September weather forecast
San Borja, Bolivia

September sees the weather in San Borja gently shifting gears. The city undergoes climate shifts further, preparing for the impending incoming wet season. There's an infinitesimal increase in rain compared to the prior months, signaling a change. Ever-present sunshine complements the cityscape, engraving an indelible memory of the fading dry season. A whiff of transformation rejuvenates the atmosphere, establishing a unique identity for September's weather.

Temperature

September tends to be the warmest month in San Borja, Bolivia, with temperatures averaging a daily high of 32.5°C (90.5°F) and a low of 19.4°C (66.9°F).

Heat index

The heat index in September is estimated at a blisteringly hot 40°C (104°F). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', gives an indication of how one might feel in terms of heat after considering 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. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are essentially critical for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

September is the least humid month, with an average relative humidity of 65%.

Rainfall

In San Borja, in September, it is raining for 14.9 days, with typically 102mm (4.02") of accumulated precipitation. Throughout the year, there are 251.7 rainfall days, and 2897mm (114.06") of precipitation is accumulated.

Daylight

In San Borja, Bolivia, the average length of the day in September is 12h and 1min.
On the first day of September in San Borja, sunrise is at 06:31 and sunset at 18:21. On the last day of the month, sunrise is at 06:09 and sunset at 18:23 -04.

Sunshine

In September, the average sunshine is 8.9h.

UV index

January, March, April, June through December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 6 suggests these recommendations:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.