May weather forecast
Tulum, Mexico

Weather in May is the entry point into the rainy season and an onset of a slight increase in average humidity for Tulum. The highlight for this month is a sharp surge in rainfall, registering a jump to 66mm (2.6") from 31mm (1.22") in April. The town remains hot with a slight increase in night temperatures and daylight peaking at 13.1 hours. This shift in the weather pattern lets visitors experience a mix of sun, heat, and occasionally refreshing showers. Surf and sand enthusiasts will be pleased as sea temperatures climb to a warm 28°C (82.4°F).

Temperature

On the advent of May, Tulum's average high-temperature exhibits a minor adjustment to a hot 30.7°C (87.3°F) from April's 29.8°C (85.6°F). Throughout May, the temperature tends to fall to a consistent average low of 24.9°C (76.8°F).

Heat index

May's mean heat index is appraised at a fiery hot 39°C (102.2°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', blends air temperature and moisture content to represent the felt temperature to humans. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

The average relative humidity in May is 76%.

Rainfall

In Tulum, in May, it is raining for 16.3 days, with typically 66mm (2.6") of accumulated precipitation. Throughout the year, there are 210.8 rainfall days, and 810mm (31.89") of precipitation is accumulated.

Sea temperature

In Tulum, in May, the average water temperature is 28°C (82.4°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as ideal and highly pleasant for extended enjoyment in all water activities.

Daylight

The average length of the day in May is 13h and 6min.
On the first day of the month, sunrise is at 6:19 am and sunset at 7:13 pm. On the last day of May, sunrise is at 6:09 am and sunset at 7:25 pm EST.

Sunshine

The average sunshine in May is 8.9h.

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 in May interprets into the following advice:
Prevent overexposure. Protection from the sun's harmful effects is needed. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be alert! The reflection of water and sand augments UV radiation intensity.