Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Sleman greets September with an average high-temperature of a still warm 28.7°C (83.7°F), marking a slight deviation from the preceding month. The temperature dips to an average of 21.4°C (70.5°F) during September nights.Heat index
The heat index in September is estimated at a tropical 34°C (93.2°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 experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
Humidity
September and October, with an average relative humidity of 80%, are the least humid months.Rainfall
In Sleman, in September, it is raining for 17.8 days, with typically 52mm (2.05") of accumulated precipitation. In Sleman, during the entire year, the rain falls for 294.6 days and collects up to 1749mm (68.86") of precipitation.Daylight
In September, the average length of the day is 12h and 4min.On the first day of September, sunrise is at 05:39 and sunset at 17:37. On the last day of the month, sunrise is at 05:23 and sunset at 17:33 WIB.
Sunshine
In September, the average sunshine is 8.6h.UV index
The months with the lowest UV index are January, April through September, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In September, a daily UV index of 6 turns into the following recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What are the least humid months in Sleman?
What is the average humidity in September?
How many days does it rain in September?
How many hours of daylight does Sleman have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Sleman have in September?
When is the lowest UV index?
What is the UV index intensity in September?
Average temperature in September
Sleman, Indonesia
- Average high temperature in September: 28.7°C
The warmest month (with the highest average high temperature) is October (29.3°C).
The month with the lowest average high temperature is July (27.7°C).
- Average low temperature in September: 21.4°C
The months with the highest average low temperature are January and November (23.3°C).
The coldest month (with the lowest average low temperature) is August (21°C).
Average pressure in September
Sleman, Indonesia
- Average pressure in September: 1011.8mbar
The months with the highest atmospheric pressure are August and September (1011.8mbar).
The month with the lowest atmospheric pressure is December (1009mbar).
Average wind speed in September
Sleman, Indonesia
- Average wind speed in September: 11km/h
The windiest month (with the highest average wind speed) is August (11.6km/h).
The calmest month (with the lowest average wind speed) is April (7km/h).
Average humidity in September
Sleman, Indonesia
- Average humidity in September: 80%
The months with the highest relative humidity are May and June (84%).
The months with the lowest relative humidity are September and October (80%).
Average rainfall in September
Sleman, Indonesia
- Average rainfall in September: 52mm
The wettest month (with the highest rainfall) is March (236mm).
The driest month (with the least rainfall) is August (29mm).
Average rainfall days in September
Sleman, Indonesia
- Average rainfall days in September: 17.8 days
The month with the highest number of rainy days is January (30.3 days).
The month with the least rainy days is August (13.8 days).
Average daylight in September /
Average sunshine in September
Sleman, Indonesia
- Average daylight in September: 12h and 1min
The month with the longest days is December (Average daylight: 12h and 36min).
The month with the shortest days is June (Average daylight: 11h and 42min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is February (Average sunshine: 9h and 0min).
The month with the least sunshine is December (Average sunshine: 7h and 24min).
Average sunshine days in September
Sleman, Indonesia
- Average sunshine days in September: 7.3 days
The month with the most sunshine days is August (11.1 days).
The months with the least sunshine days are January and February (0.4 days).
Average UV index in September
Sleman, Indonesia
- Average UV index in September: 6
The months with the highest UV index are February, March and October (UV index 7).
The months with the lowest UV index are January, April, May, June, July, August, September, November and December (UV index 6).
Average cloud cover in September
Sleman, Indonesia
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July and August (Cloud cover 38).
Average visibility in September
Sleman, Indonesia
- 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).
Sleman, Indonesia
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