July weather forecast
Dumai, Indonesia

July, like June, is another hot summer month in Dumai, Indonesia, with an average temperature fluctuating between 24.3°C (75.7°F) and 32.5°C (90.5°F).

Temperature

The average high-temperature is a still hot 32.5°C (90.5°F) in July, hardly different from the 32.8°C (91°F) recorded in June. In Dumai, the average temperature during the nights of July drops to a warm 24.3°C (75.7°F).

Heat index

The heat index value for July is appraised at a burning hot 46°C (114.8°F). Alert: Heat cramps and heat exhaustion are likely to occur. Prolonged exertion can lead to heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly critical for babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When relative humidity is heightened, it slows the rate of evaporation, thereby decreasing the body's ability to shed heat and creating a sensation of overheating. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

In Dumai, Indonesia, the average relative humidity in July is 79%.

Rainfall

In Dumai, in July, during 22.7 rainfall days, 81mm (3.19") of precipitation is typically accumulated. Throughout the year, there are 286.4 rainfall days, and 1200mm (47.24") of precipitation is accumulated.

Sea temperature

In July, the average sea temperature in Dumai is 29.9°C (85.8°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as ideal and highly pleasant for extended enjoyment in all water activities.

Daylight

The average length of the day in July is 12h and 13min.
On the first day of the month, sunrise is at 06:11 and sunset at 18:24. On the last day of July, sunrise is at 06:15 and sunset at 18:26 WIB.

Sunshine

In Dumai, the average sunshine in July is 8.4h.

UV index

The months with the highest UV index in Dumai, Indonesia, are January through September and November, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 7 during July translates into the following recommendations:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Attention! UV radiation is markedly stronger with water and sand reflections.