October weather forecast
Hanoi, Vietnam

October in Hanoi brings in the autumn with slightly chillier temperatures. A remarkable attribute of this month's weather would be the sharp decrease in precipitation to 46mm (1.81"), compared to the previous high rainfall months. This reduction in rainfall, coupled with pleasant temperatures, sets a calming ambiance in the city. Moving into November, the city preserves this decrease in rainfall whilst experiencing further cooling temperatures.

Temperature

October's arrival brings an average high-temperature of a moderately hot 29.6°C (85.3°F), slightly deviating from September's 31.7°C (89.1°F). In October, the average low-temperature in Hanoi records at an agreeable 22.1°C (71.8°F) during the nights.

Heat index

Throughout October, the heat index is estimated at a very hot 35°C (95°F). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
Factoring in the heat index, values are geared towards shaded areas with light breezes. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. 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. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly meaningful for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

In October, the average relative humidity in Hanoi is 74%.

Rainfall

In Hanoi, in October, during 14 rainfall days, 46mm (1.81") of precipitation is typically accumulated. Throughout the year, in Hanoi, there are 181.2 rainfall days, and 595mm (23.43") of precipitation is accumulated.

Daylight

In Hanoi, the average length of the day in October is 11h and 40min.
On the first day of October in Hanoi, sunrise is at 05:47 and sunset at 17:44. On the last day of the month, sunrise is at 05:58 and sunset at 17:21 +07.

Sunshine

In Hanoi, the average sunshine in October is 6.9h.

UV index

In October, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: In October, the average maximum UV index of 6 translates into the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.