September weather forecast
Katuwawala, Sri Lanka

September, the first month of the autumn in Katuwawala, is also a moderately hot month, with an average temperature ranging between min 25.2°C (77.4°F) and max 28.9°C (84°F).

Temperature

The arrival of September denotes a barely perceptible change in the average high-temperatures to a still warm 28.9°C (84°F) from August's 28.6°C (83.5°F). With a barely noticeable fluctuation in temperature, Katuwawala reaches an average low of 25.2°C (77.4°F) during the September nights.

Heat index

The heat index value for September is computed to be a fiery hot 35°C (95°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In September, the average relative humidity in Katuwawala is 82%.

Rainfall

In September, the rain falls for 24.3 days. Throughout September, 189mm (7.44") of precipitation is accumulated. Throughout the year, there are 272.3 rainfall days, and 2039mm (80.28") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 10min.
On the first day of September in Katuwawala, 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 Katuwawala, the average sunshine in September is 7.5h.

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 health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index, 7 in September, converts into the following recommendations:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.