October weather forecast and climate
Mumbai, India

October, the first month of the post monsoon autumn, in Mumbai, is still a tropical month, with average temperature ranging between min 23.4°C (74.1°F) and max 33.2°C (91.8°F).
The perfect water temperature of 28.8°C (83.8°F) with 55.8mm (2.2") of accumulated rainfall and only 3 rainfall days, makes October a great period for swimming and other water activities.

Temperature

In October, the average high-temperature is almost the same as in September - a still tropical 33.2°C (91.8°F). The average low-temperature, in Mumbai, is 23.4°C (74.1°F).

Heat index

The average heat index in October is calculated to a burning hot 47.9°C (118.2°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like differences in body mass, height, and shape, wind, metabolic differences, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In October, the average relative humidity is 78%.

Rainfall

In Mumbai, India, during October, the rain falls for 3 days and regularly aggregates up to 55.8mm (2.2") of precipitation. Throughout the year, in Mumbai, there are 78.9 rainfall days, and 2258mm (88.9") of precipitation is accumulated.

Sea temperature

In October, the average sea temperature in Mumbai is 28.8°C (83.8°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In October, the average length of the day in Mumbai, India, is 11.7h.

Sunshine

In Mumbai, the average sunshine is 7.7h.

UV index

In Mumbai, the average daily maximum UV index in October is 10. A UV Index reading of 8 to 10 represents a very high health risk from the exposure to the Sun's UV rays for the average person.
Note: In October, the average maximum UV index of 10 translate into the following recommendations:
Take special precautions, as unprotected skin can be damaged and can burn quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.