September weather forecast
Bolivia

September ushers in spring in Bolivia and signifies the end of the dry season. The weather gradually becomes warmer, and the first signs of the wet season start to appear with slight increases in rainfall.

In La Paz, located high in the Andes, September temperatures typically range from 3°C (37.4°F) to 17°C (62.6°F). This gradual warming compared to August, especially during the day, signals the arrival of spring. Rainfall starts to increase, averaging 20mm (0.79"), but the days remain predominantly sunny.

In contrast, Santa Cruz, in the eastern lowlands, experiences more consistent warmth, with temperatures hovering around 27°C (80.6°F). Despite the rising heat, humidity remains relatively low, making the overall weather conditions pleasant.

Throughout Bolivia, September sees a slight increase in rainfall compared to August. Regions of the Amazon Basin, including Rurrenabaque, start receiving more rainfall, averaging 70mm (2.76"), signaling the gradual approach of the wet season.

In the Altiplano region, the Uyuni Salt Flats continue to exhibit their unique, stark beauty under the spring sun. However, as the season progresses, the first signs of the wet season start to appear, with occasional showers creating thin layers of water over the flats.

September in Bolivia marks the beginning of spring and the end of the dry season. The increasing temperatures and the early signs of the wet season signal a change in the country's climatic conditions, affecting various regions in different ways. This month continues to provide favorable conditions for exploring Bolivia's diverse landscapes.

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• La Paz - September »
  In September, on the first day of the month, sunrise is at 06:38 and sunset at 18:26. On the first day of September, sunrise is at 06:38 and sunset at 18:26.
• Santa Cruz de la Sierra - September »
  With an average relative humidity of 64%, September is the least humid month in Santa Cruz de la Sierra, Bolivia. In Santa Cruz de la Sierra, during September, the rain falls for 5.6 days and regularly aggregates up to 58mm (2.28") of precipitation.
• El Alto - September »
  In El Alto in September, it is raining for 8.2 days, with typically 36mm (1.42") of accumulated precipitation. In El Alto, Bolivia, in September, it is raining for 8.2 days, with typically 36mm (1.42") of accumulated precipitation.
• Cochabamba - September »
  In Cochabamba, Bolivia, in September, during 4 rainfall days, 6mm (0.24") of precipitation is typically accumulated. The months with the highest UV index in Cochabamba are January through April, September through December, with an average maximum UV index of 12.
• Oruro - September »
  January through April, September through December, with an average maximum UV index of 12, are months with the highest UV index in Oruro, Bolivia. In Oruro in September, it is raining for 4 days, with typically 15mm (0.59") of accumulated precipitation.
• Sucre - September »
  In Sucre in September, during 4 rainfall days, 23mm (0.91") of precipitation is typically accumulated. On the first day of September in Sucre, sunrise is at 06:28 and sunset at 18:13.
• Potosi - September »
  In Potosi in September, during 2 rainfall days, 10mm (0.39") of precipitation is typically accumulated. The months with the highest UV index in Potosi are January through April, September through December, with an average maximum UV index of 12.
• Tarija - September »
  September weather in Tarija brings a slight increase in daily temperature, marking the beginning of a warm phase. Tarija's September reports an average high-temperature of a still warm 28°C (82.4°F), exhibiting a minor difference from August.
• Trinidad - September »
  On the last day of September, in Trinidad, Bolivia, sunrise is at 06:02 and sunset at 18:16 -04. The onset of September in Trinidad notes an average high-temperature of a still tropical 30.6°C (87.1°F), subtly shifted from August's 30.8°C (87.4°F).
• Cobija - September »
  The average heat index, which takes the relative humidity and factors it into the air temperature reading, in September is calculated to be 43°C (109.4°F). In Cobija, in September, it is raining for 15.1 days, with typically 52mm (2.05") of accumulated precipitation.
• Riberalta - September »
  In Riberalta, Bolivia, in September, it is raining for 10.6 days, with typically 28mm (1.1") of accumulated precipitation. Riberalta reaches its average highest temperatures in September, measuring 35.8°C (96.4°F) at the peak and 22.5°C (72.5°F) at the lowest.
• Montero - September »
  In Montero, Bolivia, during September, the rain falls for 7.7 days and regularly aggregates up to 25mm (0.98") of precipitation. The least humid month in Montero, Bolivia, is September, with an average relative humidity of 51%.