September weather forecast
Manzanillo, Mexico

The first month of the autumn, September, is also a moderately hot month in Manzanillo, Mexico, with an average temperature varying between 25°C (77°F) and 29.5°C (85.1°F).

Temperature

Transitioning into September, Manzanillo experiences an average high-temperature of a moderately hot 29.5°C (85.1°F), marking a minor shift from the preceding month. Manzanillo encounters a small divergence from daytime high temperatures, averaging a low-temperature of 25°C (77°F) during September nights.

Heat index

September's average heat index is evaluated at a very hot 36°C (96.8°F). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a calculation that merges air temperature and relative humidity to depict the sensation of 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. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

September is the most humid month, with an average relative humidity of 80%.

Rainfall

September is the month with the most rainfall. Rain falls for 24.6 days and accumulates 180mm (7.09") of precipitation.

Sea temperature

In Manzanillo, Mexico, in September, the average water temperature is 29.8°C (85.6°F).
Note: Surface water temperatures falling between 25°C (77°F) and 29°C (84.2°F) are regarded as prime and extremely agreeable for enduring periods during any water activity.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of September in Manzanillo, sunrise is at 6:42 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:46 pm CST.

Sunshine

The months with the least sunshine are August and September, with an average of 8.9h of sunshine.

UV index

April through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Warning! Sand and water reflections boost the intensity of UV exposure.