July weather forecast
Cancún, Mexico

July in Cancún maintains the dominant summer climate, with the temperatures hovering around their annual peak. Along with high temperatures, there is an equally high likelihood of rainfall during this month. However, this rainfall is typically brief and sporadic, seldom disrupting outdoor activities for extended periods. Climatic readings in July showcase a high temperature of 30.8°C (87.4°F) and a low at 26.8°C (80.2°F), coupled with a rainfall quotient of 61mm (2.4") covering approximately 19.5 days. The potent sea breeze continues to serve as a respite from the sultry weather providing the perfect environment for a summer getaway.

Temperature

The start of July marks an average high-temperature of a still hot 30.8°C (87.4°F), hardly distinguishable from the conditions in June. July notes an average low temperature of 26.8°C (80.2°F), subtly down from the daytime highs.

Heat index

In July, the heat index is appraised at a fiery hot 39°C (102.2°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

The average relative humidity in July in Cancún, Mexico, is 76%.

Rainfall

In Cancún, in July, during 19.5 rainfall days, 61mm (2.4") of precipitation is typically accumulated. Throughout the year, there are 224.7 rainfall days, and 886mm (34.88") of precipitation is accumulated.

Sea temperature

In Cancún, the average seawater temperature in July is 28.8°C (83.8°F).
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) in water are ideal for swimming, diving, and other activities, providing enjoyment and comfort for extended durations.

Daylight

The average length of the day in July in Cancún is 13h and 16min.
On the first day of July in Cancún, sunrise is at 6:09 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:21 am and sunset at 7:26 pm EST.

Sunshine

The months with the most sunshine in Cancún are July and August, with an average of 9.3h of sunshine.

UV index

The months with the highest UV index in Cancún are March through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: In July, a regular UV index of 7 translates into these guidelines:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be careful! The Sun's UV radiation is accentuated by reflecting off sand and water.