September weather forecast
Zacapa, Guatemala

Zacapa's weather in September maintains general consistency with August. An increase in rain and decrease in sunshine hours predict more cloud cover in the sky. In spite of the relatively high rainfall, temperatures remain fairly stable, offering a pleasant blend of warmth and rainfall. However, the wind gusts slightly decline, creating a calm environment throughout the month. A distinct decrease in rainfall and temperatures will be noticeable as the weather transitions into October.

Temperature

As Zacapa, Guatemala, steps into September, the average high-temperature is measured at a still warm 29.5°C (85.1°F), displaying minor differences from August's 29.7°C (85.5°F). Throughout September nights, Zacapa experiences a consistent temperature average of 18.7°C (65.7°F).

Heat index

September's average heat index is appraised at a torrid 37°C (98.6°F). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', evaluates the perceived heat by adding the effect of moisture in the air. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In Zacapa, Guatemala, the average relative humidity in September is 83%.

Rainfall

In September, the rain falls for 23.2 days. Throughout September, 98mm (3.86") of precipitation is accumulated. Throughout the year, in Zacapa, there are 193.9 rainfall days, and 636mm (25.04") of precipitation is accumulated.

Daylight

In Zacapa, the average length of the day in September is 12h and 13min.
On the first day of the month, sunrise is at 05:45 and sunset at 18:09. On the last day of September, in Zacapa, Guatemala, sunrise is at 05:47 and sunset at 17:47 CST.

Sunshine

In September, the average sunshine is 8.3h.

UV index

The average daily maximum UV index in September in Zacapa is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, the maximum UV index of 6 translates into these guidelines:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.