Guaymas
Mexico
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Guaymas, Mexico

The first month of the autumn, September, is also a sweltering month in Guaymas, Mexico, with average temperature fluctuating between 27°C (80.6°F) and 35.3°C (95.5°F).

Temperature

In Guaymas, Mexico, the average high-temperature is relatively the same as in August - a still torrid 35.3°C (95.5°F). In September, the average low-temperature is 27°C (80.6°F).

Heat index

In September, the average heat index is appraised at a life-threatening hot 47°C (116.6°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
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 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, pregnancy, wind), and activity. 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 especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Guaymas, the average relative humidity in September is 62%.

Rainfall

In Guaymas, Mexico, in September, during 3.2 rainfall days, 35mm (1.4") of precipitation is typically accumulated. Throughout the year, in Guaymas, there are 27.2 rainfall days, and 218.2mm (8.6") of precipitation is accumulated.

Sea temperature

In Guaymas, the average seawater temperature in September is 30.8°C (87.4°F).
Note: For swimming, other intense water activities, temperature above 30°C (86°F) is arguably unpleasant, as the water cooling effect is missing.

Daylight

The average length of the day in Guaymas is 12.3h.

Sunshine

In September, the average sunshine is 7.9h.

What is the temperature in September in Guaymas?

The average high-temperature, in September, in Guaymas, Mexico, is 35.3°C (95.5°F), while the average low-temperature is 27°C (80.6°F). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that factores the actual air temperature with the relative humidity, is appraised at 47°C (116.6°F).

What is the average humidity in September in Guaymas?

In Guaymas, the average relative humidity in September is 62%.

How many days does it rain in September in Guaymas?

In Guaymas, Mexico, during September, the rain falls for 3.2 days and regularly aggregates up to 35mm (1.4") of precipitation.

What is the sea water temperature in September in Guaymas?

In Guaymas, in September, the average water temperature is 30.8°C (87.4°F). The surface water temperatures above 30°C (86°F) are arguably considered as unpleasant for swimming, and any intense water activity, as the refreshing effect of water is missing.

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

In Guaymas, the average length of the day in September is 12.3h.

How many hours of sunshine does Guaymas have in September?

In September, the average sunshine is 7.9h.
Average temperature in September - Guaymas, Mexico
  • Average high temperature in September: 35.3°C

The warmest month (with the highest average high temperature) is July (35.5°C).
The month with the lowest average high temperature is January (23.9°C).

  • Average low temperature in September: 27°C

The month with the highest average low temperature is July (27.6°C).
The coldest month (with the lowest average low temperature) is January (13.7°C).

Average humidity in September - Guaymas, Mexico
  • Average humidity in September: 62%

The month with the highest relative humidity is August (66%).
The month with the lowest relative humidity is April (43%).

Average rainfall in September - Guaymas, Mexico
  • Average rainfall in September: 35mm

The wettest month (with the highest rainfall) is August (69.7mm).
The driest month (with the lowest rainfall) is June (0.7mm).

Average rainfall days in September - Guaymas, Mexico
  • Average rainfall days in September: 3.2 days

The month with the highest number of rainy days is August (7.3 days).
The month with the lowest number of rainy days is April (0.2 days).

Average sea temperature in September - Guaymas, Mexico
  • Average sea temperature in September: 30.8°C

The best month for swimming (with the highest average sea temperature) is August (31°C).
The coldest month (with the lowest average sea temperature) is February (17.2°C).

Average daylight in September / Average sunshine in September - Guaymas, Mexico
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.9h).
The month with shortest days is December (Average daylight: 10.4h).

  • Average sunshine in September: 7.9h

The month with most sunshine is June (Average sunshine: 10.1h).
The month with least sunshine is December (Average sunshine: 6.5h).