September weather forecast
Monterrey, Mexico

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The sun setting over Monterrey, Mexico with a far view of the Sierra Madre mountain ranges
The sun setting over Monterrey, Mexico with a far view of the Sierra Madre mountain ranges

Weather in September

As Monterrey moves into September, the city experiences a noticeable reduction in temperature down to 27.6°C (81.7°F) from the summer excesses, indicating the onset of autumn. Interestingly, the cloud coverage increases significantly, indicating a considerably cloudier skyline. Daylight hours shorten as might be expected with the seasonal transition, and yet, the number of sunshine hours stays consistent. September brings slightly stronger winds, creating an ambience of change in Monterrey’s weather. As the UV index drops, city dwellers start to welcome the cooler autumn climate.

Temperature

The transition into September subtly indicates a reduction in the average high-temperature, down to a moderately hot 27.6°C (81.7°F) from August's tropical 31.7°C (89.1°F). Monterrey's September nights cool down to an average low-temperature of 19.1°C (66.4°F).

Heat index

The average heat index in September is evaluated at a hot 30°C (86°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Bear in mind that the heat index values are determined for shaded areas and light breezes. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.

Humidity

September is the most humid month, with an average relative humidity of 69%.

Rainfall

In Monterrey, Mexico, in September, during 22.8 rainfall days, 101mm (3.98") of precipitation is typically accumulated. In Monterrey, during the entire year, the rain falls for 158.3 days and collects up to 602mm (23.7") of precipitation.

Snowfall

January through November are months without snowfall.

Daylight

In September, the average length of the day is 12h and 17min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:00 pm. On the last day of September, sunrise is at 6:33 am and sunset at 6:28 pm CST.

Sunshine

In Monterrey, the average sunshine in September is 8.7h.

UV index

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: During September, 6 as the daily maximum UV index converts into the following advice:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Boost your sun resistance with garments that are densely woven yet spacious.

Frequently asked questions

What are the temperatures in Monterrey in September?

The high-temperature during September is 27.6°C (81.7°F) and the low-temperature is 19.1°C (66.4°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, in September is evaluated at 30°C (86°F).

What is the most humid month in Monterrey?

The most humid month in Monterrey, Mexico, is September, with an average relative humidity of 69%.

What is the average humidity in September in Monterrey?

The average relative humidity in September in Monterrey, Mexico, is 69%.

How much does it rain in Monterrey in September?

In Monterrey, Mexico, in September, during 22.8 rainfall days, 101mm (3.98") of precipitation is typically accumulated.

When it does not snow in Monterrey?

In Monterrey, Mexico, snow does not fall in January through November.

How many hours of daylight does Monterrey have in September?

In September, the average day length in Monterrey is 12h and 17min.

When are sunrise and sunset in September in Monterrey?

In September, on the first day of the month, sunrise is at 6:21 am and sunset at 7:00 pm. On the last day of the month, in Monterrey, Mexico, sunrise is at 6:33 am and sunset at 6:28 pm CST.

How long on average sun shines in September in Monterrey?

In September, the average sunshine duration in Monterrey, Mexico, is 8.7h.

How high is the UV index in September in Monterrey?

The average daily maximum UV index in September in Monterrey, Mexico, is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Monterrey, Mexico

Average temperature in September - Monterrey, Mexico
  • Average high temperature in September: 27.6°C

The warmest month (with the highest average high temperature) is August (31.7°C).
The month with the lowest average high temperature is January (18.5°C).

  • Average low temperature in September: 19.1°C

The month with the highest average low temperature is August (20.8°C).
The coldest month (with the lowest average low temperature) is January (8.3°C).

Average pressure in September
Monterrey, Mexico

Average pressure in September - Monterrey, Mexico
  • Average pressure in September: 1014.2mbar

The month with the highest atmospheric pressure is January (1019.5mbar).
The month with the lowest atmospheric pressure is May (1011.6mbar).

Average wind speed in September
Monterrey, Mexico

Average wind speed in September - Monterrey, Mexico
  • Average wind speed in September: 9km/h

The windiest months (with the highest average wind speed) are June and July (11.9km/h).
The calmest month (with the lowest average wind speed) is December (7.4km/h).

Average humidity in September
Monterrey, Mexico

Average humidity in September - Monterrey, Mexico
  • Average humidity in September: 69%

The month with the highest relative humidity is September (69%).
The month with the lowest relative humidity is April (50%).

Average rainfall in September
Monterrey, Mexico

Average rainfall in September - Monterrey, Mexico
  • Average rainfall in September: 101mm

The wettest month (with the highest rainfall) is May (105mm).
The driest month (with the least rainfall) is February (12mm).

Average rainfall days in September
Monterrey, Mexico

Average rainfall days in September - Monterrey, Mexico
  • Average rainfall days in September: 22.8 days

The month with the highest number of rainy days is September (22.8 days).
The month with the least rainy days is December (6 days).

Average snowfall in September
Monterrey, Mexico

Average snowfall in September - Monterrey, Mexico
  • Average snowfall in September: 0mm

The month with the highest snowfall is December (6mm).
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0mm).

Average snowfall days in September
Monterrey, Mexico

Average snowfall days in September - Monterrey, Mexico
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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

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

The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is November (Average sunshine: 7h and 0min).

Average sunshine days in September
Monterrey, Mexico

Average sunshine days in September - Monterrey, Mexico
  • Average sunshine days in September: 5.5 days

The month with the most sunshine days is December (21.5 days).
The month with the least sunshine days is September (5.5 days).

Average UV index in September
Monterrey, Mexico

Average UV index in September - Monterrey, Mexico
  • Average UV index in September: 6

The months with the highest UV index are May and July (UV index 7).
The months with the lowest UV index are January and December (UV index 4).

Average cloud cover in September
Monterrey, Mexico

Average cloud cover in September - Monterrey, Mexico
  • Average cloud cover in September: 33

The month with the most cloud cover is September (Cloud cover 33).
The month with the least cloud cover is August (Cloud cover 15).

Average visibility in September
Monterrey, Mexico

Average visibility in September - Monterrey, Mexico
  • Average visibility in September: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (10km).
The month with the lowest visibility is September (9km).

Monterrey, Mexico

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