September weather forecast
Rajagiriya, Sri Lanka

September, the first month of the autumn in Rajagiriya, is also a moderately hot month, with an average temperature varying between 24.9°C (76.8°F) and 29.1°C (84.4°F).

Temperature

Rajagiriya, Sri Lanka, records an average high-temperature of a still moderately hot 29.1°C (84.4°F) in September, maintaining a close correlation with August's 28.9°C (84°F). During the month of September, Rajagiriya identifies an average nighttime low-temperature of 24.9°C (76.8°F), slightly lower than its daytime counterpart.

Heat index

For September, the heat index is estimated at a sweltering 35°C (95°F). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. 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. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The average relative humidity in September in Rajagiriya is 81%.

Rainfall

In Rajagiriya, in September, it is raining for 26.9 days, with typically 206mm (8.11") of accumulated precipitation. Throughout the year, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Daylight

In Rajagiriya, the average length of the day in September 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, sunrise is at 05:58 and sunset at 18:02 +0530.

Sunshine

In September, the average sunshine in Rajagiriya is 7.4h.

UV index

The months with the highest UV index are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.