January, February, April, May and December (7km).
