September weather forecast
Borie, French Guiana

September in Borie rings in a marked decline in temperatures and rainfall from August. A welcomed decrease in cloud cover allows for increased sunshine and clearer skies. The city revels in minimum annual rainfall, with just 29mm (1.14") occurring over the month, ushering in drier days. Moving forward, October's forecast predicts a slight uptick in temperatures while maintaining the same pleasant weather. The reduced rainfall and cooler temperatures offer the best weather for sightseeing and outdoor exploration.

Temperature

The yearly peak temperatures occur in September and October, averaging a high-temperature of 30.9°C (87.6°F).

Heat index

In September, the heat index is evaluated at a blistering 40°C (104°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
Be advised, the heat index considers values for conditions in shade and with a light breeze. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. 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 that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

The months with the lowest humidity in Borie are September and October, with an average relative humidity of 77%.

Rainfall

September is the month with the least rainfall in Borie. Rain falls for 14.3 days and accumulates 29mm (1.14") of precipitation.

Daylight

In Borie, French Guiana, the average length of the day in September is 12h and 8min.
On the first day of September, sunrise is at 06:27 and sunset at 18:39. On the last day of the month, sunrise is at 06:21 and sunset at 18:25 -03.

Sunshine

September has the most sunshine of the year in Borie, with an average of 9.3h of sunshine.

UV index

The months with the highest UV index in Borie, French Guiana, are July through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Prevent overexposure. Protection from the sun's harmful effects is needed. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.