September weather forecast
Welamboda, Sri Lanka

The first month of the autumn, September, is also a moderately hot month in Welamboda, Sri Lanka, with an average temperature fluctuating between 29.5°C (85.1°F) and 21.1°C (70°F).

Temperature

The arrival of September brings an average high-temperature of a still warm 29.5°C (85.1°F), nearly identical to August's 29.2°C (84.6°F). During the nights in September, Welamboda observes an average low-temperature of 21.1°C (70°F).

Heat index

The heat index in September is estimated at a sweltering 35°C (95°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
The heat index's values are generally associated with conditions in shade and light breezes. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

The average relative humidity in September is 77%.

Rainfall

In Welamboda, Sri Lanka, in September, it is raining for 23.4 days, with typically 118mm (4.65") of accumulated precipitation. In Welamboda, during the entire year, the rain falls for 278.4 days and collects up to 1466mm (57.72") of precipitation.

Daylight

The average length of the day in September in Welamboda is 12h and 10min.
On the first day of the month, sunrise is at 06:00 and sunset at 18:15. On the last day of September, sunrise is at 05:55 and sunset at 17:59 +0530.

Sunshine

In Welamboda, Sri Lanka, the average sunshine in September is 10.3h.

UV index

January through September, November and December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum UV index of 6 during September translates into these guidelines:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Experience reduced UV exposure by about half when donning a wide-brim hat.