September weather forecast
Merida, Mexico

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The Santa Ana Church in Merida, Mexico, surrounded by beautiful flowers and palm trees
The Santa Ana Church in Merida, Mexico, surrounded by beautiful flowers and palm trees

Weather in September

With the commencement of September, the weather takes another turn in Merida. The city receives the highest amount of rainfall, up to 70mm on average, as compared to other months. Even though the rainfall is significant, temperatures remain quite high. The overall weather can be described as rainy and humid, making it ideal for indoor activities. Since outdoor activities may get hindered due to significant rainfall, flexible plans are advised.

Temperature

August's transformation into September witnesses an average high-temperature of a tropical 33.6°C in Merida, noting a minor change from the preceding month. Throughout September, Merida witnesses a consistent average low-temperature of 23.3°C.

Heat index

During September, the heat index is computed to be a life-threatening hot 49°C. Be cautious: Heat exhaustion along with heat cramps are predicted. Heatstroke is a possible consequence of continuous physical effort.
The standards for the heat index are set for locations in shade and under light breezes. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'felt air temperature', comes about by integrating the temperature readings with the humidity levels. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

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

Rainfall

In Merida, during September, the rain falls for 20.4 days and regularly aggregates up to 70mm of precipitation. In Merida, during the entire year, the rain falls for 167.3 days and collects up to 536mm of precipitation.

Daylight

In September, the average length of the day is 12h and 16min.
On the first day of the month, sunrise is at 5:42 am and sunset at 6:14 pm. On the last day of September, in Merida, sunrise is at 5:49 am and sunset at 5:47 pm CST.

Sunshine

In Merida, the average sunshine in September is 9.4h.

UV index

The months with the highest UV index in Merida are February through October, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: In September, a regular UV index of 7 translates into these guidelines:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
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FAQ

How hot does it get in Merida in September?

September temperatures in Merida vary between a high-temperature of 33.6°C and a low-temperature of 23.3°C. In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is computed to be 49°C.

What is the most humid month in Merida?

The months with the highest humidity in Merida, Mexico, are September and October, with an average relative humidity of 78%.

What is the average humidity in September in Merida?

In September, the average relative humidity in Merida, Mexico, is 78%.

How many days does it rain in September in Merida?

In Merida, Mexico, in September, it is raining for 20.4 days, with typically 70mm of accumulated precipitation.

How many hours of daylight does Merida have in September?

In September, the average day length in Merida is 12h and 16min.

When are sunrise and sunset in September in Merida?

In September, on the first day of the month, sunrise is at 5:42 am and sunset at 6:14 pm. On the last day of the month, in Merida, Mexico, sunrise is at 5:49 am and sunset at 5:47 pm CST.

How long on average sun shines in September in Merida?

The average sunshine duration in September in Merida, Mexico, is 9.4h.

What are the months with the highest UV index in Merida?

February through October, with an average maximum UV index of 7, are months with the highest UV index in Merida.

What is the UV index intensity in September in Merida?

In September, the average daily maximum UV index in Merida, Mexico, is 7. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Merida, Mexico

Average temperature in September - Merida, Mexico
  • Average high temperature in September: 33.6°C

The warmest month (with the highest average high temperature) is May (35.4°C).
The month with the lowest average high temperature is January (28.1°C).

  • Average low temperature in September: 23.3°C

The month with the highest average low temperature is June (24.3°C).
The coldest month (with the lowest average low temperature) is January (18.6°C).

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Average pressure in September
Merida, Mexico

Average pressure in September - Merida, Mexico
  • Average pressure in September: 1011.9mbar

The month with the highest atmospheric pressure is January (1017.6mbar).
The month with the lowest atmospheric pressure is September (1011.9mbar).

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Average wind speed in September
Merida, Mexico

Average wind speed in September - Merida, Mexico
  • Average wind speed in September: 10.6km/h

The windiest month (with the highest average wind speed) is March (16.1km/h).
The calmest month (with the lowest average wind speed) is September (10.6km/h).

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Average humidity in September
Merida, Mexico

Average humidity in September - Merida, Mexico
  • Average humidity in September: 78%

The months with the highest relative humidity are September and October (78%).
The months with the lowest relative humidity are April and May (63%).

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Average rainfall in September
Merida, Mexico

Average rainfall in September - Merida, Mexico
  • Average rainfall in September: 70mm

The wettest month (with the highest rainfall) is June (99mm).
The driest months (with the least rainfall) are February and March (12mm).

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Average rainfall days in September
Merida, Mexico

Average rainfall days in September - Merida, Mexico
  • Average rainfall days in September: 20.4 days

The month with the highest number of rainy days is September (20.4 days).
The months with the least rainy days are February and March (7.2 days).

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Average daylight in September /
Average sunshine in September
Merida, Mexico

Average daylight in September / Average sunshine in September - Merida, Mexico
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is May (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).

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Average sunshine days in September
Merida, Mexico

Average sunshine days in September - Merida, Mexico
  • Average sunshine days in September: 8.8 days

The month with the most sunshine days is March (21.8 days).
The month with the least sunshine days is October (8.5 days).

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Average UV index in September
Merida, Mexico

Average UV index in September - Merida, Mexico
  • Average UV index in September: 7

The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, November and December (UV index 6).

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Average cloud cover in September
Merida, Mexico

Average cloud cover in September - Merida, Mexico
  • Average cloud cover in September: 34

The month with the most cloud cover is January (Cloud cover 36).
The months with the least cloud cover are March and April (Cloud cover 25).

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Average visibility in September
Merida, Mexico

Average visibility in September - Merida, Mexico
  • Average visibility in September: 8km

The months with the highest visibility are February, March, April, May and June (10km).
The month with the lowest visibility is September (8km).

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Merida, Mexico

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