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 (2.76") 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

During September, Merida observes a subtle ascent to a tropical 33.6°C (92.5°F) from August's 35°C (95°F) in the average high-temperature. In Merida, September's nights observe an average temperature dip to a moderately hot 23.3°C (73.9°F).

Heat index

The heat index value for September is appraised at a blazing hot 49°C (120.2°F). Be careful: Heat exhaustion and heat cramps are probable. Heatstroke may result from extended activity.
One should consider that heat index numbers are for shaded settings and light wind. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', provides an understanding of perceived warmth by combining temperature and relative humidity. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

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

Rainfall

In Merida, in September, during 20.4 rainfall days, 70mm (2.76") of precipitation is typically accumulated. In Merida, during the entire year, the rain falls for 167.3 days and collects up to 536mm (21.1") of precipitation.

Daylight

The average length of the day in September in Merida is 12h and 16min.
On the first day of September in Merida, sunrise is at 5:42 am and sunset at 6:13 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 5:46 pm CST.

Sunshine

In September, the average sunshine 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 value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the UV index of 7 transforms into the following advice:
Inhibit overexposure. Warding off sun damage is of utmost importance. 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. Experience reduced UV exposure by about half when donning a wide-brim hat.
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Frequently asked questions

How hot is it in Merida in September?

The average high-temperature and low-temperature during September are 33.6°C (92.5°F) and 23.3°C (73.9°F) respectively. In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 49°C (120.2°F).

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

How much does it rain in Merida in September?

In Merida, in September, during 20.4 rainfall days, 70mm (2.76") of precipitation is typically accumulated.

How many hours of daylight does Merida have in September?

The average day length in September in Merida, Mexico, is 12h and 16min.

What time are sunrise and sunset in September in Merida?

On the first day of September in Merida, sunrise is at 5:42 am and sunset at 6:13 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 5:46 pm CST.

How long on average sun shines in September in Merida?

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

What is the month with the highest UV index in Merida?

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

What is the UV index reading in September in Merida?

In September, the average daily maximum UV index in Merida, Mexico, is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.

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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