September weather forecastWelikanda, Sri Lanka
September
Weather in September
The first month of the autumn, September, is also a hot month in Welikanda, Sri Lanka, with an average temperature ranging between min 24.1°C (75.4°F) and max 33.9°C (93°F).Temperature
The onset of September brings with it an average high-temperature of a still tropical 33.9°C (93°F), showing a negligible variation from the month before. Welikanda, in the month of September, anticipates a consistent average low-temperature of 24.1°C (75.4°F).Heat index
In September, the heat index is evaluated at a life-threatening hot 45°C (113°F). Remain alert: Heat exhaustion and heat cramps are predicted. Extended effort can lead to heatstroke.Heat index determinations are made taking into account the shade and light air movements. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a numerical representation of warmth when taking temperature and moisture levels into account. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.
Humidity
June through September, with an average relative humidity of 67%, are the least humid months.Rainfall
In Welikanda, in September, it is raining for 13.5 days, with typically 53mm (2.09") of accumulated precipitation. In Welikanda, during the entire year, the rain falls for 196.8 days and collects up to 943mm (37.13") of precipitation.Daylight
In September, the average length of the day is 12h and 10min.On the first day of the month, sunrise is at 05:56 and sunset at 18:12. On the last day of September, in Welikanda, sunrise is at 05:53 and sunset at 17:56 +0530.
Sunshine
In Welikanda, the average sunshine in September is 10.9h.UV index
The months with the highest UV index are February through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 7 during September leads to these instructions:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Welikanda, Sri Lanka
- Average high temperature in September: 33.9°C
The warmest month (with the highest average high temperature) is April (34.9°C).
The months with the lowest average high temperature are January and December (29.3°C).
- Average low temperature in September: 24.1°C
The month with the highest average low temperature is June (24.8°C).
The coldest months (with the lowest average low temperature) are January and February (20°C).
Average pressure in September
Welikanda, Sri Lanka
- Average pressure in September: 1008.8mbar
The month with the highest atmospheric pressure is January (1012mbar).
The month with the lowest atmospheric pressure is June (1007.5mbar).
Average wind speed in September
Welikanda, Sri Lanka
- Average wind speed in September: 18.7km/h
The windiest month (with the highest average wind speed) is June (23.8km/h).
The calmest month (with the lowest average wind speed) is April (7.1km/h).
Average humidity in September
Welikanda, Sri Lanka
- Average humidity in September: 67%
The month with the highest relative humidity is December (84%).
The months with the lowest relative humidity are June, July, August and September (67%).
Average rainfall in September
Welikanda, Sri Lanka
- Average rainfall in September: 53mm
The wettest month (with the highest rainfall) is October (214mm).
The driest month (with the least rainfall) is June (15mm).
Average rainfall days in September
Welikanda, Sri Lanka
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is November (24.1 days).
The month with the least rainy days is June (7.8 days).
Average daylight in September /
Average sunshine in September
Welikanda, Sri Lanka
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 12h and 36min).
The month with the shortest days is December (Average daylight: 11h and 42min).
- Average sunshine in September: 10h and 54min
The month with the most sunshine is June (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Welikanda, Sri Lanka
- Average sunshine days in September: 13.3 days
The month with the most sunshine days is July (16 days).
The month with the least sunshine days is November (4.2 days).
Average UV index in September
Welikanda, Sri Lanka
- Average UV index in September: 7
The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, November and December (UV index 6).
Average cloud cover in September
Welikanda, Sri Lanka
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is May (Cloud cover 26).
Average visibility in September
Welikanda, Sri Lanka
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January and December (7km).
