September weather forecast
Stone Town, Tanzania

As the calendar turns to September, Stone Town witnesses a slight increase in rainfall but still maintains comfortable conditions for experiencing Tanzanian life. Despite the slight increase in rainfall from 38mm (1.5") in August to 31mm (1.22") in September, the month continues to be relatively dry. Another consequence of the transition into October is an upturn in the UV index, leading to heightened sunlight intensity. Because of the temperature increase in September compared to August, the town experiences a gradual return to hotter days. Therefore, despite the slight reduction in wind speed compared to August and October, the climate remains highly enjoyable due to the consistent warm weather.

Temperature

The onset of September marks an average high-temperature of a still moderately hot 27.2°C (81°F), hardly differing from August's 26.8°C (80.2°F). In Stone Town, September is characterized by an average low-temperature of 23.9°C (75°F), indicating a minor drop from daytime highs.

Heat index

The heat index for September is estimated at a tropical 30°C (86°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Given the heat index, its values are aligned with shaded sites and gentle winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', offers an insight into how hot it feels when we factor in moisture content. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.

Humidity

The average relative humidity in September in Stone Town is 76%.

Rainfall

September is the month with the least rainfall in Stone Town, Tanzania. Rain falls for 17.2 days and accumulates 31mm (1.22") of precipitation.

Daylight

The average length of the day in September is 12h and 4min.
On the first day of September, sunrise is at 06:23 and sunset at 18:23. On the last day of the month, sunrise is at 06:08 and sunset at 18:17 EAT.

Sunshine

In September, the average sunshine is 8.7h.

UV index

April through September, with an average maximum UV index of 6, are months with the lowest UV index in Stone Town. 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: A daily maximum UV index of 6 in September translates into the following instructions:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.