Last updated: August 21, 2025
September in Tarija, Bolivia marks a transitional period characterized by dynamic weather patterns. With maximum temperatures peaking at 30°C (86°F) and a cool average of 13°C (56°F), residents and visitors can enjoy pleasant days that turn crisp at night. The region experiences a minimum temperature that can dip to -2°C (29°F), so layering is advisable. Precipitation is relatively moderate, with approximately 42 mm (1.7 in) of rain falling over 9 days, contributing to a humidity level of 42% that adds a touch of freshness to the air. Overall, September showcases Tarija's moderate climate, making it an ideal time for outdoor exploration and enjoying the stunning landscapes.
In September, Tarija transitions from the brisk chill of winter to the inviting warmth of spring, with temperatures gradually rising. The minimum temperature hovers around -2°C (29°F), signalling the last whispers of winter, while daytime averages reach a comfortable 13°C (56°F). This month marks a notable peak in warmth as the maximum temperature can soar to 30°C (86°F), making it one of the warmer periods of the year. The increasing temperatures serve as a harbinger of the vibrant landscape that will flourish in the months to come, inviting visitors to explore the rich culture and scenic beauty of this Bolivian gem. With each passing day, the shift from cool to warm is palpable, making September an ideal time to experience Tarija's delightful climate.
In September, Tarija experiences a slight uptick in precipitation, receiving 42 mm (1.7 in) of rain over 9 days. This marks a transition from the drier months of July and August, where rainfall dipped significantly to just a few millimeters. The increase indicates the beginning of a more robust rainy season, as the region moves towards October and November, which are known for heavier rains. Notably, September serves as a bridge, introducing a gradual rise in both the amount of rainfall and rainy days, setting the stage for the lush greenery that follows.
In September, Tarija experiences a slight increase in humidity, reaching 42% after the notably dry months of July and August, where humidity plummeted to 49% and 33%, respectively. This transition marks the beginning of a gradual ascent in moisture levels, which continues into the more humid months of October and November, peaking at 78%. The shift from the arid summer months creates a refreshing change, hinting at the onset of the wet season. Overall, September serves as a bridge, blending the lingering dryness with the upcoming humid atmosphere that characterizes the latter part of the year.
In September, Tarija, Bolivia, experiences a UV Index of 14, categorizing it as extreme with a burn time of just 10 minutes for unprotected skin. This uptick follows a summer pattern, where the UV Index is notably higher from January to March, peaking at 17 during the early months. Although slightly lower than the peak summer months, September continues to demand caution as it maintains the extreme exposure category. The trend highlights the consistent intensity of ultraviolet radiation in the region, making it crucial for residents and visitors alike to stay vigilant about sun protection. For more details, visit Tarija UV Index.
UV Risk Categories
September in Tarija, Bolivia, is a treasure trove of sunshine, boasting 322 hours of radiant light. As autumn transitions in the Southern Hemisphere, the city's daylight hours reflect a delightful consistency, slightly dipping from the sun-kissed peaks of August's 330 hours. This subtle decrease is part of a broader trend where autumn days begin to wane, yet September still offers plenty of warmth as locals bask in its glow. Following the vibrant summer months, where May and July both shone with 318 and 319 hours respectively, September provides a comfortable balance of daylight, preparing the way for the longer hours of October, which tops the charts at 339 hours. Whether exploring vineyards or enjoying the picturesque landscapes, September's sunlight in Tarija invites both adventure and relaxation.
As September rolls into Tarija, Bolivia, the likelihood of sunny weather presents a notable transition from the preceding months. With a 48% chance of sunshine, this time of year marks a shift from the summer months of July and August, which boast significantly higher probabilities of clear skies at 69% and 71%, respectively. While September offers a more moderate outlook, it's still a strong contender compared to the gloomier months that follow, such as November and December, where the chances of sun drop to 19% and 17%. Thus, if you’re planning a visit to Tarija in September, you can expect a refreshing mix of delightful sunshine interspersed with the charm of early spring.
In September, Tarija, Bolivia experiences approximately 11 hours of daylight, a consistent duration that mirrors the latter part of winter and the transition into spring. This month marks a subtle shift as the days gradually lengthen, paralleling patterns seen in both April and May, which also showcase 11 hours of daylight. Following a summer peak in January with a full 13 hours, the daylight duration aligns into a rhythm, with a slight ebb during the winter months of June and July. As autumn approaches, this steady pattern hints at the promise of longer days ahead, culminating in the return to 12 hours in October and potentially rising again towards the summer solstice in December. Overall, September serves as a pivotal moment, bridging the shorter days of winter with the light-filled months to come.
As September dawns in Tarija, Bolivia, the atmosphere begins to shift, heralding the arrival of slightly brisker winds. With an average wind speed of 2.1 m/s (5 mph), the month marks a peak that stands alongside the summer months of June and August. Notably, this trend of increasing wind speeds becomes more pronounced as the year progresses from the calmer earlier months of January through May, where the winds barely stirred at around 1.7 to 1.9 m/s (4 mph). This gradual acceleration culminates in October's anticipated rise to 2.2 m/s (5 mph), suggesting that the gentle breezes of late winter give way to a spirited gust as spring approaches. Overall, September captures a moment of transition, where the winds carry the promise of change, inviting residents and visitors alike to embrace the refreshing sensations of the season.
Weather in Tarija varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Tarija, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather experiences a wider temperature range, with minimums dropping as low as -2°C (29°F) and maximums reaching up to 30°C (86°F), resulting in an average of 13°C (56°F). This month sees relatively low humidity at 42% and a total precipitation of 42 mm (1.7 in) over 9 days. In contrast, January presents milder temperatures, where the minimums are higher at 7°C (45°F) and the averages are around 16°C (61°F), peaking at 27°C (80°F). However, it also has significantly more rainfall, with 174 mm (6.9 in) across 20 days and increased humidity at 87%. For a detailed look at January weather, visit Tarija weather in January.
In comparing the weather between September and February, notable differences emerge. September experiences a wider temperature range, with a minimum of -2°C (29°F) and a maximum reaching 30°C (86°F), resulting in an average temperature of 13°C (56°F). In contrast, February is milder with temperatures ranging from a minimum of 8°C (46°F) to a maximum of 28°C (83°F) and a slightly higher average of 15°C (59°F). However, February is significantly wetter, with precipitation totaling 207 mm (8.1 in) over 23 days, compared to September's 42 mm (1.7 in) over just 9 days. Additionally, February's humidity is much higher at 81%, compared to September's 42%. For more details on February weather, check out Tarija weather in February.
September and March present contrasting weather conditions. September experiences a wider temperature range, with minimums dipping to -2°C (29°F) at night but peaking at a warm 30°C (86°F) during the day, averaging around 13°C (56°F). This month sees relatively low precipitation of 42 mm (1.7 in) over about 9 days, accompanied by a comfortable humidity level of 42%.
In contrast, March tends to be milder overall, with minimum temperatures starting at 6°C (42°F) and an average high of 29°C (84°F), averaging 15°C (59°F). However, it is much wetter, with precipitation reaching 176 mm (6.9 in) spread across 23 days, resulting in significantly higher humidity at 78%.
For more information on March weather, you can visit Tarija weather in March.
September and April exhibit distinct weather patterns, reflecting the transition from late winter to early spring in Tarija. In September, temperatures can range from a chilly -2°C (29°F) at night to a warm 30°C (86°F) during the day, with an average temperature of around 13°C (56°F). This month sees relatively low precipitation, averaging 42 mm (1.7 in) over about 9 days, and a comfortable humidity of 42%.
In contrast, April brings slightly milder nighttime temperatures with a minimum of 2°C (36°F) and an average daily temperature of 14°C (57°F). The maximum can reach 28°C (82°F), but the month is typically wetter, receiving 74 mm (2.9 in) of rain over approximately 15 days, coupled with higher humidity levels at 82%. For more details on what to expect, check out Tarija weather in April.
September and May exhibit notable differences in weather conditions. September enjoys a wider temperature range with minimums dropping to -2°C (29°F) and maximums reaching up to 30°C (86°F), while the average temperature is around 13°C (56°F). In contrast, May has slightly milder temperatures, with minimums also at -2°C (28°F) but maximums capping at 26°C (80°F) and an average around 11°C (53°F).
Precipitation levels are higher in September, with 42 mm (1.7 in) over 9 days compared to May's 27 mm (1.1 in) across the same number of days. Additionally, May is marked by significantly higher humidity at 82%, whereas September's humidity sits at 42%. For a closer look at what to expect during May, check out Tarija weather in May.
In September, the weather tends to be warmer than in June, with average temperatures reaching 13°C (56°F) compared to June's 10°C (51°F). September also experiences higher maximum temperatures, peaking at 30°C (86°F), while June's maximum is slightly lower at 28°C (83°F). Additionally, September has more precipitation, approximately 42 mm (1.7 in) spread over 9 days, whereas June is much drier with only 10 mm (0.4 in) over 3 days. Humidity levels are notably higher in June at 69%, compared to September's 42%. For a more detailed look into June weather, you can visit Tarija weather in June.
September's weather contrasts with July's in several notable ways. In September, temperatures range from a chilly minimum of -2°C (29°F) to a pleasantly warm maximum of 30°C (86°F), with an average of 13°C (56°F). This month also experiences higher humidity at 42% and more precipitation, totaling 42 mm (1.7 inches) over 9 days. In comparison, July has lower overall temperatures, with a minimum of -7°C (19°F) and a maximum of 26°C (80°F), alongside an average temperature of just 10°C (50°F). Rainfall in July is significantly less, at only 14 mm (0.6 inches) over just 3 days, and humidity is slightly higher at 49%. For more details, you can check Tarija weather in July.
In comparing the weather between August and September, we can observe noticeable differences. September experiences a broader temperature range with a minimum of -2°C (29°F), an average of 13°C (56°F), and a maximum of 30°C (86°F), whereas August has lower temperatures, ranging from a minimum of -6°C (21°F) to a maximum of 27°C (81°F). Additionally, September sees increased precipitation at 42 mm (1.7 in) over 9 days, compared to August's relatively dry conditions with only 12 mm (0.5 in) over 4 days. Furthermore, the humidity levels rise from 33% in August to 42% in September, contributing to a noticeably more humid atmosphere. For more details on August's weather specifics, you can check Tarija weather in August.
September and October weather present a notable shift in conditions. In September, temperatures can range from a chilly -2°C (29°F) at night to a warm 30°C (86°F) during the day, with an average of 13°C (56°F). Precipitation during this month averages 42 mm (1.7 in) over approximately 9 days, while humidity sits at a comfortable 42%.
As October arrives, the weather becomes slightly milder with minimum temperatures rising to 0°C (33°F) and a higher average of 15°C (59°F), while still reaching highs of 30°C (86°F). However, the month sees an increase in rainfall, with 67 mm (2.6 in) of precipitation occurring over 16 days, and humidity levels rising to 49%. This shift in weather is reflected in the changing climate patterns during this period. For more detailed information, you can visit Tarija weather in October.
September and November showcase notable differences in weather patterns. In September, temperatures range from a chilly -2°C (29°F) at night to a warm 30°C (86°F) during the day, with an average of 13°C (56°F). The month experiences relatively low precipitation, totaling 42 mm (1.7 in) over just 9 days, and a humidity level of 42%. In contrast, November sees milder temperatures, with minimums of 5°C (41°F) and maximums of 27°C (82°F), averaging at 15°C (60°F). However, it also brings significantly higher rainfall, with 126 mm (5.0 in) spread across 20 days and a rising humidity level of 78%. For more detailed information on the weather in November, you can check Tarija weather in November.
September and December present contrasting weather patterns. In September, temperatures vary significantly, with a minimum of -2°C and a maximum of 30°C, resulting in an average of 13°C. The month experiences relatively low precipitation of 42 mm over 9 days and maintains a humidity level of 42%. In contrast, December offers milder temperatures, ranging from a minimum of 7°C to a maximum of 28°C, with an average temperature of 15°C. However, it is considerably wetter, with 238 mm of precipitation spread across 25 days and high humidity at 87%. For a detailed overview of December weather, you can visit Tarija weather in December.
As September rolls into Tarija, the weather begins to shift in a delightful way. With daytime temperatures reaching a pleasant 30°C (86°F) and cooler nights averaging around 13°C (56°F), this month offers a refreshing contrast to the colder winter months. Although the mercury can dip as low as -2°C (29°F), the overall climate is markedly more inviting, making it ideal for outdoor activities. However, this transitional period also brings some rain, with about 42 mm (1.7 in) of precipitation spread across 9 days, which is a noticeable increase compared to the drier months prior. The humidity remains relatively low at 42%, creating a comfortable atmosphere. To learn more about how September fits into the larger pattern of Tarija's weather, visit Tarija Climate.