November weather forecast
Dehiwala, Sri Lanka

November in Dehiwala, Sri Lanka, brings about changes in the city's climatic conditions with a reduction in rainfall and moderate warmth. The transition from October to November brings about a considerable drop in precipitation yet maintains a consistently warm environment. Surprisingly, November registers a middle-of-the-road rainfall of 207mm (8.15"), a significant decrease from October's highs. As the end of November approaches, locals can look forward to December's lower rain levels and slightly cooler nights.

Temperature

The average high-temperature during November registers at a hot 30°C (86°F), closely corresponding to the preceding month. The temperature lowers to an average of 24.8°C (76.6°F) during November nights.

Heat index

Throughout November, the heat index is estimated at a torrid 37°C (98.6°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

In Dehiwala, Sri Lanka, the average relative humidity in November is 79%.

Rainfall

In Dehiwala, in November, it is raining for 25.9 days, with typically 207mm (8.15") of accumulated precipitation. In Dehiwala, during the entire year, the rain falls for 285.6 days and collects up to 2201mm (86.65") of precipitation.

Sea temperature

In Dehiwala, the average seawater temperature in November is 28.8°C (83.8°F).
Note: Swimming, diving, and other activities in water temperatures between 25°C (77°F) and 29°C (84.2°F) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.

Daylight

In Dehiwala, the average length of the day in November is 11h and 49min.
On the first day of the month, sunrise is at 05:57 and sunset at 17:50. On the last day of November, in Dehiwala, sunrise is at 06:06 and sunset at 17:52 +0530.

Sunshine

With an average of 6.6h of sunshine, November has the least sunshine of the year.

UV index

January through April, June, July, September, November and December, with an average maximum UV index of 7, are months with the highest UV index in Dehiwala. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In November, a regular UV index of 7 translates into these guidelines:
Deflect overexposure. Sun protection is a necessity. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Warning! The reflection of sand and water increases the UV dose.