September weather forecast
Santhiveli, Sri Lanka

The first month of the autumn, September, is still a hot month in Santhiveli, Sri Lanka, with an average temperature ranging between min 25.7°C (78.3°F) and max 31.8°C (89.2°F).

Temperature

September's arrival brings an average high-temperature of a still tropical 31.8°C (89.2°F), demonstrating subtle variation from the preceding month. Throughout September, a steady low-temperature average of 25.7°C (78.3°F) is noted.

Heat index

The heat index value for September is estimated at a blistering 41°C (105.8°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', reflects the feeling of heat when considering both air temperature and humidity. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

In Santhiveli, the average relative humidity in September is 72%.

Rainfall

In September, in Santhiveli, the rain falls for 22 days. Throughout September, 81mm (3.19") of precipitation is accumulated. In Santhiveli, during the entire year, the rain falls for 237.8 days and collects up to 1259mm (49.57") of precipitation.

Daylight

The average length of the day in September is 12h and 10min.
On the first day of September, sunrise is at 05:55 and sunset at 18:11. On the last day of the month, sunrise is at 05:51 and sunset at 17:55 +0530.

Sunshine

In September, the average sunshine is 10.7h.

UV index

The months with the highest UV index in Santhiveli are January through October, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, a regular UV index of 7 translates into these guidelines:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.