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

Tulum's May reports an average high-temperature of a hot 30.7°C (87.3°F), exhibiting a minor difference from April. Throughout May, a steady low-temperature average of 24.9°C (76.8°F) is noted.

Heat index

May's average heat index is appraised at a fiery hot 39°C (102.2°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Heat index details are generally centered around shaded locations and a mild breeze. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Tulum, the average relative humidity in May is 76%.

Rainfall

In Tulum, Mexico, in May, it is raining for 16.3 days, with typically 66mm (2.6") of accumulated precipitation. In Tulum, during the entire year, the rain falls for 210.8 days and collects up to 810mm (31.89") of precipitation.

Sea temperature

In Tulum, the average seawater temperature in May is 28°C (82.4°F).
Note: For any water activity, having surface water temperatures from 25°C (77°F) to 29°C (84.2°F) is considered outstanding and highly delightful for lengthened periods.

Daylight

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

Sunshine

In May, the average sunshine is 8.9h.

UV index

March through September, with an average maximum UV index of 7, are months with the highest UV index in Tulum. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: A daily maximum UV index of 7 in May translates into the following instructions:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take caution! The UV rays from the Sun gain strength from sand and water reflections.