October weather forecast
Dehiwala, Sri Lanka

October in Dehiwala sees the continuation of the rainfall pattern from September, albeit with a slight increase in both day and night temperatures. The contrast in the city's climate between September and October is subtle yet discernible with slightly warmer days. However, October also highlights a significant rainfall amounting to 245mm (9.65"), a considerable increase from the previous month. As the month comes to a close, Dehiwala prepares for continuous warmth and a subsequent decrease in rainfall in the forthcoming November.

Temperature

Dehiwala's weather in October indicates an average high-temperature of a still moderately hot 29.7°C (85.5°F), nearly consistent with the 29°C (84.2°F) of September. During the month of October, Dehiwala identifies an average nighttime low-temperature of 25.4°C (77.7°F), slightly lower than its daytime counterpart.

Heat index

The heat index value for October is estimated at a sweltering 37°C (98.6°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

The average relative humidity in October is 80%.

Rainfall

In Dehiwala, in October, during 26.7 rainfall days, 245mm (9.65") of precipitation is typically accumulated. Throughout the year, there are 285.6 rainfall days, and 2201mm (86.65") of precipitation is accumulated.

Sea temperature

In Dehiwala, the average seawater temperature in October is 28.6°C (83.5°F).
Note: Ideal surface water temperatures for any water activity fall between 25°C (77°F) and 29°C (84.2°F), offering maximum enjoyment for lengthened periods.

Daylight

In October, the average length of the day in Dehiwala is 11h and 58min.
On the first day of the month, sunrise is at 05:58 and sunset at 18:01. On the last day of October, in Dehiwala, sunrise is at 05:57 and sunset at 17:50 +0530.

Sunshine

In October, the average sunshine is 7.8h.

UV index

The months with the lowest UV index in Dehiwala are May, August and October, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: During October, 6 as the daily maximum UV index converts into the following advice:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be on guard! The reflective nature of sand and water boosts UV exposure.