October weather forecast
Cozumel, Mexico

As October dawns, the rainfall continues to dominate the Cozumel weather. A further decrease in daylight hours suggests the forthcoming arrival of winter. The UV index dips to 9, but sun protection remains essential during midday. Despite these changes, the sea temperature remains high at 84.2°F (29°C). As a record, the month experiences the highest number of rainfall days, amounting to 15.7.

Temperature

The average high-temperature in Cozumel is a still hot 87.3°F (30.7°C) in October, hardly different from the 89.4°F (31.9°C) recorded in September. Cozumel's nights in October cool down to an average low-temperature of 73.6°F (23.1°C).

Heat index

The heat index for October is estimated at an extremely hot 107.6°F (42°C). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', arises from combining readings of air temperature and relative moisture content. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In October, the average relative humidity is 85%.

Rainfall

The month with the most rainfall is October, when the rain falls for 15.7 days and typically aggregates up to 9.57" (243mm) of precipitation.

Sea temperature

July through October, with an average sea temperature of 84.2°F (29°C), are months with the warmest seawater in Cozumel.
Note: Ideal surface water temperatures for any water activity fall between 77°F (25°C) and 84.2°F (29°C), offering maximum enjoyment for lengthened periods.

Daylight

In October, the average length of the day is 11h and 40min.
On the first day of October, sunrise is at 6:38 am and sunset at 6:35 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:13 pm EST.

Sunshine

In Cozumel, the average sunshine in October is 6.2h.

UV index

In Cozumel, the average daily maximum UV index in October is 9. A UV Index of 8 to 10 symbolizes a very high health hazard from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 9 during October translates into these guidelines:
Be sure to take precautions. Without protection, skin might suffer damage quickly. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Directly after swimming or an outdoor workout, generously apply and reapply a broad-spectrum SPF 30+ sunscreen. Warning! The reflection of sand and water increases the UV dose.