September weather forecastIlavalai, Sri Lanka
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Ilavalai, Sri Lanka, with an average temperature varying between 27.6°C (81.7°F) and 28.8°C (83.8°F).Temperature
With the advent of September, Ilavalai experiences an average high-temperature of a still warm 28.8°C (83.8°F), mirroring a close resemblance to the previous month. September nights in Ilavalai register a minor temperature decline, steadying at a still moderately hot 27.6°C (81.7°F).Heat index
In September, the average heat index is appraised at a tropical 34°C (93.2°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', evaluates the perceived heat by adding the effect of moisture in the air. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Humidity
The months with the highest humidity are May and September, with an average relative humidity of 79%.Rainfall
In Ilavalai, in September, during 21.7 rainfall days, 90mm (3.54") of precipitation is typically accumulated. In Ilavalai, Sri Lanka, during the entire year, the rain falls for 189.6 days and collects up to 1106mm (43.54") of precipitation.Daylight
In September, the average length of the day is 12h and 11min.On the first day of September, sunrise is at 06:00 and sunset at 18:19. On the last day of the month, sunrise is at 05:58 and sunset at 18:01 +0530.
Sunshine
In Ilavalai, the average sunshine in September is 10.4h.UV index
January through September and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.Note: In September, an average UV index of 7 transforms into the following instructions:
Inhibit overexposure. Warding off sun damage is of utmost importance. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Ilavalai, Sri Lanka
- Average high temperature in September: 28.8°C
The warmest month (with the highest average high temperature) is May (30.7°C).
The month with the lowest average high temperature is January (26.8°C).
- Average low temperature in September: 27.6°C
The month with the highest average low temperature is May (29°C).
The coldest month (with the lowest average low temperature) is January (25.5°C).
Average pressure in September
Ilavalai, Sri Lanka
- Average pressure in September: 1007.6mbar
The month with the highest atmospheric pressure is January (1012.5mbar).
The month with the lowest atmospheric pressure is June (1005.8mbar).
Average wind speed in September
Ilavalai, Sri Lanka
- Average wind speed in September: 27.2km/h
The windiest month (with the highest average wind speed) is June (32.9km/h).
The calmest month (with the lowest average wind speed) is April (16.3km/h).
Average humidity in September
Ilavalai, Sri Lanka
- Average humidity in September: 79%
The months with the highest relative humidity are May and September (79%).
The month with the lowest relative humidity is March (75%).
Average rainfall in September
Ilavalai, Sri Lanka
- Average rainfall in September: 90mm
The wettest months (with the highest rainfall) are October and November (257mm).
The driest month (with the least rainfall) is March (18mm).
Average rainfall days in September
Ilavalai, Sri Lanka
- Average rainfall days in September: 21.7 days
The month with the highest number of rainy days is October (25.1 days).
The months with the least rainy days are February and March (7.6 days).
Average daylight in September /
Average sunshine in September
Ilavalai, Sri Lanka
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 36min).
- Average sunshine in September: 10h and 24min
The months with the most sunshine are May and June (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Ilavalai, Sri Lanka
- Average sunshine days in September: 6.6 days
The month with the most sunshine days is March (21.2 days).
The month with the least sunshine days is November (3.8 days).
Average UV index in September
Ilavalai, Sri Lanka
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, May, June, July, August, September and December (UV index 7).
The months with the lowest UV index are October and November (UV index 6).
Average cloud cover in September
Ilavalai, Sri Lanka
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 47).
The month with the least cloud cover is March (Cloud cover 16).
Average visibility in September
Ilavalai, Sri Lanka
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September and December (10km).
The months with the lowest visibility are October and November (9km).
