Manzanillo
Mexico
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Manzanillo, Mexico

September, the first month of the autumn, in Manzanillo, is still a tropical month, with average temperature ranging between max 31.7°C (89.1°F) and min 24.5°C (76.1°F).

Temperature

In September, the average high-temperature is relatively the same as in August - a still tropical 31.7°C (89.1°F). In Manzanillo, the average low-temperature is 24.5°C (76.1°F).

Heat index

The average heat index in September is appraised at an extremely hot 42.5°C (108.5°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', 'real feel', 'feels like', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, differences in body mass, height, and shape, metabolic differences). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

The most humid month in Manzanillo is September, with an average relative humidity of 78%.

Rainfall

The month with the most rainfall in Manzanillo, Mexico, is September when the rain falls for 15.8 days and typically aggregates up to 271.1mm (10.7") of precipitation.

Sea temperature

In Manzanillo, the average seawater temperature is 29.8°C (85.6°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Manzanillo, the average length of the day is 12.2h.

Sunshine

With an average of 6.4h of sunshine, September has the least sunshine of the year.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index in Manzanillo. A UV Index estimate of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 12 translate into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in minutes. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in September in Manzanillo?

In Manzanillo, Mexico, in September, the average high-temperature is 31.7°C (89.1°F), and the average low-temperature is 24.5°C (76.1°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines air temperature and relative humidity, is appraised at 42.5°C (108.5°F).

What is the most humid month in Manzanillo?

With an average relative humidity of 78%, September is the most humid month.

What is the average humidity in September in Manzanillo?

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

How much does it rain in Manzanillo in September?

In September, in Manzanillo, the rain falls for 15.8 days. Throughout September, 271.1mm (10.7") of precipitation is accumulated.

What is the rainiest month in Manzanillo?

The month with the most rainfall is September when the rain falls for 15.8 days and typically aggregates up to 271.1mm (10.7") of precipitation.

How warm is the water in September in Manzanillo?

In Manzanillo, Mexico, in September, the average water temperature is 29.8°C (85.6°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in September in Manzanillo?

In Manzanillo, Mexico, the average length of the day in September is 12.2h.

What is the month with the least sunshine in Manzanillo?

With an average of 6.4h of sunshine, September has the least sunshine of the year in Manzanillo.

How many hours of sunshine does Manzanillo have in September?

In September, the average sunshine in Manzanillo, Mexico, is 6.4h.

When is the highest UV index in Manzanillo?

Months with the highest UV index are March through September, with an average maximum UV index of 12.

What is the UV index reading in September in Manzanillo?

In Manzanillo, the average daily maximum UV index in September is 12. A UV Index of 11, and more, symbolizes an extreme health threat from unprotected exposure to the UV radiation.
Average temperature in September - Manzanillo, Mexico
  • Average high temperature in September: 31.7°C

The warmest month (with the highest average high temperature) is August (32.5°C).
The month with the lowest average high temperature is March (29°C).

  • Average low temperature in September: 24.5°C

The month with the highest average low temperature is July (24.9°C).
The coldest month (with the lowest average low temperature) is March (19.5°C).

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

The month with the highest relative humidity is September (78%).
Months with the lowest relative humidity are January and February (70%).

Average rainfall in September - Manzanillo, Mexico
  • Average rainfall in September: 271.1mm

The wettest month (with the highest rainfall) is September (271.1mm).
The driest month (with the lowest rainfall) is April (3.7mm).

Average rainfall days in September - Manzanillo, Mexico
  • Average rainfall days in September: 15.8 days

The month with the highest number of rainy days is September (15.8 days).
Months with the lowest number of rainy days are March and April (0.2 days).

Average sea temperature in September - Manzanillo, Mexico
  • Average sea temperature in September: 29.8°C

The best month for swimming (with the highest average sea temperature) is August (29.9°C).
The coldest month (with the lowest average sea temperature) is March (25.2°C).

Average daylight in September / Average sunshine in September - Manzanillo, Mexico
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 13.3h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in September: 6.4h

The month with most sunshine is May (Average sunshine: 9.2h).
The month with least sunshine is September (Average sunshine: 6.4h).

Average UV index in September - Manzanillo, Mexico
  • Average UV index in September: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).