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 29°C (84.2°F). As a record, the month experiences the highest number of rainfall days, amounting to 15.7.

Temperature

October's weather in Cozumel displays an average high-temperature of a still tropical 30.7°C (87.3°F), slightly varied from September's 31.9°C (89.4°F). In Cozumel, the nighttime temperature averages to a moderately hot 23.1°C (73.6°F) during October.

Heat index

The average heat index in October is computed to be a blistering 42°C (107.6°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

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 243mm (9.57") of precipitation.

Sea temperature

July through October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater.
Note: Water activities including swimming and diving at temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed very pleasurable and enjoyable for extended periods, devoid of discomfort.

Daylight

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

Sunshine

The average sunshine in October is 6.2h.

UV index

The average daily maximum UV index in October is 9. A UV Index estimate of 8 to 10 represents a very high threat to health from exposure to the Sun's UV radiation for the average person.
Note: During October, 9 as the daily maximum UV index converts into the following advice:
Never neglect to protect yourself. Eyes and skin can suffer swift damage. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Use liberally and reapply a broad-spectrum SPF 30+ sunscreen every two hours, or straight away after any outdoor workout or swim. Attention! The combination of sand and water reflections enhances UV ray intensity.