September weather forecast
Penideniya, Sri Lanka

The first month of the autumn, September, is also a moderately hot month in Penideniya, Sri Lanka, with an average temperature ranging between max 29.4°C (84.9°F) and min 21°C (69.8°F).

Temperature

The transition into September reveals an average high-temperature of a still moderately hot 29.4°C (84.9°F), mirroring a close resemblance to August. In Penideniya, an average nighttime temperature of 21°C (69.8°F) is expected during September.

Heat index

The heat index value for September is computed to be a fiery hot 35°C (95°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Remember that heat index calculations are made for conditions in the shade with light wind. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

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

Rainfall

In Penideniya, in September, it is raining for 23.9 days, with typically 129mm (5.08") of accumulated precipitation. Throughout the year, in Penideniya, there are 278.9 rainfall days, and 1477mm (58.15") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 10min.
On the first day of the month, sunrise is at 05:59 and sunset at 18:15. On the last day of September, sunrise is at 05:55 and sunset at 17:59 +0530.

Sunshine

In September, the average sunshine in Penideniya is 9.9h.

UV index

The months with the highest UV index in Penideniya are January through September, November and December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: In September, a daily maximum UV index of 6 leads to the following instructions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.