September weather forecast
Jetã, Guinea-Bissau

The first month of the autumn, September, is a tropical month in Jetã, Guinea-Bissau, with an average temperature ranging between min 24.7°C (76.5°F) and max 30.9°C (87.6°F).

Temperature

September records an average high-temperature of a tropical 30.9°C (87.6°F), indicating a minor variation from the preceding month. An average nighttime temperature of 24.7°C (76.5°F) is recorded during September.

Heat index

The heat index value for September is estimated at a blisteringly hot 41°C (105.8°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant 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.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

The average relative humidity in September in Jetã is 80%.

Rainfall

In September, in Jetã, the rain falls for 20.5 days. Throughout September, 133mm (5.24") of precipitation is accumulated. Throughout the year, there are 103.1 rainfall days, and 677mm (26.65") of precipitation is accumulated.

Daylight

The average length of the day in September in Jetã, Guinea-Bissau, is 12h and 11min.
On the first day of the month, sunrise is at 06:53 and sunset at 19:13. On the last day of September, sunrise is at 06:52 and sunset at 18:54 GMT.

Sunshine

In September, the average sunshine in Jetã is 7.3h.

UV index

January through June, September through December, with an average maximum UV index of 7, are months with the highest UV index in Jetã. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index of 7 during September translates into these guidelines:
Prevent overexposure. Protection from the sun's harmful effects is needed. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.