September weather forecast
Riberalta, Bolivia

September in Riberalta presents a similar weather pattern as August. Despite a slight decrease in temperature, the city’s climate remains comparably hot. A marked increase in rainfall from 9mm (0.35") to 28mm (1.1") points towards the conclusion of the dry season. Notably, the increased cloud cover helps obscure the intense sunshine, offering moments of relief. As September passes, Riberalta begins its gradual reversion to rainier days, signifying the opening chapters of the wet season.

Temperature

September brings the highest temperatures in Riberalta, with an average high of 35.8°C (96.4°F) and an average low of 22.5°C (72.5°F).

Heat index

In September, the average heat index is computed to be a life-threatening hot 45°C (113°F). Take heed: Heat exhaustion and heat cramps are anticipated. Heatstroke is a potential outcome of continuous activity.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

The average relative humidity in September is 56%.

Rainfall

In September, in Riberalta, the rain falls for 10.6 days. Throughout September, 28mm (1.1") of precipitation is accumulated. In Riberalta, during the entire year, the rain falls for 224 days and collects up to 1199mm (47.2") of precipitation.

Daylight

The average length of the day in September is 12h and 3min.
On the first day of September, sunrise is at 06:26 and sunset at 18:21. On the last day of the month, sunrise is at 06:08 and sunset at 18:19 -04.

Sunshine

In Riberalta, the average sunshine in September is 9.2h.

UV index

The months with the highest UV index in Riberalta are July through November, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 7 in September translates into these instructions:
Guard oneself from overexposure. Defence against sun injury is vital. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Opt for tightly woven and loose clothing to enhance protection from the Sun.