September weather forecast
Irakkamam, Sri Lanka

September, the first month of the autumn in Irakkamam, is still a tropical month, with an average temperature fluctuating between 25.7°C (78.3°F) and 31.8°C (89.2°F).

Temperature

September's commencement is accompanied by an average high-temperature of a still tropical 31.8°C (89.2°F), diverging marginally from August's 32.3°C (90.1°F). In the month of September, Irakkamam witnesses a consistent average low-temperature of 25.7°C (78.3°F).

Heat index

September's mean heat index is appraised at a blistering 41°C (105.8°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Keep in mind the heat index values are meant for areas in shade and with light wind. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

In Irakkamam, Sri Lanka, the average relative humidity in September is 72%.

Rainfall

In September, the rain falls for 22 days. Throughout September, 81mm (3.19") of precipitation is accumulated. Throughout the year, there are 237.8 rainfall days, and 1259mm (49.57") of precipitation is accumulated.

Daylight

In September, the average length of the day in Irakkamam is 12h and 10min.
On the first day of September, sunrise is at 05:55 and sunset at 18:10. On the last day of the month, sunrise is at 05:51 and sunset at 17:54 +0530.

Sunshine

In Irakkamam, the average sunshine in September is 10.7h.

UV index

The months with the highest UV index are January through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 7 during September translates into the following guidance:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.