September weather forecast
Tanduvan, Sri Lanka

The first month of the autumn, September, is also a moderately hot month in Tanduvan, Sri Lanka, with an average temperature ranging between min 27°C (80.6°F) and max 29.9°C (85.8°F).

Temperature

Tanduvan's shift into September is marked by a subtle change to a still warm 29.9°C (85.8°F) from August's 29.8°C (85.6°F) in temperature. Tanduvan's temperature during September nights registers a minor decrease to an average low of 27°C (80.6°F).

Heat index

The heat index value during September is calculated to be a sweltering 37°C (98.6°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', quantifies the warmth felt when relative humidity is considered. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

In Tanduvan, the average relative humidity in September is 77%.

Rainfall

In Tanduvan, during September, the rain falls for 15.5 days and regularly aggregates up to 45mm (1.77") of precipitation. In Tanduvan, during the entire year, the rain falls for 181.2 days and collects up to 849mm (33.43") of precipitation.

Daylight

The average length of the day in September in Tanduvan is 12h and 10min.
On the first day of September in Tanduvan, Sri Lanka, sunrise is at 05:58 and sunset at 18:15. On the last day of the month, sunrise is at 05:55 and sunset at 17:58 +0530.

Sunshine

In September, the average sunshine is 9.7h.

UV index

January through October and December, with an average maximum UV index of 7, are months with the highest UV index in Tanduvan. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 7 translates into these guidelines:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.