September weather forecast
Horathuduwa, Sri Lanka

The first month of the autumn, September, is still a warm month in Horathuduwa, Sri Lanka, with an average temperature fluctuating between 25.2°C (77.4°F) and 28.8°C (83.8°F).

Temperature

Horathuduwa sees the arrival of September with an average high-temperature of a still warm 28.8°C (83.8°F), indicating a subtle variation from August. Horathuduwa's nights throughout September are marked by an average low temperature of 25.2°C (77.4°F), a minor drop from the day's high.

Heat index

September's heat index is computed to be a torrid 35°C (95°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', arises from combining readings of air temperature and relative moisture content. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. 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 largely significant for babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

The average relative humidity in September is 82%.

Rainfall

In September, in Horathuduwa, the rain falls for 26.3 days. Throughout September, 201mm (7.91") of precipitation is accumulated. In Horathuduwa, during the entire year, the rain falls for 273.8 days and collects up to 2059mm (81.06") of precipitation.

Daylight

In September, the average length of the day is 12h and 10min.
On the first day of the month, sunrise is at 06:02 and sunset at 18:17. On the last day of September, in Horathuduwa, sunrise is at 05:58 and sunset at 18:02 +0530.

Sunshine

In September, the average sunshine is 7.6h.

UV index

The months with the highest UV index are January through April, July, September through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: In September, the maximum UV index of 7 suggests this advice:
Inhibit overexposure. Warding off sun damage is of utmost importance. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.