October weather forecast
Merida, Mexico

The month of October brings a reprieve from the heavy rainfall, with a decline to an average of 65mm (2.56"). The reduction in rainfall paves the way for somewhat drier days. The temperature dips moderately, making the weather slightly cooler. This sets the stage for the city’s transition into the colder months. The slightly cooler climate and reduced rainfall make October a suitable time to visit Merida.

Temperature

In October, the average high-temperature in Merida registers at a still hot 31.5°C (88.7°F), nearly identical to September's 33.6°C (92.5°F). During the month of October, the temperature generally drops to a low average of 22.3°C (72.1°F).

Heat index

During October, the heat index is appraised at a blistering 42°C (107.6°F). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
Heat index data is primarily for areas with shade and subjected to light winds. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is found by incorporating humidity levels into the air temperature measurement. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

September and October, with an average relative humidity of 78%, are the most humid months.

Rainfall

In Merida, during October, the rain falls for 19.6 days and regularly aggregates up to 65mm (2.56") of precipitation. Throughout the year, there are 167.3 rainfall days, and 536mm (21.1") of precipitation is accumulated.

Daylight

The average length of the day in October in Merida is 11h and 40min.
On the first day of October in Merida, sunrise is at 5:49 am and sunset at 5:45 pm. On the last day of the month, sunrise is at 6:00 am and sunset at 5:23 pm CST.

Sunshine

In Merida, Mexico, the average sunshine in October is 7.8h.

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 7 during October translates into these guidelines:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.