September weather forecast
Kaduwela, Sri Lanka

The tail end of the monsoon season appears in September in Kaduwela, with a sharp decline in rainfall from 287mm (11.3") in August to 206mm (8.11"). Despite the receding showers, the weather continues to be predominantly wet and cloudy. The slightly cooler days mark the onset of the post-monsoon season. As September progresses, the transformation in weather conditions accrues at a steady pace. This gives the month a unique edge by "ushering out" the monsoon season.

Temperature

September in Kaduwela, Sri Lanka, observes an average high-temperature of a still moderately hot 29.1°C (84.4°F), marking an insignificant difference from August's 28.9°C (84°F). Kaduwela observes a consistent average low-temperature of 24.9°C (76.8°F) throughout September nights.

Heat index

The heat index value during September is estimated at a sweltering 35°C (95°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

In September, the average relative humidity in Kaduwela is 81%.

Rainfall

In Kaduwela, in September, during 26.9 rainfall days, 206mm (8.11") of precipitation is typically accumulated. In Kaduwela, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Daylight

In Kaduwela, Sri Lanka, the average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 06:02 and sunset at 18:17. On the last day of September, sunrise is at 05:57 and sunset at 18:01 +0530.

Sunshine

In September, the average sunshine 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 health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 7 during September translates into the following guidance:
Fend off overexposure. Sun protection is vital. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.