September weather forecast
Mallavi, Sri Lanka

September, the first month of the autumn in Mallavi, is still a warm month, with an average temperature ranging between max 29.9°C (85.8°F) and min 27°C (80.6°F).

Temperature

Mallavi, Sri Lanka, starts September with an average high-temperature of a still warm 29.9°C (85.8°F), a minor shift from August's 29.8°C (85.6°F). Mallavi, during September nights, witnesses an average temperature marginally cooler than its daytime highs, at a still moderately hot 27°C (80.6°F).

Heat index

The heat index for September is estimated at a very hot 37°C (98.6°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

The average relative humidity in September in Mallavi is 77%.

Rainfall

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

Daylight

In Mallavi, Sri Lanka, the average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 06:00 and sunset at 18:17. On the last day of September, sunrise is at 05:57 and sunset at 18:00 +0530.

Sunshine

The average sunshine in September in Mallavi 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. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 in September interprets into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.