September weather forecast
Lancaster, Guyana

The first month of the autumn, September, is still a hot month in Lancaster, Guyana, with temperature in the range of an average high of 33.6°C (92.5°F) and an average low of 22.1°C (71.8°F).

Temperature

September stands out as Lancaster's warmest month, with an average high-temperature of 33.6°C (92.5°F) and a low-temperature of 22.1°C (71.8°F).

Heat index

In September, the average heat index is calculated to be a burning hot 50°C (122°F). Attention: Heat exhaustion and heat cramps are quite likely. Heatstroke becomes a risk with continued exertion.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

In Lancaster, the average relative humidity in September is 79%.

Rainfall

In Lancaster, Guyana, during September, the rain falls for 21.3 days and regularly aggregates up to 60mm (2.36") of precipitation. Throughout the year, there are 297.5 rainfall days, and 1129mm (44.45") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 9min.
On the first day of the month, sunrise is at 05:46 and sunset at 17:59. On the last day of September, sunrise is at 05:40 and sunset at 17:44 -04.

Sunshine

In September, the average sunshine in Lancaster is 8.8h.

UV index

The months with the highest UV index are June through November, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 7 transforms into these recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.