May weather forecast
Merida, Mexico

May continues the pattern of escalating temperatures in Merida. The highest temperature in May can escalate up to 35.4°C, which is the peak temperature Merida experiences during the year. May is characterized by an increased level of humidity and rainfall, heightening the overall heat in the city. Visitors and locals can expect warmer and humid days throughout May. However, evenings can get fairly pleasant with a refreshing breeze.

Temperature

The warmest period in Merida tends to be May, when average temperatures fluctuate between a high of 35.4°C and a low of 24°C.

Heat index

The average heat index in May is computed to be a blazing hot 48°C. Forewarned: Heat cramps and heat exhaustion are anticipated. Ongoing physical activity increases the likelihood of heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

The months with the lowest humidity are April and May, with an average relative humidity of 63%.

Rainfall

In Merida, during May, the rain falls for 12.5 days and regularly aggregates up to 43mm of precipitation. In Merida, during the entire year, the rain falls for 167.3 days and collects up to 536mm of precipitation.

Daylight

In Merida, the average length of the day in May is 13h and 8min.
On the first day of May in Merida, sunrise is at 5:27 am and sunset at 6:23 pm. On the last day of the month, sunrise is at 5:16 am and sunset at 6:35 pm CST.

Sunshine

The month with the most sunshine is May, with an average of 11.1h of sunshine.

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 7 in May translates into the following recommendations:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Enhance your sun protection with tightly woven, yet airy clothing.