September weather forecast
Pamunuwa, Sri Lanka

The first month of the autumn, September, is still a warm month in Pamunuwa, Sri Lanka, with an average temperature ranging between min 24.9°C (76.8°F) and max 29.1°C (84.4°F).

Temperature

The advent of September reveals an average high-temperature of a still moderately hot 29.1°C (84.4°F), showing minimal difference from the prior month. In Pamunuwa, the nocturnal temperatures throughout September show a marginal dip from the daytime averages, settling at a still moderately hot 24.9°C (76.8°F).

Heat index

For most parts of September, the heat index is appraised at a very hot 35°C (95°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
In reference to the heat index, it's for places in shade and with a slight wind. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and 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 primarily vital for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

The average relative humidity in September in Pamunuwa, Sri Lanka, is 81%.

Rainfall

In Pamunuwa, during September, the rain falls for 26.9 days and regularly aggregates up to 206mm (8.11") of precipitation. In Pamunuwa, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Daylight

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

Sunshine

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

UV index

January through April, July, 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 exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 7 during September translates into these guidelines:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. 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. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.