Merida
Mexico
Long-term weather forecast
Long-term weather forecast

October weather forecast and climate
Merida, Mexico

Scenic spring view of the Santa Ana Church in Merida, Mexico, surrounded by beautiful flowers and palm trees
Scenic spring view of the Santa Ana Church in Merida, Mexico, surrounded by beautiful flowers and palm trees
October, the same as September, in Merida, Mexico, is another hot autumn month, with average temperature fluctuating between 20.8°C (69.4°F) and 32.7°C (90.9°F).

Temperature

In October, the average high-temperature is almost the same as in September - a still tropical 32.7°C (90.9°F). In October, the average low-temperature is 20.8°C (69.4°F).

Heat index

The average heat index in October is calculated to an extremely hot 44.7°C (112.5°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like differences in body mass, height, and shape, pregnancy, clothing, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In October, the average relative humidity in Merida is 75%.

Rainfall

In Merida, during October, the rain falls for 9.7 days and regularly aggregates up to 127.9mm (5") of precipitation. In Merida, during the entire year, the rain falls for 86.6 days and collects up to 1036.9mm (40.8") of precipitation.

Daylight

In October, the average length of the day in Merida is 11.7h.

Sunshine

In Merida, the average sunshine is 7h.

UV index

In Merida, Mexico, the average daily maximum UV index is 10. A UV Index of 8 to 10 symbolizes a very high threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 10 in October interpret into the following advice:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.

What is the temperature in October in Merida?

In October, in Merida, Mexico, the average high-temperature is 32.7°C (90.9°F), and the average low-temperature is 20.8°C (69.4°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that calculates temperature value influenced by the moisture in the air, in October is evaluated at 44.7°C (112.5°F).

What is the average humidity in October in Merida?

In October, the average relative humidity in Merida, Mexico, is 75%.

How many days does it rain in October in Merida?

In Merida, Mexico, during October, the rain falls for 9.7 days and regularly aggregates up to 127.9mm (5") of precipitation.

What is the average length of the day in October in Merida?

In Merida, the average length of the day in October is 11.7h.

How long on average sun shines in October in Merida?

The average sunshine in October in Merida, Mexico, is 7h.

What is the UV index reading in October in Merida?

The average daily maximum UV index in October in Merida is 10. A UV Index estimate of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in October - Merida, Mexico
  • Average high temperature in October: 32.7°C

The warmest month (with the highest average high temperature) is May (36.3°C).
The month with the lowest average high temperature is December (30.6°C).

  • Average low temperature in October: 20.8°C

The month with the highest average low temperature is May (21.7°C).
The coldest month (with the lowest average low temperature) is January (17.2°C).

Average humidity in October - Merida, Mexico
  • Average humidity in October: 75%

The month with the highest relative humidity is September (76%).
Months with the lowest relative humidity are March and May (63%).

Average rainfall in October - Merida, Mexico
  • Average rainfall in October: 127.9mm

The wettest month (with the highest rainfall) is September (183.1mm).
The driest month (with the lowest rainfall) is March (22.5mm).

Average rainfall days in October - Merida, Mexico
  • Average rainfall days in October: 9.7 days

The month with the highest number of rainy days is September (13.9 days).
The month with the lowest number of rainy days is April (1.9 days).

Average daylight in October / Average sunshine in October - Merida, Mexico
  • Average daylight in October: 11.7h

The month with the longest days is June (Average daylight: 13.4h).
The month with shortest days is December (Average daylight: 10.9h).

  • Average sunshine in October: 7h

The month with most sunshine is May (Average sunshine: 8.8h).
The month with least sunshine is December (Average sunshine: 6.5h).

Average UV index in October - Merida, Mexico
  • Average UV index in October: 10

Months with the highest UV index are April, May, June, July and August (UV index 12).
Months with the lowest UV index are January and December (UV index 7).