September weather forecast
Princetown, Guyana

The first month of the autumn, September, is still a tropical month in Princetown, Guyana, with an average temperature ranging between min 25.9°C (78.6°F) and max 30.8°C (87.4°F).

Temperature

September, with average temperatures reaching a high of 30.8°C (87.4°F) and a low of 25.9°C (78.6°F), is the warmest month.

Heat index

The heat index in September is estimated at a sweltering 39°C (102.2°F). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', provides an understanding of perceived warmth by combining temperature and relative humidity. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular importance for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

The least humid month is September, with an average relative humidity of 76%.

Rainfall

In Princetown, in September, it is raining for 24.5 days, with typically 141mm (5.55") of accumulated precipitation. In Princetown, during the entire year, the rain falls for 312.6 days and collects up to 2298mm (90.47") of precipitation.

Daylight

In September, the average length of the day in Princetown is 12h and 9min.
On the first day of the month, sunrise is at 05:41 and sunset at 17:55. On the last day of September, in Princetown, Guyana, sunrise is at 05:36 and sunset at 17:40 -04.

Sunshine

The month with the most sunshine is September, with an average of 9.3h of sunshine.

UV index

January, February, April, June through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.