September weather forecast
Miriswatta, Sri Lanka

September, the first month of the autumn in Miriswatta, is also a moderately hot month, with an average temperature varying between 24.9°C (76.8°F) and 29.1°C (84.4°F).

Temperature

As September unfolds, the average high-temperature reaches a still moderately hot 29.1°C (84.4°F), hinting at a slight fluctuation from the previous month. Miriswatta's average temperature throughout the nights in September exhibits a minor decrease from daytime highs, stabilizing at a still warm 24.9°C (76.8°F).

Heat index

The heat index value during September is estimated at a torrid 35°C (95°F). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

In Miriswatta, Sri Lanka, the average relative humidity in September is 81%.

Rainfall

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

Daylight

In Miriswatta, 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, in Miriswatta, sunrise is at 05:57 and sunset at 18:01 +0530.

Sunshine

In September, the average sunshine in Miriswatta, Sri Lanka, is 7.4h.

UV index

The months with the highest UV index in Miriswatta are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.