September weather forecast
Rathkarawwa, Sri Lanka

The first month of the autumn, September, is also a hot month in Rathkarawwa, Sri Lanka, with an average temperature varying between 30.1°C (86.2°F) and 26°C (78.8°F).

Temperature

The introduction of September notes a subtle temperature variation to a still hot 30.1°C (86.2°F) from August's 30.4°C (86.7°F). Rathkarawwa experiences a minimal drop from daytime high temperatures, recording an average low-temperature of 26°C (78.8°F) throughout September.

Heat index

September's mean heat index is calculated to be a fiery hot 37°C (98.6°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
Data suggests that the heat index is set for environments in shade and with a light wind. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. 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 hold great significance to 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.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The average relative humidity in September is 75%.

Rainfall

In Rathkarawwa, during September, the rain falls for 14.4 days and regularly aggregates up to 48mm (1.89") of precipitation. In Rathkarawwa, Sri Lanka, during the entire year, the rain falls for 192.9 days and collects up to 942mm (37.09") of precipitation.

Daylight

In September, the average length of the day is 12h and 10min.
On the first day of September in Rathkarawwa, sunrise is at 05:58 and sunset at 18:13. On the last day of the month, sunrise is at 05:54 and sunset at 17:58 +0530.

Sunshine

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

UV index

January through September, November and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.