September weather forecast
Moratuwa, Sri Lanka

As September rolls around in Moratuwa, the city experiences a transitional phase from monsoon to post-monsoon. The humidity levels and sea temperatures marginally decrease and return to their pre-monsoon levels. Regardless of the receding monsoon, the city continues to experience ample daylight and sustained visibility. September stands out as the city's rainfall starts to decrease, recording 201mm (7.91"). The wind speeds simmer down in comparison to the monsoonal gusts, making the weather more comfortable.

Temperature

September observes an average high-temperature of a still moderately hot 28.8°C (83.8°F), marking an insignificant difference from August's 28.6°C (83.5°F). Moratuwa nights in September witness a mild cool down to an average temperature of 25.2°C (77.4°F).

Heat index

September's average heat index is appraised at a very hot 35°C (95°F). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', takes into account both air temperature and humidity to illustrate what people actually feel. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

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

Rainfall

In September, in Moratuwa, the rain falls for 26.3 days. Throughout September, 201mm (7.91") of precipitation is accumulated. In Moratuwa, during the entire year, the rain falls for 273.8 days and collects up to 2059mm (81.06") of precipitation.

Sea temperature

In Moratuwa, the average seawater temperature in September is 27.8°C (82°F).
Note: Swimming, diving, and similar water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as very agreeable and pleasurable for lengthy periods without discomfort.

Daylight

The average length of the day in September is 12h and 10min.
On the first day of September, sunrise is at 06:03 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 is 7.6h.

UV index

The months with the highest UV index in Moratuwa are January through April, July, September through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: During September, 7 as the daily maximum UV index converts into the following advice:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Caution! The mirror effect of sand and water ups the UV radiation strength.