Last updated: August 21, 2025
In September, Uyuni, Bolivia, experiences a fascinating transition into spring, characterized by a maximum temperature reaching 23°C (73°F) and an average of 8°C (48°F). Nights can be quite chilly, with temperatures dropping to a minimum of -5°C (23°F). The region remains relatively dry, with only 8 mm (0.3 in) of precipitation occurring on just one day, ensuring that visitors enjoy plenty of sun. The humidity level at 60% adds to the crispness of the air, creating a refreshing atmosphere perfect for exploring the stunning landscapes surrounding the famous salt flats.
As September approaches in Uyuni, Bolivia, the temperatures begin to show subtle signs of transition, heralding the arrival of warmer months. The minimums hover around -5°C (23°F), providing a crisp morning chill, while the average temperatures climb to a more comfortable 8°C (48°F) during the day. Despite this gradual rise, highs remain steady at 23°C (73°F), mirroring the patterns of preceding months. The trend of increasingly mild days continues, making September an inviting time for exploration and photography, as the dramatic landscapes of Uyuni become increasingly vibrant with the change in seasons. Overall, visitors can expect a refreshing yet manageable climate, perfect for experiencing the breathtaking beauty of this unique destination.
In September, Uyuni, Bolivia, experiences a notable shift in its precipitation patterns as the dry winter months give way to slightly increased rainfall. With 8 mm (0.3 inches) of precipitation falling over just one day, September acts as a gentle precursor to the wetter months ahead. This modest uptick in rainfall marks a transition from the almost entirely dry spell of previous months—where July and August recorded negligible precipitation—to the onset of more frequent rain in October and November. As the desert landscape begins to awaken, September’s rainfall hints at the lushness that will soon blanket the region, creating a captivating interplay between the arid environment and the arrival of moisture.
In September, Uyuni, Bolivia experiences a notable shift in humidity, rising to 60% after the dry months of July and August, which see levels plummet to an incredibly low 43%. This increase marks a transition as the region prepares to embrace the upcoming rainy season. It's fascinating to witness this contrast, moving from the dry, crisp air of winter into a more humid environment that's characteristic of the spring months. As October approaches, humidity continues to climb, hinting at the lush transformations that will soon envelop the landscape. This variability not only impacts the local climate but also adds to the unique charm of Uyuni throughout the year.
In September, Uyuni, Bolivia, experiences a UV Index of 16, placing it in the extreme exposure category with a burn time of just 10 minutes. This month continues the trend seen earlier in the year, maintaining high UV levels alongside January, February, and October, which all recorded an extreme index of 19. While there's a slight dip from August’s Index of 13, September’s values still demand caution for sun exposure. As the year progresses, it's essential to remain vigilant about UV protection, especially during these intense months. For more detailed insights, visit Uyuni UV Index.
UV Risk Categories
As the months transition towards the end of the year, September in Uyuni, Bolivia, shines brightly with an impressive 348 hours of sunshine, matching the abundance of the previous month. This period marks the culmination of a remarkable upward trend, as daylight hours steadily increase from January's 294 hours to October's peak of 376 hours. The consistent sunshine not only bathes the stunning salt flats in radiant light but also signals the onset of the more vibrant and sun-drenched months ahead. With each passing month, the intensity of the Bolivian sun creates an ideal backdrop for exploring the surreal landscapes and breathtaking vistas that Uyuni is renowned for.
In September, Uyuni, Bolivia, enjoys a 70% chance of sunny weather, reflecting the lingering warmth of the dry season that reaches its peak in the preceding months. Following a steady climb from 36% in January to 89% in July, the likelihood of sunshine remains favorable through August and into September, making it an ideal time for outdoor adventures. As autumn approaches, the sun begins to retreat slightly, leading into a vibrant October with an 84% chance of clear skies. This trend highlights September as a transitional month, where travelers can still relish the last vestiges of sunny days before the weather shifts dramatically towards the wetter season in the following months.
In September, Uyuni experiences 11 hours of daylight, maintaining the same duration as the previous months of July and August. This steady daylight pattern reflects the gradual transition towards the longer days of October and November, when daylight will extend to 12 hours and then peak at 13 hours by the end of the year. The notable progression from the longer daylight hours in January, tapering down to 10 hours in June before starting to rebound, illustrates the region's seasonal shifts. As the days lengthen once again, the vibrant landscapes of Uyuni will bask in the nourishing light, inviting adventurers to explore its surreal beauty.
In September, the winds in Uyuni, Bolivia pick up a notch, with an average speed of 3.7 m/s (or 8 mph), mirroring the breezy patterns observed in the late winter months. As the region transitions into spring, September's winds show a slight increase from August's 3.8 m/s, suggesting a shift in the atmosphere as it prepares for the warmer days ahead. This month marks a pivotal point, not only maintaining a steady wind speed but also serving as a precursor to October, when gusts reach their peak at 4.3 m/s (10 mph). The gradual escalation of wind speeds through these months is a testament to Uyuni’s dynamic climate, inviting adventurous spirits to experience the unique landscapes shaped by these seasonal breezes.
Weather in Uyuni varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Uyuni, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather patterns. In September, temperatures range from a chilly minimum of -5°C (23°F) to a pleasant maximum of 23°C (73°F), with an average temperature of 8°C (48°F). This month experiences minimal precipitation, only about 8 mm (0.3 in) across just one day and a moderate humidity level of 60%. In stark contrast, January sees a more stable temperature range with a minimum of 0°C (32°F) and an average of 11°C (53°F), reaching the same maximum of 23°C (73°F). However, January is significantly wetter, with 104 mm (4.1 in) of rainfall spread over 15 days, accompanied by higher humidity at 87%. For more details about January weather patterns, you can visit Uyuni weather in January.
September and February present strikingly different weather characteristics. In September, temperatures range from a chilly minimum of -5°C (23°F) to a comfortable maximum of 23°C (73°F), with an average of 8°C (48°F). The month sees minimal precipitation, with just 8 mm (0.3 in) over a single day, and a moderate humidity level of 60%. In contrast, February offers a milder climate with a minimum of 1°C (33°F) and a maximum of 24°C (76°F), averaging 12°C (53°F). However, it experiences significantly higher rainfall, with 103 mm (4.1 in) spread over 16 days and a higher humidity of 88%. For a closer look at the February climate, check out Uyuni weather in February.
In September, the weather in Uyuni is relatively mild, with temperatures ranging from a crisp -5°C (23°F) at night to a comfortable 23°C (73°F) during the day, making it a pleasant time for outdoor activities. The month typically sees low precipitation, averaging just 8 mm (0.3 in) over about one day, and the humidity sits at a moderate 60%. In contrast, March brings slightly warmer temperatures, with a minimum of 0°C (32°F) and an average of 11°C (52°F). However, this month is much wetter, with total precipitation reaching 74 mm (2.9 in) across 14 days, leading to a significantly higher humidity level of 89%. For more details, you can visit Uyuni weather in March.
In comparing the weather between September and April, we find some similarities as well as notable differences. Both months experience a temperature range with minimums around -5°C (23°F), while September boasts an average temperature of 8°C (48°F) and a maximum of 23°C (73°F), closely mirroring April's average of 9°C (49°F) and maximum of 23°C (74°F). However, September tends to be drier, with only 8 mm (0.3 in) of precipitation over just 1 day, compared to April's 11 mm (0.4 in) of rain spread across 3 days. Additionally, the humidity is significantly higher in April at 87%, compared to 60% in September. For more detailed insights, you can check Uyuni weather in April.
When comparing the weather in September and May, notable differences emerge in temperature and humidity. In September, temperatures range from a minimum of -5°C (23°F) to a maximum of 23°C (73°F), with an average of 8°C (48°F) and relatively low precipitation of 8 mm over just 1 day. In contrast, May presents cooler temperatures, with a minimum of -6°C (22°F) and a maximum of 20°C (69°F), averaging at 6°C (43°F). Moreover, May experiences almost negligible rainfall of just 1 mm and no rainy days, but it is characterized by higher humidity at 82% compared to September's 60%. For a closer look at the weather conditions in May, you can visit Uyuni weather in May.
In comparing the weather of September and June, we observe notable differences in temperatures and precipitation. September sees a broader temperature range with a minimum of -5°C (23°F), an average of 8°C (48°F), and a maximum of 23°C (73°F), while June has a slightly cooler spectrum, ranging from a minimum of -8°C (17°F) to a maximum of 17°C (63°F), with an average temperature of just 4°C (39°F). Additionally, September experiences minimal precipitation at 8 mm (0.3 in) over just one day, whereas June is exceptionally dry, recording only 1 mm (0.0 in) across the entire month without any rainy days, making it one of the driest times of the year. Overall, September is generally warmer and wetter compared to the cooler, drier conditions of June. For a closer look at June weather specifics, refer to Uyuni weather in June.
In comparing the weather between September and July, September offers a milder climate with average temperatures reaching 8°C (48°F) and highs of 23°C (73°F), while July features cooler conditions, averaging just 4°C (40°F) and peaking at 17°C (63°F). Additionally, September sees slightly more precipitation, with 8 mm (0.3 in) over one day, compared to July's 4 mm (0.2 in) also over a single day. Humidity levels are also higher in September at 60%, compared to the cooler July, which has a humidity of 47%. For more details on July weather, you can check Uyuni weather in July.
In comparing the weather between August and September, it's evident that September offers milder conditions, with average temperatures rising to 8°C (48°F) compared to August's average of 5°C (41°F). The maximum temperatures also increase, reaching 23°C (73°F) in September, contrasted with August's peak of 19°C (67°F). Additionally, September experiences slightly higher humidity at 60%, while August has a lower humidity level of 43%. Precipitation is minimal in both months, but September sees a single day of light rainfall totaling 8 mm (0.3 in), whereas August remains completely dry with only 2 mm (0.1 in) of precipitation reported. For a more detailed look at August weather, you can visit Uyuni weather in August.
In September, the weather exhibits a notable range with minimum temperatures dipping to -5°C (23°F) and averaging around 8°C (48°F), while maximum temperatures reach a comfortable 23°C (73°F). There is minimal precipitation, with only 8 mm (0.3 in) occurring over just one day, and humidity levels sit at 60%.
October, on the other hand, sees a slight increase in average temperatures to 11°C (52°F) while maintaining the same maximum of 23°C (74°F). Precipitation increases to 11 mm (0.4 in) over two days, suggesting a shift toward slightly wetter conditions. Additionally, humidity rises to 67%, contributing to a feeling of increased moisture in the air. For more detailed information, you can check Uyuni weather in October.
September and November present differing weather experiences as we transition into autumn. In September, temperatures range from a chilly minimum of -5°C (23°F) to an average of 8°C (48°F), peaking at a maximum of 23°C (73°F). The month sees minimal precipitation, with only 8 mm (0.3 in) over a single day, and humidity levels at a comfortable 60%.
In contrast, November offers slightly milder conditions, with temperatures ranging from a minimum of -4°C (26°F), an average of 12°C (54°F), and a maximum of 25°C (77°F). However, it brings a noticeable increase in precipitation, totaling 16 mm (0.6 in) spread over five days, alongside a rise in humidity to 71%. For a detailed look at November weather, you can check Uyuni weather in November.
In September, the weather in Uyuni features a range of temperatures from a chilly -5°C (23°F) at night to a comfortable high of 23°C (73°F) during the day, with an average temperature of 8°C (48°F). The month experiences relatively low precipitation, with only 8 mm (0.3 in) of rain recorded over a single day, and humidity levels hovering around 60%.
In contrast, December brings a milder climate with temperatures ranging from -3°C (27°F) to a warm 25°C (78°F), presenting an average of 13°C (55°F). However, it also sees significantly higher precipitation levels, totaling 90 mm (3.5 in) over 13 days, and increased humidity at 79%. For a more detailed look at why December might be a wetter month, check out Uyuni weather in December.
September in Uyuni stands out as a month of transition, where the chill of winter begins to wane and warm days start to emerge. With mild temperatures averaging around 8°C, the air feels refreshing, yet the crispness of the nights still reminds you of the colder months. Unlike the heavy rains of the summer, September enjoys minimal precipitation, with just a single rainy day contributing to the desert's overall dryness. This combination of pleasant daytime warmth and cool nights, alongside moderate humidity, creates an ideal environment for exploring the stunning landscapes around Uyuni. For more insights into how September weather fits into the broader climate patterns, check out Uyuni Climate.