September weather forecast
Telemán, Guatemala

The first month of the autumn, September, is still a warm month in Telemán, Guatemala, with temperature in the range of an average low of 18.7°C (65.7°F) and an average high of 29.5°C (85.1°F).

Temperature

Telemán records an average high-temperature of a still warm 29.5°C (85.1°F) in September, maintaining a close correlation with August's 29.7°C (85.5°F). September generally records an average low-temperature of 18.7°C (65.7°F).

Heat index

September's mean heat index is appraised at a very hot 37°C (98.6°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'real feel', arises from combining readings of air temperature and relative moisture content. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

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

Rainfall

In Telemán, during September, the rain falls for 23.2 days and regularly aggregates up to 98mm (3.86") of precipitation. Throughout the year, there are 193.9 rainfall days, and 636mm (25.04") of precipitation is accumulated.

Daylight

In Telemán, the average length of the day in September is 12h and 13min.
On the first day of September, sunrise is at 05:46 and sunset at 18:10. On the last day of the month, sunrise is at 05:48 and sunset at 17:48 CST.

Sunshine

The average sunshine in September is 8.3h.

UV index

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: In September, the maximum UV index of 6 suggests this advice:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.