September weather forecast
Hiyarapitiya, Sri Lanka

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

Temperature

The beginning of September records an average high-temperature of a still moderately hot 29.4°C (84.9°F), almost echoing the conditions of the previous month. In Hiyarapitiya, the expected average low-temperature for September is a pleasant 21°C (69.8°F).

Heat index

September's heat index is estimated at a torrid 35°C (95°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. 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. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

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

Rainfall

In Hiyarapitiya, during September, the rain falls for 23.9 days and regularly aggregates up to 129mm (5.08") of precipitation. Throughout the year, in Hiyarapitiya, there are 278.9 rainfall days, and 1477mm (58.15") of precipitation is accumulated.

Daylight

In September, the average length of the day in Hiyarapitiya is 12h and 10min.
On the first day of the month, sunrise is at 06:00 and sunset at 18:15. On the last day of September, sunrise is at 05:55 and sunset at 17:59 +0530.

Sunshine

In Hiyarapitiya, Sri Lanka, the average sunshine in September is 9.9h.

UV index

The months with the highest UV index in Hiyarapitiya are January through September, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In September, an average UV index of 6 transforms into the following instructions:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.